Corbon and its Compounds Online Test 10th Science Lesson 11 Questions in English

Corbon and its Compounds Online Test 10th Science Lesson 11 Questions in English

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Question 1
In which of the following carbon element is incorporated?
  1. Food we eat
  2. Medicines we take when ill
  3. Domestic and automobile fuels
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 1 Explanation: 
Carbon is an inseparable element in human life as we use innumerable number of carbon compounds in our day-to-day life. Because, the food we eat, medicines we take when ill, clothes we wear; domestic and automobile fuels, paint, cosmetics, automobile parts, etc., that we use contain carbon compounds.
Question 2
Which of the following is not a unique feature of carbon?
  1. Catenation
  2. Tetravalency
  3. Multiple bonding
A
1, 2
B
1, 3
C
2, 3
D
None
Question 2 Explanation: 
The unique nature of carbon, such as catenation, tetravalency and multiple bonding, enables it to combine with itself or other elements like hydrogen, oxygen, nitrogen, sulphur etc., and hence form large number of compounds. All these compounds are made of covalent bonds. These compounds are called organic compounds.
Question 3
  • Assertion(A): The number of carbon compounds found in nature and man-made, is much higher  than that of any other element in the periodic table
  • Reason(R): In-fact there are more than 5 million compounds of carbon.
A
Both (A) and (R) are correct, but (R) does not explain (A)
B
Both (A) and (R) are wrong
C
Both (A) and (R) are correct and (R) explains (A)
D
(A) is Correct and (R) is wrong
Question 3 Explanation: 
The number of carbon compounds found in nature and man-made, is much higher than that of any other element in the periodic table. In-fact there are more than 5 million compounds of carbon.
Question 4
Which of the following are the characteristics of Organic compounds?
  1. Organic compounds have a high molecular weight and a complex structure
  2. They are highly inflammable in nature
  3. They are non-volatile in nature.
A
1, 2
B
1, 3
C
2, 3
D
None
Question 4 Explanation: 
Organic compounds have a high molecular weight and a complex structure. They are highly inflammable in nature. They are volatile in nature. Organic compounds can be prepared in the laboratory.
Question 5
  • Assertion(A): The reactions involving organic compounds proceed at slower rates
  • Reason(R): Organic compounds are less reactive compared to inorganic compounds
A
Both (A) and (R) are correct, but (R) does not explain (A)
B
Both (A) and (R) are wrong
C
Both (A) and (R) are correct and (R) explains (A)
D
(A) is Correct and (R) is wrong
Question 5 Explanation: 
Organic compounds are less reactive compared to inorganic compounds. Hence, the reactions involving organic compounds proceed at slower rates.
Question 6
In which of the following organic compounds are insoluble?
A
Water
B
Toluene
C
Ether
D
carbon tetrachloride
Question 6 Explanation: 
Organic compounds are mostly insoluble in water, but soluble in organic solvents such as ether, carbon tetrachloride, toluene, etc.
Question 7
Which of the following statement is correct about isomerism?
A
A single molecular formula represents several organic compounds that differ in their physical and chemical properties
B
A single molecular formula represents several organic compounds that differ in their physical property alone
C
A single molecular formula represents several organic compounds that differ in their chemical properties alone
D
None
Question 7 Explanation: 
Organic compounds exhibit the phenomenon of isomerism, in which a single molecular formula represents several organic compounds that differ in their physical and chemical properties. They have lower melting point and boiling point when compared to inorganic compounds.
Question 8
Which of the following statement is correct?
  1. There are millions of organic compounds known and many new organic compounds are discovered every year in nature or synthesized in laboratory
  2. In early days, chemists recognised that compounds having similar structural features have identical chemical properties
A
1 alone
B
2 alone
C
1, 2
D
None
Question 8 Explanation: 
There are millions of organic compounds known and many new organic compounds are discovered every year in nature or synthesized in laboratory. This may mystify organic chemistry to a large extent. However, a unique molecular structure can be assigned to each compound and it can be listed by using systematic methods of classification and eventually named on the basis of its structural arrangements. In early days, chemists recognised that compounds having similar structural features have identical chemical properties. So, they began to classify compounds based on the common structural arrangements found among them.
Question 9
Which of the following statement is correct?
  1. Organic chemistry is the chemistry of catenated carbon compounds.
  2. The carbon atoms present in organic compounds are linked with each other through inter- molecular force and thus exist as chains.
A
1 alone
B
2 alone
C
1, 2
D
None
Question 9 Explanation: 
Organic chemistry is the chemistry of catenated carbon compounds. The carbon atoms present in organic compounds are linked with each other through covalent bonds and thus exist as chains.
Question 10
A compound have triple bonds between them, then it is_______
A
Unsaturated
B
Saturated
C
Partially saturated
D
None
Question 10 Explanation: 
If one or more double bonds or triple bonds exist between the carbon atoms, then the compound is said to unsaturated.
Question 11
In Open chain compounds Carbon atoms are linked in a________
A
Cyclic pattern
B
Linear pattern
C
Rectangular pattern
D
Square pattern
Question 11 Explanation: 
Acyclic or Open chain compounds: These are the compounds in which the carbon atoms are linked in a linear pattern to form the chain. If all the carbon atoms in the chain are connected by single bonds, the compound is called as saturated.
Question 12
CH3-CH=CH2, what is the name of the compound?
A
Propane
B
Propene
C
Propyne
D
None
Question 13
Which of the following is a carbocyclic compound?
A
Cyclo-butanol
B
Furanol
C
Benzene
D
Benzenol
Question 13 Explanation: 
Organic compounds in which the chain of carbon atoms is closed or cyclic are called cyclic compounds. If the chain contains only carbon atoms, such compounds are called carbocyclic compounds. e.g. Benzene, Furan.
Question 14
Which of the following compounds presence makes heterocyclic compounds?
  1. Oxygen
  2. Nitrogen
  3. Sulphur
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 14 Explanation: 
If the chain contains carbon and other atoms like oxygen, nitrogen, sulphur, etc., these compounds are called heterocyclic compounds.
Question 15
Which of the following statement is correct?
  1. Carbocyclic compounds are further subdivided into alicyclic and aromatic compounds.
  2. Alicyclic compounds contain one or more carbocyclic rings which may be saturated or unsaturated
  3. Aromatic compounds contain one or more benzene rings
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 15 Explanation: 
Carbocyclic compounds are further subdivided into alicyclic and aromatic compounds. Alicyclic compounds contain one or more carbocyclic rings which may be saturated or unsaturated whereas aromatic compounds contain one or more benzene rings (ring containing alternate double bonds between carbon atoms).
Question 16
Match the following:
  1. Saturated carbon atom                     1. Cyclo-butane
  2. Unsaturated Compound                  2. Ethene
  3. Heterocyclic Compound                 3. Ethane
  4. Alicyclic Compounds                     4. Pyridine
A
2, 1, 3, 4
B
3, 2, 4, 1
C
2, 1, 3, 4
D
1, 2, 4, 3
Question 17
The organic compounds that are composed of only carbon and hydrogen atoms are called_______
A
Carbo-Hydroxide
B
Hydro-carbon
C
Methyl Carbide
D
None
Question 17 Explanation: 
Other than carbon, organic compounds contain atoms like hydrogen, oxygen, nitrogen, etc., bonded to the carbon. The organic compounds that are composed of only carbon and hydrogen atoms are called hydrocarbons.
Question 18
Which of the following statement is correct?
  1. The carbon atoms join together to form the framework of the compounds.
  2. These are regarded as the parent organic compounds and all other compounds are considered to be derived from hydrocarbons by replacing one or more hydrogen atoms with other atoms or group of atoms
A
1 alone
B
2 alone
C
1, 2
D
None
Question 18 Explanation: 
The carbon atoms join together to form the framework of the compounds. These are regarded as the parent organic compounds and all other compounds are considered to be derived from hydrocarbons by replacing one or more hydrogen atoms with other atoms or group of atoms.
Question 19
Which of the following statement is correct?
  1. Alkanes are hydrocarbons, which contain only single bonds
  2. The simplest alkane (for n=1) is methane (CH4).
  3. They are represented by the general formula Cn H2n
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 19 Explanation: 
Alkanes are hydrocarbons, which contain only single bonds. They are represented by the general formula CnH2n + 2 (where n = 1,2, 3, ……). The simplest alkane (for n=1) is methane (CH4). Since, all are single bonds in alkanes, they are saturated compounds.
Question 20
Which of the following statement is correct?
  1. The hydrocarbons, which contain one or more C=C bonds are called alkenes
  2. These are unsaturated compounds
  3. They are represented by the general formula CnH2n
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 20 Explanation: 
The hydrocarbons, which contain one or more C=C bonds are called alkenes. These are unsaturated compounds. They are represented by the general formula CnH2n. The simplest alkene contains two carbon atoms (n=2) and is called ethylene (C2H4).
Question 21
______is the simplest alkyne, which contains two carbon atoms
A
Ethane
B
Ethene
C
Acetylene
D
None
Question 21 Explanation: 
The hydrocarbons containing c to c triple bond are called alkynes. They are also unsaturated as they contain triple bond between carbon atoms. They have the general formula CnH2n – 2. Acetylene (C2H2) is the simplest alkyne, which contains two carbon atoms.
Question 22
Match the following
  1. Ethane                   1. C5H8
  2. Propene               2. C3H6
  3. Propyne               3. C3H4
  4. Pentyne                  4. C2H6
A
2, 1, 3, 4
B
3, 2, 4, 1
C
4, 2, 3, 1
D
1, 2, 4, 3
Question 23
Which of the following are Characteristics of hydrocarbons?
  1. They are colourless and odourless
  2. They undergo combustion reaction with oxygen to form CO2 and water.
  3. They are soluble in water
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 23 Explanation: 
Characteristics of hydrocarbons: They are colourless and odourless They undergo combustion reaction with oxygen to form CO2 and water. Alkanes are saturated whereas alkenes and alkynes are unsaturated. They are insoluble in water.
Question 24
The boiling point of hydrocarbons______
A
Increases with an increase in the number of carbon atoms
B
Increases with a decrease in the number of carbon atoms
C
Decreases with an increase in the number of carbon atoms
D
No changes
Question 24 Explanation: 
The boiling point of hydrocarbons increases with an increase in the number of carbon atoms. They undergo combustion reaction with oxygen to form CO2 and water.
Question 25
Which of the following are gases at room temperature?
A
Methane
B
Ethane
C
Octane
D
Both 1 and 2
Question 25 Explanation: 
Lower hydrocarbons are gases at room temperature e.g methane, ethane are gases. Alkynes are the most reactive due to the presence of the triple bond.
Question 26
Which of the following is a test to identify saturated and unsaturated compounds?
A
Blue litmus
B
Red litmus
C
Bromine water test
D
Saline water test
Question 26 Explanation: 
Identify saturated and unsaturated compounds: Take the given sample solution in a test tube Add a few drops of bromine water and observe any characteristic change in colour If the given compound is unsaturated, it will decolourise bromine water. Saturated compounds do not decolourise bromine
Question 27
Which of the following does not decolourise bromine water?
A
Alkane
B
Alkyne
C
Alkene
D
All the above
Question 28
Which of the following statement is correct?
  1. The structural frameworks of organic compounds are made of carbon and hydrogen, which are relatively less reactive
  2. The presence of some other atoms or group of atoms makes the compounds more reactive and thus determines the chemical properties of the compound.
A
1 alone
B
2 alone
C
1, 2
D
None
Question 28 Explanation: 
The structural frameworks of organic compounds are made of carbon and hydrogen, which are relatively less reactive. But, the presence of some other atoms or group of atoms makes the compounds more reactive and thus determines the chemical properties of the compound. These groups are called functional groups.
Question 29
Which of the following statement is correct?
  1. The chemical properties of an organic compound depend on its functional group
  2. The physical properties rely on remaining part of the structure
  3. For example, ethane is a hydrocarbon having molecular formula C2H6. If one of its hydrogen is replaced by –OH group, you will get an alcohol.
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 29 Explanation: 
The chemical properties of an organic compound depend on its functional group whereas its physical properties rely on remaining part of the structure. Carbon to carbon multiple bonds (C=C, C C) also are considered as functional groups as many of the properties are influenced by these bonds. Other functional groups include atoms of halogens, –OH, –CHO, –COOH, etc. For example, ethane is a hydrocarbon having molecular formula C2H6. If one of its hydrogen is replaced by –OH group, you will get an alcohol.
Question 30
A series of compounds containing the same functional group is called a_____
A
Group of organic compounds
B
Class of organic compounds
C
Order of organic compounds
D
None
Question 30 Explanation: 
A series of compounds containing the same functional group is called a class of organic compounds. Leaving the functional group, the rest of the structure is represented by ‘R’. Thus, an alcohol is represented by ‘R-OH’.
Question 31
Match the following:
  1. Acetaldehyde                     1. CH3COCH3
  2. Acetone                              2. CH3CHO
  3. Methyl acetate                    3. CH3OCH3
  4. Dimethyl ether                   4. CH3COOCH3
A
2, 1, 3, 4
B
3, 2, 4, 1
C
2, 3, 4, 1
D
1, 2, 4, 3
Question 32
Which of the following statement is correct?
  1. Homologous series is a group or a class of organic compounds having same general formula
  2. They have similar chemical properties in which the successive members differ by a - CH2 group
A
1 alone
B
2 alone
C
1, 2
D
None
Question 32 Explanation: 
Homologous series is a group or a class of organic compounds having same general formula and similar chemical properties in which the successive members differ by a - CH2 group
Question 33
Match the following:
  1. Methane                          1. CH3(CH2)3CH3
  2. Propane                             2. CH4
  3. Pentane                              3. CH3(CH2)2CH3
  4. Butane                               4. CH3CH2CH3
A
2, 1, 3, 4
B
2, 4, 3, 1
C
2, 3, 4, 1
D
1, 2, 4, 3
Question 34
What is the difference in molecular mass of preceding or succeeding member by one methylene group?
A
24 amu
B
14 amu
C
10 amu
D
9 amu
Question 34 Explanation: 
Each member of the homologous series differs from the preceding or succeeding member by one methylene group (–CH2) and hence by a molecular mass of 14 amu.
Question 35
Which of the following statement about homologous series is correct?
  1. All members of a homologous series contain the same elements and functional group
  2. Chemical properties of the members of a homologous series are similar.
  3. All the members can be prepared by a common method.
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 35 Explanation: 
All members of a homologous series contain the same elements and functional group. They are represented by a general molecular formula. e.g. Alkanes, CnH2n + 2. The members in each homologous series show a regular gradation in their physical properties with respect to their increase in molecular mass. Chemical properties of the members of a homologous series are similar All the members can be prepared by a common method.
Question 36
What is the Latin name of the red ant?
A
Erica
B
Formica
C
Calcite
D
Formalin
Question 36 Explanation: 
In ancient days, the names of organic compounds were related to the natural things from which they were obtained. For example, the formic acid was initially obtained by distillation of ‘red ants’. Latin name of the red ant is ‘Formica’. So, the name of the formic acid was derived from the Latin name of its source Later, the organic compounds were synthesized from sources other than the natural sources.
Question 37
What is the full-form of IUPAC?
A
International Union of Physical and Applied Chemistry
B
International Union of Pure and Organic Chemistry
C
International Union of Pure and Applied Chemistry
D
International Union of Physical and Applied Physics
Question 37 Explanation: 
Scientists framed a systematic method for naming the organic compounds based on their structures. Hence, a set of rules was formulated by IUPAC (International Union of Pure and Applied Chemistry) for the nomenclature of chemical compounds.
Question 38
The IUPAC name of the any organic compound consists of_____ parts
A
5
B
3
C
6
D
2
Question 38 Explanation: 
The IUPAC name of the any organic compound consists of three parts: Root word Prefix Suffix These parts are combined as per the following sequence to get the IUPAC name of the compound:
Question 39
Which of the following statement about Root word is correct?
  1. It is the basic unit, which describes the carbon skeleton.
  2. Based on the number of carbon atoms present in the carbon skeleton, most of the names are derived from Greek numerals(except first four)
  3. It gives the number of carbon atoms present in the parent chain of the compound and the pattern of their arrangement
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 39 Explanation: 
Root word: It is the basic unit, which describes the carbon skeleton. It gives the number of carbon atoms present in the parent chain of the compound and the pattern of their arrangement. Based on the number of carbon atoms present in the carbon skeleton, most of the names are derived from Greek numerals (except the first four).
Question 40
Match the following:
  1. Hept-                     1. Four
  2. But-                       2. Nine
  3. Pent-                      3. Seven
  4. Non-                      4. Five
A
3, 1, 4, 2
B
2, 4, 3, 1
C
2, 3, 4, 1
D
1, 2, 4, 3
Question 41
Atoms or group of atoms, other than hydrogen, attached to carbon of the parent chain are called__
A
Substituents
B
Presituent
C
Super sonone
D
Sub sonene
Question 41 Explanation: 
The prefix represents the substituents or branch present in the parent chain. Atoms or group of atoms, other than hydrogen, attached to carbon of the parent chain are called substituents.
Question 42
Match the following:
  1. Amino                   1. -I
  2. Bromo                   2. -Br
  3. Ethyl                      3. -NH2
  4. Iodo                       4. -CH2CH3
A
3, 1, 4, 2
B
2, 4, 3, 1
C
3, 2, 4, 1
D
1, 2, 4, 3
Question 43
Which of the following statement is correct?
  1. The suffix forms the end of the name. It is divided into two parts such as (a) Primary suffix and (b) Secondary suffix.
  2. Suffix ‘ene’ and ‘yne’ are used for the compounds containing double and triple bonds respectively
  3. The secondary suffix describes the functional group of the compound
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 43 Explanation: 
The suffix forms the end of the name. It is divided into two parts such as (a) Primary suffix and (b) Secondary suffix. The primary suffix comes after the root word. It represents the nature in carbon to carbon bonding of the parent chain. If all the bonds between the carbon atoms of the parent chain are single, then suffix ‘ane’ has to be used. Suffix ‘ene’ and ‘yne’ are used for the compounds containing double and triple bonds respectively. The secondary suffix describes the functional group of the compound.
Question 44
Match the following:
  1. Alcohols                1. -oic acid
  2. Aldehydes              2. -one
  3. Ketones                 3. -al
  4. Carboxylic acids     4. -ol
A
4, 3, 2, 1
B
2, 4, 3, 1
C
3, 2, 4, 1
D
1, 2, 4, 3
Question 45
Which of the following is not one of the rules for IUPAC naming organic compounds?
A
Identify the longest chain of carbon atoms to get the parent name (root word)
B
Identify the substituent and use a number followed by a dash and a prefix to specify its location and identity.
C
When the primary and secondary suffixes are joined, the terminal ‘e’ of the primary suffix is removed.
D
None
Question 45 Explanation: 
Explanation IUPAC rules for naming organic compounds: Rule1: Identify the longest chain of carbon atoms to get the parent name (root word). Rule 2: Number the carbon atoms of the parent chain, beginning at the closest end of the substituent or functional group. These are called locant numbers. If both functional group and substituent are present, then the priority will be given to the functional group. Rule 3: In case of alkenes and alkynes, locate the double bond or triple bond and use its locant number followed by a dash and a primary suffix. The carbon chain is numbered in such a way that the multiple bonds have the lowest possible locant number Rule 4: If the compound contains functional group, locate it and use its locant number followed by a dash and a secondary suffix Rule 5: When the primary and secondary suffixes are joined, the terminal ‘e’ of the primary suffix is removed Rule 6: Identify the substituent and use a number followed by a dash and a prefix to specify its location and identity
Question 46
CH3-CH2-CH2-CH2-CH3, What is the IUPAC name?
A
Pentane
B
Butane
C
Propane
D
Hexane
Question 46 Explanation: 
CH3-CH2-CH2-CH2-CH3 Step 1: It is a five- carbon chain and hence the root word is ‘Pent’. (Rule 1) Step 2: All the bonds between carbon atoms are single bonds, and thus the suffix is ‘ane’. So, its name is Pent + ane = Pentane
Question 47
What is the IUPAC name of the following compound?
A
2-Methylpentane
B
2-Ethylpentane
C
2-Methylpropane
D
2-ethylpropane
Question 48
What is the IUPAC name of the following: CH3-CH2-CH2-CH=CH2
A
Pentane
B
Pent-1-yne
C
Pent-1-ene
D
Pent-2-ene
Question 49
What is the IUPAC name of the following? CH3-CH2-CH2-OH
A
Propan-1-ol
B
Propan-2-ol
C
Propan-1-al
D
Propan-2-al
Question 50
What is the IUPAC name of the following compound? CH3COOH
A
Ethanoic acid
B
Methanoic acid
C
Propanoic acid
D
Methyl ethyl ether
Question 51
Match the following
  1. Propanol                    1. CH3CH2CH2CH2 COOH
  2. Propanal                      2. CH3CH2CH2OH
  3. Pentanone                       3. CH3COCH2CH2 CH3
  4. Pentanoic acid                    4. CH3CH2CHO
A
4, 3, 2, 1
B
2, 4, 3, 1
C
3, 2, 4, 1
D
1, 2, 4, 3
Question 52
Which of the following statement is correct?
  1. Ethanol is commonly known as alcohol
  2. Its molecular formula is C2H5OH.
  3. All alcoholic beverages and some cough syrups contain ethanol.
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 52 Explanation: 
Ethanol is commonly known as alcohol. All alcoholic beverages and some cough syrups contain ethanol. Its molecular formula is C2H5OH. Its structural formula is
Question 53
Which of the following statement is correct?
  1. Ethanol is manufactured in industries by the fermentation of molasses
  2. Molasses is a by-product obtained during the manufacture of sugar from sugarcane
A
1 alone
B
2 alone
C
1, 2
D
None
Question 53 Explanation: 
Ethanol is manufactured in industries by the fermentation of molasses, which is a by-product obtained during the manufacture of sugar from sugarcane.
Question 54
Molasses contain about _____% of sucrose
A
25
B
30
C
75
D
65
Question 54 Explanation: 
Molasses is a dark coloured syrupy liquid left after the crystallization of sugar from the concentrated sugarcane juice. Molasses contain about 30% of sucrose, which cannot be separated by crystallization.
Question 55
Dilution of molasses is done to bring down the concentration of sugar to about____ percent.
A
6 to 9
B
8 to 10
C
3 to 4
D
1 to 5
Question 55 Explanation: 
Dilution of molasses: Molasses is first diluted with water to bring down the concentration of sugar to about 8 to 10 percent.
Question 56
Which of the following can be added to increase the nitrogen content of the molasses?
  1. Ammonium sulphate
  2. Ammonium phosphate
  3. Nitrous oxide
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 56 Explanation: 
Molasses usually contains enough nitrogenous matter to act as food for yeast during the fermentation process. If the nitrogen content of the molasses is poor, it may be fortified by the addition of ammonium sulphate or ammonium phosphate.
Question 57
What is the temperature required in the fermentation tank?
A
100 degree C
B
303 K
C
423 K
D
321 K
Question 57 Explanation: 
The solution obtained after the addition of nitrogen source is collected in large ‘fermentation tanks’ and yeast is added to it. The mixture is kept at about 303K for a few days.
Question 58
The fermented liquid is technically called_____
A
Rectified spirit
B
Wash
C
Soap
D
None
Question 58 Explanation: 
During fermentation period, the enzymes invertase and zymase present in yeast, bring about the conversion of sucrose into ethanol. The fermented liquid is technically called wash.
Question 59
Which of the following converts sugar into glucose and fructose?
A
Melatonin
B
Invertase
C
Zymase
D
All the above
Question 60
What % of alcohol is contained in wash?
A
15 to 18 %
B
12 to 18 %
C
30 to 60 %
D
25 to 35 %
Question 60 Explanation: 
The fermented liquid that is wash, containing 15 to 18 percent alcohol, is now subjected to fractional distillation.
Question 61
What is the water ethanol percentage composition is rectified spirit?
A
95.5%, 4.5%
B
4.5%, 95.5%
C
92%, 8%
D
85%, 15%
Question 61 Explanation: 
The main fraction drawn is an aqueous solution of ethanol which contains 95.5% of ethanol and 4.5% of water. This is called rectified spirit.
Question 62
Rectified spirit can be converted to absolute alcohol by____
A
Caustic potash
B
Quicklime
C
Caustic soda
D
Slaked lime
Question 62 Explanation: 
Rectified spirit mixture is then refluxed over quicklime for about 5 to 6 hours and then allowed to stand for 12 hours. On distillation of this mixture, pure alcohol (100%) is obtained. This is called absolute alcohol.
Question 63
Yeast belongs to which of the following class?
A
Virus
B
Fungi
C
Bacteria
D
All the above
Question 63 Explanation: 
Yeasts are single–celled microorganisms, belonging to the class of fungi. The enzymes present in yeasts catalyse many complex organic reactions. Fermentation is conversion of complex organic molecules into simpler molecules by the action of enzymes. E.g. Curdling of milk
Question 64
Which of the following property about ethanol is correct?
  1. Ethanol is a colourless liquid, having a pleasant smell and a burning taste.
  2. Its boiling point is 78 degree C which is less than ethane
  3. It is completely miscible with water in all proportions.
A
1, 2
B
1, 3
C
2, 3
D
All the above
Question 64 Explanation: 
Physical properties of Ethanol: Ethanol is a colourless liquid, having a pleasant smell and a burning taste It is a volatile liquid. Its boiling point is 780 C (351K), which is much higher than that of its corresponding alkane, i.e. ethane (Boiling Point = 184 K). It is completely miscible with water in all proportions.
Question 65
At which temperature ethanol is heated with con H2SO4 gets dehydrated?
A
500K
B
443K
C
343K
D
243K
Question 65 Explanation: 
When ethanol is heated with con H2SO4 at 443K, it loses a water molecule i.e. dehydrated to form ethene.
Question 66
What happens when ethanol is heated with Sodium?
A
O2 is liberated
B
O2 is absorbed
C
H2 is liberated
D
H2 is absorbed
Question 66 Explanation: 
Ethanol reacts with sodium metal to form sodium ethoxide and hydrogen gas.
Question 67
During oxidation of Ethanol, the colour of alkaline KMnO4 or acidified K2Cr2O7___
A
Changes from orange to green
B
Changes from green to orange
C
Changes from red to blue
D
Changes from blue to red
Question 67 Explanation: 
Ethanol is oxidized to ethanoic acid with alkaline KMnO4 or acidified K2Cr2O7. During this reaction, the orange colour of K2Cr2O7 changes to green. Therefore, this reaction can be used for the identification of alcohols.
Question 68
The reaction of an alcohol with a carboxylic acid gives a compound having____ odour
A
Pungent
B
Fruity
C
Fungai
D
Smoky
Question 68 Explanation: 
The reaction of an alcohol with a carboxylic acid gives a compound having fruity odour. This compound is called an ester and the reaction is called esterification. Ethanol reacts with ethanoic acid in the presence of conc. H2SO4 to form ethyl ethanoate, an ester.
Question 69
What is used as catalyst dehydrogenation of ethanol?
A
Iron
B
Cu
C
Bromine
D
Nickel
Question 69 Explanation: 
When the vapour of ethanol is passed over heated copper, used as a catalyst at 573 K, it is dehydrogenated to acetaldehyde.
Question 70
Ethanol burns to give______
A
Hydrogen
B
Carbon dioxide
C
Nitrogen
D
Sulphur
Question 70 Explanation: 
Ethanol is highly inflammable liquid. It burns with oxygen to form carbon dioxide and water.
Question 71
Which of the following statement about ethanol is correct?
  1. It in medical wipes, as an antiseptic
  2. It is used for effectively killing micro-organisms like bacteria, fungi, etc., by including it in many hand sanitizers.
  3. It is used as a solvent for drugs, oils, fats, perfumes, dyes, etc.
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 71 Explanation: 
Uses of ethanol: Ethanol is used in medical wipes, as an antiseptic. as an anti-freeze in automobile radiators for effectively killing micro-organisms like bacteria, fungi, etc., by including it in many hand sanitizers. as an antiseptic to sterilize wounds in hospitals as a solvent for drugs, oils, fats, perfumes, dyes, etc to enhance the flavour of food extracts, for example vanilla extract; a common food flavour, which is made by processing vanilla beans in a solution of ethanol and water.
Question 72
What is the percentage of ethanol and methanol in methylated spirit?
A
95, 5
B
91, 9
C
96, 4
D
87, 13
Question 72 Explanation: 
Ethanol is used in the preparation of methylated spirit (mixture of 95% of ethanol and 5% of methanol) rectified spirit (mixture of 95.5% of ethanol and 4.5% of water), power alcohol (mixture of petrol and ethanol) and denatured spirit (ethanol mixed with pyridine).
Question 73
Which of the following is the molecular formula of acetic acid?
A
C2H4O2
B
C2H4O4
C
C4H4O2
D
C2H3O2
Question 73 Explanation: 
Ethanoic acid or acetic acid is one of the most important members of the carboxylic acid family. Its molecular formula is C2H4O2. Its structural formula is
Question 74
Which of the following is used as catalyst to prepare ethanoic acid in large scale?
A
Alkaline potassium permanganate
B
Acidified potassium permanganate
C
Alkaline potassium dichromate
D
All the above
Question 74 Explanation: 
Explanation Ethanoic acid is prepared in large scale, by the oxidation of ethanol in the presence of alkaline potassium permanganate or acidified potassium dichromate.
Question 75
Which of the following are the features of ethanoic acid?
  1. Ethanoic acid is a colourless liquid having an unpleasant odour
  2. It is sour in taste
  3. It is miscible with water in all proportions
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 75 Explanation: 
Physical Properties of ethanoic acid: Ethanoic acid is a colourless liquid having an unpleasant odour. It is sour in taste It is miscible with water in all proportions.
Question 76
  • Assertion(A): Ethanoic acid is also known as glacial acetic acid
  • Reason(R): On cooling, pure ethanoic acid is frozen to form ice like flakes
A
Both (A) and (R) are correct, but (R) does not explain (A)
B
Both (A) and (R) are wrong
C
Both (A) and (R) are correct and (R) explains (A)
D
(A) is Correct and (R) is wrong
Question 76 Explanation: 
On cooling, pure ethanoic acid is frozen to form ice like flakes. They look like glaciers, so it is called glacial acetic acid. Its boiling point is higher than the corresponding alcohols, aldehydes and ketones.
Question 77
What happens when Ethanoic acid reacts with metals?
A
Oxygen is liberated
B
Hydrogen is liberated
C
Carbon dioxide is liberated
D
Oxygen is absorbed
Question 77 Explanation: 
Ethanoic acid reacts with active metals like Na, Zn, etc., to liberate hydrogen and form sodium ethanoate. 2CH3COOH + Zn → (CH3COO)2 Zn + H2 ↑ 2CH3COOH + 2Na → 2CH3COONa + H2 ↑
Question 78
What happens when Ethanoic acid reacts with sodium carbonate and sodium bicarbonate?
A
Oxygen is liberated
B
Hydrogen is liberated
C
Carbon dioxide is liberated
D
Oxygen is absorbed
Question 78 Explanation: 
Ethanoic acid reacts with sodium carbonate and sodium bicarbonate, which are weaker bases and liberates CO2, with brisk effervescence. 2CH3COOH + Na2CO3 → 2CH3COONa + CO2↑ + H2O CH3COOH + NaHCO3 → CH3COONa + CO2↑ + H2O
Question 79
What happens when Ethanoic acid reacts with sodium hydroxide?
A
Water is formed
B
Hydroxylic acid is formed
C
Sodium hydroxide is formed
D
Oxygen is absorbed
Question 79 Explanation: 
Ethanoic acid reacts with sodium hydroxide to form sodium ethanoate and water. CH3COOH + NaOH → CH3COONa + H2O
Question 80
Soda lime_____
A
3 parts of NaOH, 1 part of CaO
B
1 part of NaOH, 3 parts of CaO
C
4 parts of NaOH, 1 part of CaO
D
3 parts of NaOH, 2 parts of CaO
Question 80 Explanation: 
When a sodium salt of ethanoic acid is heated with soda lime (solid mixure of 3 parts of NaOH and 1 part of CaO), methane gas is formed.
Question 81
Which of the following are the uses of Acetic acid?
  1. Acetic acid, in lower concentration, is used as a food additive
  2. In the manufacture of plastic
  3. For coagulating rubber from latex.
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 81 Explanation: 
Acetic acid, in lower concentration, is used as a food additive, a flavoring agent and a preservative. Ethanoic acid is used: in the manufacture of plastic. in making dyes, pigments and paint in printing on fabrics. as a laboratory reagent. for coagulating rubber from latex in the production of pharmaceuticals.
Question 82
Which of the following are the uses of Hydrocarbons?
  1. As a solvent and an antiseptic agent
  2. Fuels like LPG, Petrol, Kerosene.
  3. Polymeric materials like tyre, plastic containers
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 82 Explanation: 
Organic compounds are inseparable in human life. They are used by mankind or associated at all stages of life right from one's birth to death. Various classes of organic compounds and their uses in our daily life as follows: Hydrocarbons Fuels like LPG, Petrol, Kerosene. Raw materials for various important synthetic materials. Polymeric materials like tyre, plastic containers
Question 83
Match the following:
  1. Alcohols                      1. Pain Killer
  2. Aldehydes                  2. Antiseptic agent
  3. Ketones                       3. Raw materials for synthetic materials
  4. Ethers                                4. Stain Remover
A
1, 4, 2, 3
B
2, 3, 1, 4
C
2, 3, 4, 1
D
1, 2, 3, 4
Question 83 Explanation: 
Alcohols As a solvent and an antiseptic agent. Raw materials for various important synthetic materials. Aldehydes Formaldehyde as a disinfectant Raw materials for synthetic materials Ketones As a solvent Stain Remover Ethers Anaesthetic agents. Pain Killer Esters All the cooking oils and lipids contain esters.
Question 84
Which of the following statement is correct?
  1. Soaps and the Detergents are materials that are used by us for cleaning purposes because pure water alone cannot remove all types of dirt or any oily substance from our body or clothes.
  2. They perform their cleaning actions in certain specific conditions.
  3. They contain ‘surfactants’, which are compounds with molecules that line up around water to break the ‘surface tension’
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 84 Explanation: 
Soaps and the Detergents are materials that are used by us for cleaning purposes because pure water alone cannot remove all types of dirt or any oily substance from our body or clothes. They contain ‘surfactants’, which are compounds with molecules that line up around water to break the ‘surface tension’. Both of them having a different chemical nature. They perform their cleaning actions in certain specific conditions.
Question 85
_____ is a cleaning agent that is composed of one or more salts of fatty acids.
A
Salts
B
Detergent
C
Soap
D
Both b and c
Question 85 Explanation: 
Soap is a cleaning agent that is composed of one or more salts of fatty acids. Detergent is a chemical compound or a mixture of chemical compounds, which is used as a cleaning agent, also.
Question 86
Which of the following statement is correct?
  1. Soaps are sodium or potassium salts of some long chain carboxylic acids, called fatty acids.
  2. A potassium-based soap creates a more water-soluble product than a sodium-based soap
  3. Soap requires two major raw materials fat and acid
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 86 Explanation: 
Soaps are sodium or potassium salts of some long chain carboxylic acids, called fatty acids. Soap requires two major raw materials: i) fat and ii) alkali. The alkali, most commonly used in the preparation of soap is sodium hydroxide. Potassium hydroxide can also be used. A potassium-based soap creates a more water-soluble product than a sodium-based soap
Question 87
Which of the following is used in the preparation of hard soaps?
A
NaOH
B
CaOH
C
CaO
D
Ca(OH)2
Question 87 Explanation: 
Soaps, which are prepared by the saponification of oils or fats with caustic soda (sodium hydroxide), are known as hard soaps. They are usually used for washing purpose
Question 88
Which of the following is used in the preparation of hard soaps?
A
Potassium salts
B
Magnesium salts
C
Sodium salts
D
All the above
Question 88 Explanation: 
Soaps, which are prepared by the saponification of oils or fats with potassium salts, are known as soft soaps. They are used for cleansing the body.
Question 89
Which of the following process is used to produce manufacturing of soap?
A
Haber’s process
B
Bayer’s process
C
Kettle process
D
None
Question 89 Explanation: 
Kettle process is the oldest method. But, it is still widely used in the small scale preparation of soap. There are mainly, two steps to be followed in this process.
Question 90
Which of the following statement is correct about Saponification process?
  1. The oil, which is used in this process, is taken in an iron tank (kettle)
  2. The alkaline solution (10%) is added into the kettle, a little in excess
  3. The alkaline solution (10%) is added into the kettle, a little in excess
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 90 Explanation: 
The oil, which is used in this process, is taken in an iron tank (kettle). The alkaline solution (10%) is added into the kettle, a little in excess. The mixture is boiled by passing steam through it. The oil gets hydrolysed after several hours of boiling. This process is called Saponification.
Question 91
Which of the following are contained in hard water?
  1. Calcium ions
  2. Sodium ions
  3. Magnesium ions
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 91 Explanation: 
Hard water contains calcium and magnesium ions (Ca2+ and Mg2+) that limit the cleaning action of soap. Ordinary soaps when treated with hard water, precipitate as salts of calcium and magnesium. They appear at the surface of the cloth as sticky grey scum. Thus, the soaps cannot be used conveniently in hard water.
Question 92
What happens is formed when hard water reacts with soap?
A
Scrum
B
Scum
C
Drum
D
Dump
Question 92 Explanation: 
When combined with soap, hard water develops a thin layer (precipitates of the metal ions) called ‘scum’, which leaves a deposit on the clothes or skin and does not easily rinse away. Over time, this can lead to the deterioration of the fabric and eventually ruin the clothes. On the other hand, detergents are made with chemicals that are not affected by hard water.
Question 93
Which of the following statement about synthetic detergents is correct?
  1. Development of synthetic detergents is a big achievement in the field of cleansing.
  2. These soaps possess the desirable properties of ordinary soaps and also can be used with hard water and in acidic solutions
  3. The detergents do not form precipitates with Ca2+ and Mg2+ present in hard water.
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 93 Explanation: 
Development of synthetic detergents is a big achievement in the field of cleansing. These soaps possess the desirable properties of ordinary soaps and also can be used with hard water and in acidic solutions. These are salts of sulphonic acids or alkyl hydrogen sulphates in comparison to soap, which are salts of carboxylic acids. The detergents do not form precipitates with Ca2+ and Mg2+ present in hard water. So, the cleansing action of detergents is better than that of soaps.
Question 94
Which of the following statement is correct?
  1. Detergents are prepared by adding sulphuric acid to the processed hydrocarbon obtained from petroleum
  2. This chemical reaction result in the formation of molecules similar to the fatty acid in soap.
  3. An alkali is added to the mixture to produce the ‘surfactant molecules’, which do not bond with the minerals present in the hard water, thus preventing the formation of their precipitates
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 94 Explanation: 
Detergents are prepared by adding sulphuric acid to the processed hydrocarbon obtained from petroleum. This chemical reaction result in the formation of molecules similar to the fatty acid in soap. Then, an alkali is added to the mixture to produce the ‘surfactant molecules’, which do not bond with the minerals present in the hard water, thus preventing the formation of their precipitates.
Question 95
Which of the following enable the removal of certain stains from the cloth?
A
Sodium chloride
B
Sodium perborate
C
Sodium Per-oxide
D
Sodium hydroxide
Question 95 Explanation: 
Oxygen bleaches, such as ‘sodium perborate’, enable the removal of certain stains from the cloth. Sodium sulphate is added to prevent the caking of the detergent powder. Enzymes are added to break down some stains caused by biological substances like blood and vegetable juice.
Question 96
Which of the following in ‘surfactant’ prevent corrosion in washing machine?
A
Sodium chloride
B
Sodium perborate
C
Sodium silicate
D
Sodium hydroxide
Question 96 Explanation: 
Sodium silicate, which prevents the corrosion and ensures that the detergent does not damage the washing machine. Fluorescent whitening agents that give a glow to the clothes.
Question 97
Which of the following statement is incorrect?
  1. A soap molecule contains two chemically distinct parts that interact differently with water
  2. Non-polar end, which is a short head with a carboxylate group (–COONa)
  3. Polar end having the long tail made of the hydrocarbon chain
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 97 Explanation: 
A soap molecule contains two chemically distinct parts that interact differently with water. It has one polar end, which is a short head with a carboxylate group (–COONa) and one non-polar end having the long tail made of the hydrocarbon chain.
Question 98
Which of the following statement is incorrect?
  1. The polar end is hydrophilic in nature and this end is attracted towards water.
  2. The non-polar end is hydrophobic in nature
A
1 alone
B
2 alone
C
1, 2
D
None
Question 98 Explanation: 
The polar end is hydrophilic (Water loving) in nature and this end is attracted towards water. The non-polar end is hydrophobic (Water hating) in nature and it is attracted towards dirt or oil on the cloth, but not attracted towards water. Thus, the hydrophobic part of the soap molecule traps the dirt and the hydrophilic part makes the entire molecule soluble in water.
Question 99
Which of the following statement is correct?
  1. When a soap or detergent is dissolved in water, the molecules join together as clusters called ‘micelles’
  2. Their long hydrocarbon chains attach themselves to the oil and dirt.
  3. The dirt is thus surrounded by the non-polar end of the soap molecules
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 99 Explanation: 
When a soap or detergent is dissolved in water, the molecules join together as clusters called ‘micelles’. Their long hydrocarbon chains attach themselves to the oil and dirt. The dirt is thus surrounded by the non-polar end of the soap molecules. The charged carboxylate end of the soap molecules makes the micelles soluble in water. Thus, the dirt is washed away with the soap.
Question 100
Which of the following statement about advantages of detergents over soaps is correct?
A
They can be used in both hard and soft water and can clean more effectively in hard water than soap.
B
Do not leave any soap scum on the tub or clothes.
C
They can be used for washing woollen garments, whereas soap cannot be used.
D
All the above
Question 100 Explanation: 
Detergents are better than soaps because they: can be used in both hard and soft water and can clean more effectively in hard water than soap. can also be used in saline and acidic water do not leave any soap scum on the tub or clothes. dissolve freely even in cool water and rinse freely in hard water. can be used for washing woollen garments, whereas soap cannot be used. have a linear hydrocarbon chain, which is biodegradable. are active emulsifiers of motor grease.
Question 101
Which of the following statement about soap is correct?
  1. It is prepared from animal fats or vegetable oils
  2. It has rich foaming capacity.
  3. Soaps are biodegradable
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 102
Which of the following statement about detergent is correct?
  1. It is sodium salts of sulphonic acids.
  2. It has rich foaming capacity
  3. It is prepared from hydrocarbons obtained from crude oil.
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 103
Which of the following statement about TFM of soap is correct?
  1. TFM means TOTAL FATTY MATTER
  2. It is the one of the important factors to be considered to assess the quality of soap
  3. A soap, which has lower TFM, is a good bathing soap
A
1, 2
B
2, 3
C
1, 3
D
All the above
Question 103 Explanation: 
TFM means TOTAL FATTY MATTER. It is the one of the important factors to be considered to assess the quality of soap. A soap, which has higher TFM, is a good bathing soap
Question 104
A
2, 3, 4, 1
B
2, 4, 3, 1
C
1, 3, 4, 2
D
1, 4, 3, 2
Question 105
A
2, 1, 3
B
2, 3, 1
C
1, 3, 2
D
3, 1, 2
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