Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of
Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true
1) Assertion: Ethanoic acid liberates hydrogen with Sodium metal.
Reason: More reactive sodium displaces hydrogen from ethanoic acid.
Answer – (a) Both the Assertion and the Reason are correct and the Reason is the
correct explanation of the Assertion.
2) Assertion: Ethanoic acid reacts with ethyl alcohol in presence of conc H2SO4 to form ethyl ethanoate.
Reason: Esters are used in ice creams and cold drinks.’
Answer – (b) The Assertion and the Reason are correct but the Reason is not the
correct explanation of the Assertion.
3) Assertion: Carbon forms a large number of organic compounds.
Reason : Carbon atom contains 6 valence electrons.
Answer – (c) Assertion is true but the Reason is false.
4) Assertion: During the reaction esterification esters are produced.
Reason: Esters are sweet smelling compounds.
Answer – (b) The Assertion and the Reason are correct but the Reason is not the
correct explanation of the Assertion.
5) Assertion: Vegetable oils are unsaturated, react with hydrogen in presence of nickel to form vegetable ghee.
Reason: This reaction is saponification.
Answer – (c) Assertion is true but the Reason is false.
6) Assertion(A) : Carbon is the only element that can form large number of compounds.
Reason (R) : Carbon is tetravalent and shows the property of catenation.
Answer(d)
7) Assertion(A) : If the first member of a homologous series is methanal, its third member will be propanal.
Reason (R) : All the members of a homologous series show similar chemical properties.
Answer(b)
8) Assertion(A) : Diamond and graphite are allotropes of carbon.
Reason (R) : Some elements can have several different structural forms while in the same physical state. These forms are called allotropes.
Answer(a)
9) Assertion(A) : Soaps are not suitable for washing purpose when water is hard.
Reason (R) : Soaps have relatively weak cleansing action.
Answer(b)
10) Assertion(A) : Carbon compounds can form chain, branched and ring structures.
Reason (R) : Carbon exhibits the property of catenation.
Answer(a)
11) Assertion (A) : Carbon monoxide is extremely poisonous in nature.
Reason (R) : Carbon monoxide is formed by complete combustion of carbon.
Answer(c)
12) Q.7. Assertion (A) : Cooking oil decolourises bromine water.
Reason (R) : Cooking oil is a saturated compound.
Answer(b)
13) Assertion (A) : In a candle, wax vapours burn in sufficient supply of oxygen, which leads to blue flame.
Reason (R) : When the oxygen supply is sufficient, then fuels burn completely producing a blue flame.
Answer(a)
14) Assertion (A) : Alkanes give addition reaction.
Reason (R) : Addition reactions are a characteristic property of unsaturated hydrocarbons.
Answer(d)
15) Assertion(A): n-butane and iso-butane are examples of isomers.
Reason (R) : Isomerism is possible only with hydrocarbons having 4 or more carbon atoms.
Answer(b)
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