Assertion and Reason Questions for Class 10 Science Chapter 4 Carbon and Its Compounds

Board	CBSE
Useful for	Class 10 Students
Subject	Science
Chapter	Chapter 4 Carbon and Its Compounds
Question Type	Assertion and Reason Questions
No. of Questions	25
With Answers	Yes
Important Link	Class 10 Science Chapterwise Assertion Reason

Assertion and Reason Questions for Class 10 Science Chapter 4 Carbon and Its Compounds

Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Q.1. 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)

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Q.2. 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)

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Q.3. 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)

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Q.4. Assertion(A) : Soaps are not suitable for washing purpose when water is hard.
Reason (R) : Soaps have relatively weak cleansing action.

Answer

(b)

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Q.5. Assertion(A) : Carbon compounds can form chain, branched and ring structures.
Reason (R) : Carbon exhibits the property of catenation.

Answer

(a)

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Q.6. Assertion (A) : Carbon monoxide is extremely poisonous in nature.
Reason (R) : Carbon monoxide is formed by complete combustion of carbon.

Answer

(c)

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Q.7. Assertion (A) : Cooking oil decolourises bromine water.
Reason (R) : Cooking oil is a saturated compound.

Answer

(b)

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Q.8. 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)

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Q.9. Assertion (A) : Alkanes give addition reaction.
Reason (R) : Addition reactions are a characteristic property of unsaturated hydrocarbons.

Answer

(d)

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Q.10. 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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Q.11. Assertion(A): Saturated hydrocarbons are chemically less reactive.
Reason (R) : All the valencies of carbon atom are satisfied by single covalent bonds.

Answer

Ans. (a)

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Q.12. Assertion(A): Diamond and graphite do not have the same crystal structure.
Reason (R) : Diamond is crystalline while graphite is amorphous.

Answer

Ans. (c)

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Q.13. Assertion(A): Graphite is soft and slippery to touch.
Reason (R) : Graphite has sheet like layered structure.

Answer

Ans. (a)

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Q.14. Assertion(A): Both aldehydes and ketones contain carbonyl group.
Reason (R) : In aldehydes, the functional group is attached to atleast one hydrogen atom.

Answer

Ans. (b)

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Q.15. Assertion(A): In alkanes, alkenes and alkynes the valency of carbon is always four.
Reason (R) : All hydrocarbons except alkanes contain double bonds.

Answer

Ans. (c)

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Q.16. Assertion(A): Graphite is a good conductor of electricity.
Reason (R) : It has one free valence electron.

Answer

Ans. (a)

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Q.17. Assertion(A): The functional group present in alcohols is – OH.
Reason (R) : It is the same group as present in water, hence water and alcohol have similar properties.

Answer

Ans. (c)

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Q.18. Assertion(A): Ethanol is first member of the alcohol homologous series.
Reason (R) : A homologous series can be represented by a general formula.

Answer

Ans. (d)

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Q.19. Assertion(A): Carbon and its compounds can be used as fuels.
Reason (R) : They are highly inflammable and have high calorific value.

Answer

Ans. (a)

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Q.20. Assertion(A): Covalent compounds are generally poor conductor of electricity.
Reason (R) : They consist of molecules and not ions which can transfer charge.

Answer

Ans. (a)

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Q.21. Assertion(A): Diamond is not good conductor of electricity.
Reason: It has no free electrons.

Answer

Ans. (a)

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Q.22. Assertion(A): Olefins have the general formula C_nH_2n+1
Reason (R) : There is at least one double bond between two carbon atoms in their molecules.

Answer

Ans. (d)

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Q.23. Assertion(A): Carbon possesses property of catenation.
Reason (R) : Carbon atoms form double as well as triple bonds during catenation.

Answer

Ans. (b)

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Q.24. Assertion(A): Two members of a homologous series have similar chemical properties.
Reason (R) : Propane and butane are members of same homologous series.

Answer

Ans. (b)

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Q.25. Assertion(A): Diamond is the hardest natural known substance.
Reason (R) : Diamond is used for cutting marble, granite and glass.

Answer

Ans. (b)

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