Most Important MCQ Questions for Class 10 Science Chapter 4 Carbon and Its Compounds with Answers

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Q1. Lead pencil contains

(a) graphite
(b) diamond
(c) lead
(d) lead sulphate

(a) graphite

Mineral acids are stronger acids than carboxylic acids because
(i) mineral acids are completely ionised
(ii) carboxylic acids are completely ionised
(iii) mineral acids are partially ionised
(iv) carboxylic acids are partially ionised

(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) (iii) and (iv)

(a) (i) and (iv)

Q3. When ethyl alcohol and acetic acid are mixed, the resulting ester has a chemical formula

(a) CH3COOC2H5
(b) C2H5COOCH3
(c) C2H5COOC2H5

(a) CH3COOC2H5

Q4. A few drops of ethanoic acid were added to solid sodium carbonate. The observation made was that

(a) a hissing sound was produced
(b) brown fumes evolved
(c) brisk effervescence occurred
(d) a pungent smelling gas evolved

(c) brisk effervescence occurred

Q5. A reagent which can help us to distinguish between alkenes and alkynes is:

(a) Bromine water
(b) Carbon tetrachloride
(c) Alkaline KMnO4
(d) Ammoniacal cuprous chloride

(d) Ammoniacal cuprous chloride

Q6. The soap molecule has a

(a) hydrophilic head and a hydrophobic tail
(b) hydrophobic head and a hydrophilic tail
(c) hydrophobic head and a hydrophobic tail
(d) hydrophilic head and a hydrophilic tail

(a) hydrophilic head and a hydrophobic tail

Q7. Detergents can be used for washing of clothes

(a) only in hard water
(b) only in soft water
(c) both in soft and hard water
(d) None of the above

(c) both in soft and hard water

Q8. The number of carbon atom present in the molecule of fifth member of the homologous series of alkynes is :

(a) four
(b) five
(c) six
(d) seven

(c) six

Q9. Which of the following is homologous pair?

(a) CH4 and C2H4
(b) CH3OH and CH3CHO
(c) HCHO and CH3CHO
(d) C3H5OH and CH3COCH3.

(c) HCHO and CH3CHO

Q11. The important feature of homologous series is :

(a) Difference in the chemical properties of compounds.
(b) Difference in the general formula of compounds
(c) Specific methods of formation of compounds
(d) Similarly in the functional group of compounds.

(d) Similarly in the functional group of compounds.

Q12. IUPAC name of ethyl alcohol is :

(a) Ethanol
(b) Methanol
(c) Acetic Acid
(d) Ethanoic Acid.

(a) Ethanol

Q13. Reason of high number of organic compounds is :

(a) High activeness of carbon
(b) Changeable valency of carbon
(c) Ability ty of carbon to make covalent compound
(d) Abilito make series by connecting atoms together.

(d) Abilito make series by connecting atoms together.

Q14. IUPAC name of formaldehyde:

(a) Formaldehyde
(b) Methanol
(c) Ethanol
(d) Aceteldehyde.

(b) Methanol

Q15. The IUPAC name of Carbon and its Compounds Class 10 Extra Questions with Answers Science Chapter 4 71 is :

(a) butanone
(b) propanone
(c) butanol
(d) propanol

(b) propanone

Q16. The organic compounds having ketonic group is :

(b) CH3COCH3
(d) CH3CH2OH

(b) CH3COCH3

Q17. Which of the given can be used for the denaturation of ethyl alcohol?

A. Methyl alcohol
B. Pyridines
C. Copper sulphate
D. All of these

(D) All of these

Q18. Soaps are formed by saponification of

A. Alcohols
B. Glycosides
C. Simple esters
D. Carboxylic acids

(C) Simple esters

Q19. Carbon exists in the atmosphere in the form of

A. Only carbon monoxide
B. Carbon monoxide in traces and carbon dioxide
C. Only carbon dioxide
D. Coal

(C) Only carbon dioxide

Q20. Which of the following statements are usually correct for carbon compounds? These

(a) Are good conductors of electricity.
(b) Are poor conductors of electricity.
(c) Have strong forces of attraction between their molecules.
(d) Do not have strong forces of attraction between their molecules.
A. (A) & (C)
B. (B) & (C)
C. (A) & (D)
D. (B) & (D)

(D) (B) & (D)

Q21. A molecule of ammonia (NH₃) has

A. Only single bonds
B. Only double bonds
C. Only triple bonds
D. Two double bonds and one single bond

(A) Only single bonds

Q22. Buckminsterfullerene is an allotropic form of

A. Phosphorus
B. Sulphur
C. Carbon
D. Tin

(C) Carbon

Q23. Which of the given is not an aliphatic hydrocarbon?

A. Ethene
B. Ethane
C. Propyne
D. Benzene

(D) Benzene

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