MCQ Questions for Class 10 Science Carbon and Its Compounds with Answers

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Class 10 Science MCQ Chapter 4 Carbon and Its Compounds

Question 1. Which of the following statements are correct for carbon compounds?
(i) Most carbon compounds are good conductors of electricity.
(ii) Most carbon compounds are poor conductors of electricity.
(iii) Force of attraction between molecules of carbon compounds is not very strong.
(iv) Force of attraction between molecules of carbon compounds is very strong.
(a) (ii) and (iv)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (i) and (iii)

Question 2. C₃H₈ belongs to the homologous series of
(a) Alkynes
(b) Alkenes
(c) Alkanes
(d) Cyclo alkanes

Question 3.

(a) 2-ethyl-2-methyl propane
(b) 2, 2-demethyl butane
(c) 1,1,1-trimethyl propane
(d) 2, 2-methyl butane

Question 4. Which of the following is the formula of Butanoic acid?

Question 5. The number of isomers of pentane is
(a) 2
(b) 3
(c) 4
(d) 5

Question 6. Which of the following will undergo addition reactions?
(a) CH₄
(b) C₃H₈
(C) C₂H₆
(d) C₂H₄

Question 7. When ethanoic acid is treated with NaHCO^ the gas evolved is
(a) H₂
(b) CO₂
(c) CH₄
(d) CO

Question 8. Ethanol on complete oxidation gives
(a) acetic acid/ethanoic acid
(b) CO₂ and water
(c) ethanal
(d) acetone/ethanone

Question 9. Which of the following will give a pleasant smell of ester when heated with ethanol and a small quantity of sulphuric acid?
(a) CH₃COOH
(b) CH₃CH₂OH
(c) CH₃OH
(d) CH₃CHO

Question 10. Name the functional group present in CH₃COCH₃.
(a) Alcohol
(b) Carboxylic acid
(c) Ketone
(d) Aldehyde

Question 11. Why does carbon form compounds mainly by covalent bonding?
(a) There are four electrons in the outermost shell of carbon.
(b) It requires large amount of energy to form C⁴⁺ or C4sup>4-.
(c) It shares its valence electrons to complete its octet.
(d) All the above.

Question 12. Addition reactions are undergone by
(a) saturated hydrocarbons (alkanes)
(b) only alkenes
(c) only alkynes
(d) both alkenes and alkynes

Question 13. Identify ‘A’ in the following reaction:
CH₃COOH + Na₂CO₃ → A + CO₂ + H₀O
(a) CH₃COONa
(b) CH₂(Na)COOH
(c) NaOH
(d) NaHCO₃

Question 14. Which of the following belongs to homologous series of alkynes?
C₆H₆, C₂H₆, C₂H₄, C₃H₄.
(a) C₆H₆
(b) C₂H₄
(C) C₂H₆
(d) C₃H₄

Question 15. A hydrocarbon has four carbon atoms. Give its molecular formula if it is an alkene.
(a) C₄H₁₀
(b) C₄H₈
(C) C₄H₆
(d) C₄H₄

Question 16. Identify A and B

Question 17. Give the IUPAC name of CH₃COOC₂H₅.
(a) Ethyl ethanoic acid
(b) Butanoate
(c) Ethyl ethanoate
(d) Etyl methyl carboxylic acid

Question 18. The firSt member of the alkyne homologous series is
(a) propyne
(b) ethyne
(c) methane
(d) ethene

Question 19. In diamond, each carbon atom is bonded to four other carbon atoms to form
(a) a hexagonal array
(b) a rigid three-dimensional structure
(c) a structure in the shape of a football
(d) a structure of a ring

Question 20. A soap molecule has a
(a) hydrophobic head and hydrophobic tail
(b) hydrophobic head and hydrophilic tail
(c) hydrophilic head and hydrophilic tail
(d) hydrophilic head and hydrophobic tail

Fill in the Blanks
1. ………. is a versatile element that forms the basis for all living organisms and many of the things we use.
2. Covalent bonds are formed by the ………. of electrons between two atoms so that both can achieve a
completely filled outermost shell.
3. The unsaturated hydrocarbons which contain one or more double bonds are called
4. The general formula of alkynes is ………. .
5. A group of organic compounds having similar structures and similar chemical properties in which the successive compounds differ by CH2 group is called a ………. .
6. ………. are sweet-smelling substances which are used in making perfumes.

ANSWERS
1. Carbon
2. sharing
3. alkenes
4. C_nH_2n-2
5. homologous series
6. Esters

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