Carbon and Its Compounds Class 10 Solutions of Practice Questions

Carbon and Its Compounds Class 10 Solutions

Ans 1. (i) CH₃Cl Chloromethane
(ii) C₂H₅Cl Chloroethane

Ans 2. Covalent compounds have low melting and boiling points due to small intermolecular forces of attraction between the atoms.

Ans 3. (i) Alcohol group
(ii) Carboxylic acid group

Ans 4. Unsaturated hydrocarbons have more amount of carbon, therefore burn with smoky flame due to incomplete combustion.

Ans 5. (i) Valency of each carbon atom in an alkane is four.
(ii) Valency of each carbon atom in an alkyne is four.

Ans 6. (i) Catenation
(ii) Tetravalency of carbon

Ans 7. Soap reacts with Ca²⁺ and Mg²⁺ ions present in hard water to form scum.

Ans 8. In the structure of a diamond, all four valence electrons of carbon are involved in the formation of covalent bonds. Thus, no free electrons are available. Whereas, in the structure of graphite, three electrons in the valence shell of carbon are involved in covalent bond formation and the fourth electron is free to move. Therefore, graphite is a good conductor of electricity.

Ans 9. (a) Carbon forms a large number of compounds since carbon is small in size and can form stable covalent bonds (catenation) and it shows tetravalency.

(b) Air holes of the gas burner are made open (adjusted) so that air can pass through, which is needed for complete combustion so that heated vessels do not get blackened.

Ans 10. The purple color of KMnO₄ decolorises and ethanoic acid will be formed
C₂H₅OH ——Alk KMnO₄ —–àCH₂ COOH

Ans 11. (b) Ni

Ans 12. (a) only single bonds

Ans 13. (b) CH₄

Ans 14. (d) Lamp black

Ans 15. (b) Ethane

Ans 16. (d) LPG

Ans 17. (c) They all contain double bond

Ans 18. (a) Addition reaction

Ans 19. (c) Graphite is a bad conductor of heat and electricity.

Ans 20. (c) Carbon dioxide and water

Ans 21. (a) Glycerol

Ans 22. (a) 14 a.m.u and CH₂ respectively

Ans 23. (d) CCl₄

Ans 24. (b) Molecular formula

Ans 25. (b) Unsaturated, as sooty deposit represents unburnt hydrocarbons

Ans 26. (d) Sugar-ethanol

Ans 27. (b) Cyclohexane

Ans 28. (b) carbon monoxide in traces and carbon dioxide.

Ans 29. (a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).

Ans 30. (a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).

Ans 31. (d) Assertion (A) is false but reason (R) is true. Carbon compounds are mainly poor conductors of electricity.

Ans 32. (d) Assertion (A) is false but reason (R) is true.

Ans 33. (d) Assertion (A) is false but reason (R) is true.

Ans 34. (a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).

Ans 35. (b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).

 

Carbon and Its Compounds Class 10 Practice Questions