Solution

Here are 20 multiple-choice questions (MCQs) with answers from the chapter "Carbon and Its Compounds" (Class 10):

1. Carbon Forms Covalent Bonds Because:

✅ A) It has 4 valence electrons

2. Which of the following is a saturated hydrocarbon?

✅ C) C₂H₆

3. The general formula of alkynes is:

✅ C) CₙH₂ₙ₋₂

4. Which of the following is an allotrope of carbon?

✅ A) Graphite

5. Ethanol reacts with sodium to form:

✅ B) Sodium ethoxide

6. The functional group present in aldehydes is:

✅ B) -CHO

7. Which of the following is used for the hydrogenation of vegetable oils?

✅ A) Ni (Nickel)

8. Which of the following statements is incorrect about diamond?

✅ B) It is a good conductor of electricity (Diamond is an insulator, only graphite conducts electricity.)

9. Which of the following is a homologous series?

✅ D) All of the above (Alkanes, Alkenes, Alkynes)

10. The IUPAC name of CH₃COOH is:

✅ B) Ethanoic acid

11. The process of converting ethanol to ethanoic acid is called:

✅ B) Oxidation

12. Which of the following compounds does not decolorize bromine water?

✅ C) Ethane (Only unsaturated hydrocarbons (alkenes, alkynes) decolorize bromine water.)

13. Which of the following is an unsaturated hydrocarbon?

✅ C) Ethene (Alkenes and alkynes are unsaturated.)

14. Which of the following is the main component of vinegar?

✅ B) Ethanoic acid

15. The molecular formula of benzene is:

✅ A) C₆H₆

16. The addition of hydrogen to unsaturated hydrocarbons is called:

✅ B) Hydrogenation

17. Soap is formed by the reaction of:

✅ B) Fat and base (This process is called saponification.)

18. The substance used for making soaps is:

✅ B) Sodium hydroxide (NaOH)

19. Which of the following is an aromatic hydrocarbon?

✅ C) Benzene

20. Hard water does not form lather with soap because it contains:

✅ C) Magnesium and calcium ions (These ions react with soap to form scum.)

Let me know if you need more questions or explanations!