Question

Example of thermal decomposition reaction are:

1. \( \text{2AgCl} \rightarrow \text{2Ag} + \text{Cl}_2 \)
2. \( \text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2 \)
3. \( \text{2H}_2\text{O} \rightarrow \text{2H}_2 + \text{O}_2 \)
4. \( \text{2KClO}_3 \rightarrow \text{2KCl} + \text{3O}_2 \)

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (iii) and (iv)
• D. (ii) and (iv)

Hint:

For thermal decomposition reactions, the compound breaks down into simpler compounds or elements upon heating.

Answer 1

The Correct Option is D

- The thermal decomposition reactions involve breaking down compounds into simpler products by heat.
- Reaction (ii) \( \text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2 \) is a typical thermal decomposition reaction.
- Reaction (iv) \( 2 \, \text{KClO}_3 \rightarrow 2 \, \text{KCl} + 3 \, \text{O}_2 \) is also a thermal decomposition reaction.
Thus, the correct answer is (D).