Question

Which of the following reactions is an exothermic reaction? *
Burning of coal
Decomposition of vegetable matter into compost
Process of respiration
Decomposition of calcium carbonate to form quick lime and carbon dioxide.
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Answer 1

Answer:

Answer: The endothermic reaction is (iv) decomposition of calcium carbonate to form quick-lime and carbon dioxide.

Explanation:

Explanation: In this reaction, calcium carbonate decompose in the presence of energy formed by the heat (thermal decomposition).

Answer 2

Answer:

Burning of coal

Process of respiration

Decomposition of calcium carbonate to form quick lime and carbon dioxide

Explanation:

since during all these processes energy is released