Question

Assertion (A): All exothermic reactions are accompanied with evolution of heat and light.

Reason (R): Combination reactions may or may not be exothermic.

Options

• Both, Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).

• Both, Assertion (A) and Reason (R) are true, and Reason (R) is not the correct explanation of Assertion (A).

• Assertion (A) is true, but Reason (R) is false.

• Assertion (A) is false, but Reason (R) is true.

Answer 1

Both, Assertion (A) and Reason (R) are true, and Reason (R) is not the correct explanation of Assertion (A).

Explanation:

While each combination reaction may or may not be exothermic, as the reaction between N₂ and O₂ is endothermic, exothermic reactions release energy in the form of heat and occasionally light.