Question

Assertion: Nitrogen and hydrogen combine together to form ammonia.
Reason: It is an exothermic reaction.

• A. Both assertion and reason are true and the reason is the correct explanation of assertion.
• B. Both assertion and reason are true but the reason is not the correct explanation of assertion.
• C. The assertion is true but the reason is false.
• D. Both assertion and reason are false.

Answer 1

The correct option is B Both assertion and reason are true but the reason is not the correct explanation of assertion.

• In the reaction, bonds between two atoms of nitrogen molecule and atoms of hydrogen molecules are broken. Simultaneously, new bonds between nitrogen and hydrogen atoms are formed resulting in the formation of ammonia.
• During this process, heat energy is liberated to the surroundings. Therefore, this reaction is exothermic.

Hence, the reason given is not an explanation but could be consider as an observation.