Assertion: The decomposition of gaseous ammonia on a hot platinum surface is a zero order reaction at high pressure. Reason: For a zero order reaction, the rate of reaction is independent of initial concentration.

Question

Assertion: The decomposition of gaseous ammonia on a hot platinum surface is a zero order reaction at high pressure. Reason: For a zero order reaction, the rate of reaction is independent of initial concentration. (A) If both assertion and reason are true and reason is the correct explanation of assertion. (B) If both assertion and reason are true but reason is not the correct explanation of assertion. (C) If assertion is true but reason is false. (D) If both assertion and reason are false.

Tardigrade Admin · Accepted Answer

At high pressure, the metal surface gets saturated with gas molecules. So a further change in reaction conditions is unable to alter the amount of ammonia on the surface of the catalyst making rate of the reaction independent of its concentration.

Q. Assertion: The decomposition of gaseous ammonia on a hot platinum surface is a zero order reaction at high pressure. Reason : For a zero order reaction, the rate of reaction is independent of initial concentration.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false.

At high pressure, the metal surface gets saturated with gas molecules. So a further change in reaction conditions is unable to alter the amount of ammonia on the surface of the catalyst making rate of the reaction independent of its concentration.

Q. Assertion: The decomposition of gaseous ammonia on a hot platinum surface is a zero order reaction at high pressure.
Reason : For a zero order reaction, the rate of reaction is independent of initial concentration.