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Given below are two statements labeled as Assertion (A) and Reason (R)

Assertion: At high pressure, decomposition of ammonia on the catalyst surface is a first order reaction.

Reason: At high pressure, on changing the reaction conditions, the concentration of ammonia on the surface of the catalyst does not change.

 Select the most appropriate answer from the options given below:

(a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false.

(d) A is false but R is true.

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Correct answer is (d) A is false but R is true. 

Decomposition of ammonia follows zero order kinetics. At high pressure, on changing the reaction conditions, the concentration of ammonia on the surface of the catalyst does not change.

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