(A) Decomposition of Ammonia on platinum surface at high pressure is a zero order reaction.
(R) At high pressure, metal surface gets saturated with gas molecules.

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

(A) is correct but (R) is wrong.

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

(A) and (R) both are wrong.

answer is A.

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Detailed Solution

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.

Therefore, the correct option is (A).

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