KEAM 2018 Physics and Chemistry Paper

In formation of NH3 by Haber's process.
N2(g)+3H2(g)

∆,‌ catalyst ‌

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2NH3(g)
(i) When Mo is used as catalyst, it increase the rate of formation of NH3 because it behaves as promoter.
(ii) But, when CO is used as catalyst it decreases the formation of NH3 because it behaves as poisoning agent.