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JEE Main levelSingle correct optionDifficulty 2 of 3sc075

In the Haber process the catalyst, its promoter and a common poison are, respectively,

ANi, Mo, $H X_{2} S$
BFe, Mo, $H X_{2}$
CFe, Mo, $H X_{2} S$
DPt, Fe, $As X_{2} O X_{3}$

Answer: C

The Haber process uses finely divided iron with molybdenum as promoter, and

H X_{2} S

poisons the iron surface.

H X_{2}

is a reactant, and Pt with

As X_{2} O X_{3}

belongs to the contact process.

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