\( \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \stackrel{\mathrm{Fe}+\mathrm{Mo}}{...

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\( \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \stackrel{\mathrm{Fe}+\mathrm{Mo}}{=} 2 \mathrm{NH}_{3}(\mathrm{~g}) ; \) Habers process, Mo is used as :
\( P \)
(A) A catalyst
(B) A catalytic promoter
W.
(C) An oxidising agent
(D) As a catalytic poison
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