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In the Haber process for synthesising ammonia, N2(g) + 3H2(g) ⇌ 2NH3(g), molybdenum (Mo) functions as which of the following?

1. a catalyst
2. a catalytic promoter
3. an oxidising agent
4. as a catalytic poison

Correct answer: a catalytic promoter

Solution

In the Haber process iron is the catalyst, while molybdenum is added as a promoter to increase the catalyst's efficiency.

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