Question

In $NH_3$ synthesis by Haber?s process, what is the effect on the rate of the reaction with the addition of Mo and CO, respectively?

• A. Increases and decreases
• B. Decreases and decreases
• C. Decreases and increases
• D. Both Mo and CO increases the rate

Answer 1

Answer: (A)

Increases and decreases

Answer 2

In formation of $NH _{3}$ by Haber's process.

$N _{2}(g)+3 H _{2}(g) \stackrel{\Delta, \text { catalyst }}{\longrightarrow} 2 NH _{3}(g)$

(i) When Mo is used as catalyst, it increase the rate of formation of $NH _{3}$ because it behaves as promoter.

(ii) But, when CO is used as catalyst it decreases the formation of $NH _{3}$ because it behaves as poisoning agent.