Give reasons for the observations :
It is necessary to remove CO when ammonia is prepared by Haber's process.

Explanation

To understand why it is necessary to remove carbon monoxide (CO) when ammonia is prepared by the Haber process, we can break down the explanation into several key points:

### Step-by-Step Solution:

1. **Understanding the Haber Process**:
- The Haber process is used to synthesize ammonia (NH₃) from nitrogen (N₂) and hydrogen (H₂) gases. The reaction can be represented as:
\[
N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)
...