Name the catalyst used in the following process :
(a) Haber's process for the manufacture of `NH_(3)` gae.
(b) Ostwald process for the manufacture of nitric acid .

Explanation

To answer the question regarding the catalysts used in the specified processes, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Identify the Processes**:
- The two processes mentioned are the Haber process and the Ostwald process.

2. **Haber Process**:
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