Identify the cations in each of the following cases : (i) NaOH solution when added to the Solution (A) gives a reddish brown precipitate. (ii) NH4OH Solution when added to the Solution (B) gives white precipitate which does not dissolve in excess.

Explanation

To identify the cations in the given cases, we will analyze each situation step by step.

### Step 1: Analyze the first case
- **Given**: Sodium hydroxide (NaOH) solution is added to Solution (A), resulting in a reddish-brown precipitate.
- **Observation**: The formation of a reddish-brown precipitate indicates the presence of ferric ions (Fe³⁺).
- **Reaction**: When NaOH is added to a solution containing Fe³⁺ ions, it reacts to form ferric hydroxide (Fe(OH)₃), which is a reddish-brown precipitate.

**Conclusion for Case (i)**: The cation present in Solution (A) is **Fe³⁺ (ferric ions)**.
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