Distinguish between the pairs of compounds using the reagent given in the bracket.
Ferrous sulphate solution and ferric sulphate solution. (using sodium hydroxide solution)

Explanation

To distinguish between ferrous sulphate solution (FeSO4) and ferric sulphate solution (Fe2(SO4)3) using sodium hydroxide solution (NaOH), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compounds**:
- Ferrous sulphate (FeSO4) contains iron in the +2 oxidation state.
- Ferric sulphate (Fe2(SO4)3) contains iron in the +3 oxidation state.

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