25 g of a sample of ferrous sulphate was dissolved in water containing dilute `H_(2)SO_(4)` and the volume made up to one litre.

25 g of a sample of ferrous sulphate was dissolved in water containing dilute `H_(2)SO_(4)` and the volume made up to one litre. 25 mL of this solution required 20 mL of `N//10 KMnO_(4)` solution for complete oxidation. Calculate the percentage of `FeSO_(4). 7H_(2)O` in the sample.

25 g of a sample of ferrous sulphate was dissolved in water containing dilute `H_(2)SO_(4)` and the volume made up to one litre. 25 mL of this solutio

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