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19.6 gm of ferrous ammonium sulphate [Fe...

19.6 gm of ferrous ammonium sulphate `[FeSO_4(NH_4)_2SO_4 .6H_2O]` were dissolved and made up to 500 ml with acidified water. 25 ml of this solution required 20 ml and 27.5 ml of the solution A and B of `KMnO_4` respectively. How many ml of A must be added to 1 litre of B to make N/10 `KMnO_4` solution.

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