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A sample of MnSO4.4H2O is reacted in air...

A sample of `MnSO_4.4H_2O` is reacted in air to give `Mn_3O_4`. The residue `Mn_3O_4` is dissolved in 100 " mL of " `(N)/(12)FeSO_4` containing `H_2SO_4` The solution reacts completely with 50 " mL of " `KMnO_4`. 25 " mL of " this `KMnO_4` requires 30 " mL of " `(N)/(10)FeSO_4` for complete oxidation determine the amount of `MnSO_4.4H_2O` in the sample.

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The correct Answer is:
`1.338` gm
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