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Question

Number of moles of ferrous sulphate oxidised by 1 mole of potassium permanganate in acidic medium is:

A
25
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B
52
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C
15
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D
5
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Solution

The correct option is D 5
The reaction between Ferrous sulphate & potassium permanganate is given as :
2KMnO4+8H2SO4+10FeSO4K2SO4+2MnSO4+8H2O+5Fe(SO4)3
Therefore, by stiochiometry,
2 moles of KMnO410 moles of FeSO4
Therefore, 1 mole of KMnO45 moles of FeSO4
Therefore, 5 moles of ferrous sulphate are oxidized by 1 mole of potassium permanganate in acidic medium.

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