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Question

The number of moles of K2Cr2O7 reduced by 3 mol of Sn2+ ions is :

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Solution

The redox changes are shown below:
6e+Cr2O272Cr3+
Sn2+Sn4++2e
Equivalent of Cr2O27= Equivalent of Sn2+
1 Eq. 1 Eq.

16 mol 12 mol

1 mol of Cr2O27=3 mol of Sn2+

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