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Question

Equivalent mass of Cr2O72 in Cr2O72Cr3+ is Mx. Here, x is :

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Solution

The oxidation number of chromium changes from +6 to +3.
Hence, the change in the oxidation number per chromium atom is +3.
The change in the oxidation number of two chromium atoms is +6.
Thus, the equivalent weight of Cr2O72=MolarMass6.
Hence, x is 6.

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