Equivalent mass of Cr2O72− in Cr2O72−→Cr3+ 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.