Equivalent weight of MnO−4 when it changes to MnO2 in concentrated basic medium is ?
A
1/3
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B
1/4
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C
1/5
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D
1/6
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Solution
The correct option is A 1/3 Equivalent weight of MnO−4 when it changes to MnO2 in concentrated basic medium is one-third of molar mass. The oxidation number of Mn changes from +7 (in MnO−4) to +4 (in MnO2). The net change in the oxidation number is +3. Equivalent weight is the ratio of the molar mass to the change in the oxidation number.