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Question

Cr2O272Cr3+
How many electrons are gained during the given reaction?

A
3
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B
12
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C
6
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D
10
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Solution

The correct option is C 6
+6Cr2O272Cr+3
Oxidation state of chromium changes from +6 to +3 i.e. addition of 3 electrons are taking place per atom.
Since two atom is involved so total of 6 electrons are gained.

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