Which of the following involves gain of ...

Which of the following involves gain of five electrons ?

A

`MnO_(4)^(-) rarr Mn^(2+)`

B

`CrO_(4)^(2-) rarr Cr^(3+)`

C

`MnO_(4)^(2-) rarr MnO_(2)`

D

`Cr_(2)O_(7)^(2-) rarr 2Cr^(3+)`

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The correct Answer is:

A

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