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Q.

In which one of the following changes there is a transfer of one electrons ?

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a

MnO4-  →  Mn2+

b

CrO42  →  Cr3+

c

MnO4-  →  MnO42-

d

Cr2O72-  →  2Cr3+

answer is C.

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Detailed Solution

Mn+7O4-  →  Mn+6O42--....gain of 1 mole of electrons
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