Q.

The number of electrons involved in the balanced half reaction Cr2O7-2→Cr+3 in acidic medium is

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a

3

b

6

c

5

d

10

answer is B.

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Detailed Solution

Cr2O7-2+14H++6e→2Cr3++7H2O ;(or)Oxidation state of Cr is decreasing from +6 to +3 per atom One Cr atom is gaining 3 e-sTwo Cr atoms gain 6 e- s
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The number of electrons involved in the balanced half reaction Cr2O7-2→Cr+3 in acidic medium is