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Oxides and Oxoanions

Cr2O72-→ 2Cr3...

Question

$C r_{2} O_{7}^{2 -} \to 2 C r^{3 +}$
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 $6$
${+ 6 C r}_{2} O_{7}^{2 -} \to 2 C r^{+ 3}$
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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