How many electrons are involved in the following redox reaction ?

${\text{Cr}}_{2} {\text{O}}_{7}^{2 -} + {\text{Fe}}^{2 +} + {\text{C}}_{2} {\text{O}}_{4}^{2 -} \to {\text{Cr}}^{3 +} + {\text{Fe}}^{3 +} + {\text{CO}}_{2}$ (Unbalanced)

Question

How many electrons are involved in the following redox reaction ? Cr _ 2 O _ 7 ^ 2 - + Fe ^ 2 + + C _ 2 O _ 4 ^ 2 - → Cr ^ 3 + + Fe ^ 3 + + CO _ 2 (Unbalanced)

Quantrex Academy · Accepted Answer

Correct answer: A. 6

[ F e ^ 2 + + C _ 2 O _ 4 ^ 2 - → F e ^ 3 + + 2C O _ 2 + 3 e ^ - ] × 2 ( oxidation ) C r _ 2 O _ 7 ^ 2 - + 14 H ^ + + 6 e ^ - → 2C r ^ 3 + + 7 H _ 2 O ( reduction ) _____________________________________________________ Cr _ 2 O _ 7 ^ 2 - + 2 Fe _ ^ 2 + + 2 C _ 2 O _ 4 ^ 2 - + 14H +→2 Cr ^ 3 + + 2 Fe ^ 3 + + 4 CO _ 2 + 7 H _ 2 O Hence, total 6 electrons are involved in the net redox reaction to happen.

How many electrons are involved in the following redox reaction ?...

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