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Question

Consider the following reaction: 6FeSO4+K2Cr2O7+7H2SO43Fe2(SO4)3+Cr2(SO4)3+K2SO4+7H2O. How many electrons are involved in the redox reaction?

A
9
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B
6
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C
3
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D
2
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Solution

The correct option is B 6
In acidic medium Cr is reduced from +6 to +3 as:
Cr2O72+14H++6e2Cr+3+7H2O
and Fe2+ is oxidised to Fe3+ as:
Fe2+Fe3++e
To balance the oxidation half reaction, we should multiply it by 6. So 6 electrons are involved in this reaction.

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