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Question

In the reaction, 8Al+3Fe3O44Al2O3+9Fe, number of electrons transferred from reductant to oxidant is:

A
8
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B
4
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C
16
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D
24
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Solution

The correct option is D 24
On balancing the charges of two half-reactions we get
8Al8Al3++24e (Oxidation half)9Fe83++24e9Fe (Reduction half)
Hence, 24 electrons are transferred from reductant to oxidant.

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