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Question

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


A

8

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B

4

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C

7

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D

24

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Solution

The correct option is D

24


Elemental metallic Aluminium carries an oxidation number of 0.
From the products, we see that 0Al becomes 3+Al3+.
Clearly, Aluminium is the reducing agent.

There are 8 Aluminium atoms on the left and they all become Al3+.
So overall, there are 24 electrons transferred.

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