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Question

Identify the reducing agent in the following redox reaction:

5SO23+2MnO4+6H+5SO24+2Mn2++3H2O


A

MnO4-

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B

SO42-

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C

SO32-

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D

Mn2+

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Solution

The correct option is C

SO32-


SO23 is the reducing agent because it loses two electrons, sulfur changes from an oxidation state of +4 in SO23​ to an oxidation state of +6 in SO24.


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