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Question

In the reaction of sulphur dioxide and hydrogen sulphide, identify the reducing agent and choose it.

A
Sulphur dioxide
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B
Hydrogen sulphide
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C
Water
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D
Sulphur
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Solution

The correct option is B Hydrogen sulphide
The reaction between sulphur dioxide and hydrogen sulphide is as follows:

SO2+2H2S2H2O+3S

From this reaction we can see that SO2 is getting reduced i.e., oxygen atoms are removed which indicates that SO2 is an oxidising agent.
Whereas H2S is getting oxidised i.e., removal of hydrogen. So, H2S is a reducing agent.

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