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Question

Which among the following acts as oxidising as well as reducing agent?

A
HNO2
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B
HNO3
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C
H2SO4
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D
KMnO4
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Solution

The correct option is A HNO2
Substance can acts as oxidising as well as reducing agent when it is present in its intermediate oxidation state.
Nitrogen in HNO2 is present in +3 oxidation state which is its intermediate state so it can acts as oxidising as well as reducing agent.
Nitrogen in HNO3 is present in +5 oxidation state which is its highest oxidation state so it cannot act as reducing agent.
Sulphur in H2SO4 is present in +6 oxidation state which is its highest oxidation state so it cannot act as reducing agent.
Mn in KMnO4 is present in +7oxidation state which is its highest oxidation state so it cannot act as reducing agent.

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