Which one acts as both oxidising as well as reducing agent?
A
HNO3
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B
HNO2
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C
H2SO4
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D
HCl
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Solution
The correct option is B
HNO2
In HNO2 , Oxidation number of nitrogen is +3 .So, it can easily increase or decrease its oxidation state.Thus it acts both as an oxidising and reducing agent.