Which compound acts as an oxidising as well as reducing agent
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a
SO2
b
MnO2
c
Al2O3
d
CrO3
answer is A.
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Detailed Solution
The minimum and maximum oxidation number of Sare -2 and +6 respectively. Since the oxidation number of S in SO2 is +4, therefore it can be either increased or decreased. Therefore SO2 behaves both as an oxidising as well as reducing agent.