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a
A - 4 B - 3 C - 1 D - 5
b
A - 2 B - 4 C - 1 D - 3
c
A - 4 B - 1 C - 2 D - 3
d
A - 3 B - 2 C - 1 D - 4
answer is C.
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Detailed Solution
NH3Ox. state of nitrogen = -3This is the least Ox. state of nitrogen(Group.No-8)∴NH3 can act like reductant but never act like OxidantKMnO4Ox. state of 'Mn' = +7This is the highest Ox. state of 'Mn' (group.No)∴KMnO4 can act like oxidant but never act like reductantSO2Ox. state of sulphur = +4This is the intermediate Ox. state of sulphur (between - 2 & +6)∴SO2 can act like both oxidant (Or) reductantHeNeither oxidant nor reductant