LIST-1 LIST-2
A) NH₃ a) Oxidant
B) KMnO₄ b) Both oxidant and reductant
C) SO₂ c) Neither oxidant nor reductant
D) He d) Reductant
e) Dehydrating agent
The correct match is
A B C D
1) d c a e
2) b d a c
3) d a b c
4) c b a d

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answer is C.

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Detailed Solution

In NH₃, there is a lone pair of electrons on N atom. Hence, it is capable to donate electrons and can itself gets oxidized. Hence, NH₃ acts as reductant.
In KMnO₄, oxidation state of Mn is +7. As Mn already present in its highest oxidation state, therefore it can reduced and hence, acts as oxidant.
Oxidation state of S in SO₂is +4. Possible oxidation of S ranges from -2 to +6, hence acts as both both oxidant and reductant.
Helium is a noble gas and has zero oxidation state. This means that it neither acts as oxidant nor reductant.

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