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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
Element in its highest oxidation state undergoes reduction and is oxidant.Element in its lowest oxidation state undergoes oxidation and is reductantElement in intermediate oxidation state is both oxidant and reductant.He is Inert element, it is neither an oxidant nor a reductant.