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a
(I)-B ; (II)-A ; (III)-D ; (IV)-C
b
(I)-A ; (II)-B ; (III)-D ; (IV)-C
c
(I)-A ; (II)-B ; (III)-C ;(IV)-D
d
(I)-C ; (II)-B ; (III)-A ;(IV)-D
answer is A.
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Detailed Solution
(I) Cl2 undergoes both oxidation and reduction - Disproportionation(II) H2S(reductant) and SO2(oxidant) give same product - comproportionation(III) Decomposition of CaCO3 does not involve change in oxidation state in any element - not a redox reaction(IV) Decomposition of KMnO4 involves decrease in oxidation state of "Mn“ and increase in oxidation state of ”O" - intramolecular redox reaction