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JEE Main levelOne or more correct optionsDifficulty 2 of 3rx059

Select ALL species that can act ONLY as reducing agents (judge by the oxidation state of the non-hydrogen element).

A $I X^{-}$
B $Cr X_{2} O X_{7} X^{2 -}$
C $MnO X_{4} X^{-}$
D $S X^{2 -}$

Answer: A, D

A species is only a reductant when its element is already at its lowest oxidation state.

I X^{-}

(-1) and

S X^{2 -}

(-2) are at their minimum values.

Cr X_{2} O X_{7} X^{2 -}

(Cr +6) and

MnO X_{4} X^{-}

(Mn +7) are at their maximum values and act only as oxidants.

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