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JEE Main levelSingle correct optionDifficulty 2 of 3rx082

Considering only the oxidation state of chlorine, which of the following ions CANNOT act as a reducing agent?

A $Cl X^{-}$
B $ClO X_{3} X^{-}$
C $ClO X^{-}$
D $ClO X_{4} X^{-}$

Answer: D

A reducing agent must have an element that can be raised to a higher oxidation state. Cl in

ClO X_{4} X^{-}

is +7, the maximum, so it cannot be oxidised.

ClO X_{3} X^{-}

(+5),

ClO X^{-}

(+1) and

Cl X^{-}

(-1) can all be oxidised.

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