JEE Main 2025 Jan 22 Shift 2, Chemistry Q6: Oxidation and Reduction

JEE Main2025Jan 22, Shift 2Chemistry

The species which does not undergo disproportionation reaction is :

A
$C l O_{2}^{-}$
B
$C l O_{4}^{-}$
C
$C l O^{-}$
D
$C l O_{3}^{-}$

Solution

Disproportionation requires that the central atom is in an intermediate oxidation state, so it can simultaneously be oxidised and reduced.

Oxidation state of Cl in each species:

$C l O^{-}$ : $+ 1$ ; $C l O_{2}^{-}$ : $+ 3$ ; $C l O_{3}^{-}$ : $+ 5$ ; $C l O_{4}^{-}$ : $+ 7$ .

For $C l O_{4}^{-}$ : $x + 4 (- 2) = - 1 \Rightarrow x = + 7$ , which is the maximum oxidation state of chlorine. Chlorine cannot be oxidised any further, so further oxidation is impossible and disproportionation cannot occur.

$∴$ $C l O_{4}^{-}$ does not disproportionate.

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JEE Main 2025 Jan 22 Shift 2, Chemistry Q6: Oxidation and Reduction

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