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Which one of the following species is not capable of showing dispropor

June 1, 2025 by rawan239

Which one of the following species is not capable of showing disproportionation reaction ?

ClO⁻

ClO₂⁻

ClO₃⁻

ClO₄⁻

This question was previously asked in

UPSC NDA-2 – 2016

Download PDF Attempt Online

ClO₄⁻ (Perchlorate) is not capable of showing disproportionation reaction.

Disproportionation is a redox reaction where an element in a specific oxidation state is simultaneously oxidized to a higher oxidation state and reduced to a lower oxidation state. For this to happen, the element must be in an intermediate oxidation state. In ClO₄⁻, Chlorine is in its highest common oxidation state of +7. It can only be reduced to a lower state (e.g., +5, +3, +1, 0, -1), but it cannot be oxidized further. Therefore, it cannot undergo disproportionation.

In ClO⁻ (+1), ClO₂⁻ (+3), and ClO₃⁻ (+5), Chlorine is in intermediate oxidation states and can be both oxidized and reduced, hence capable of disproportionation.

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