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Cu + in aqueous solution undergoes disproportionation i.e., 2Cu + (aq) → Cu 2+ (aq) + Cu(s) The E°, value for this is favourable.

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Cu⁺ in aqueous solution undergoes disproportionation i.e.,
2Cu⁺(aq) → Cu²⁺(aq) + Cu(s)
The E°, value for this is favourable.

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