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Why is Cu^2+ (aq) more stable than Cu+ (aq) although energy is required to transform Cu^+ to Cu^2+?

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Why is Cu2+(aq) more stable than Cu+(aq) although energy is required to transform Cu+ to Cu2+? 

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Cu2+(aq) is more stable than Cu+(aq) due to higher value of negative ΔhydrH Θ of Cu2+ (aq) than that of Cu+ (aq) which is sufficiently high to compensate (ΔiH)2 of Cu. Also Cu+ (aq) undergoes disproportionation reaction to form more stable 

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