The d-And-f-Block Elements

The d-And-f-Block Elements

Question

Out of Cu+ and Cu2+, which ion is unstable in aqueous solution and why?

Answer

Cu+2 is more stable in aqueous solution because of more hydration energy which compensates to the ionization energy of Cu+2 →Cu+1.
Cu+1 in aqueous solution undergoes disproportionation reaction.
2Cu+→ Cu + Cu2+

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