1.

Cu^+ ion is not stable in aqueous solution because of diproportionation reaction . E^(@)value for the disproportionation of Cu^(+) is : (E_(cu^(2+)// cu^+)^(@) = + 0.15 V , E_(cu^(+) // cu)^(@)= + 0.34 V )

Answer»

`Cu_((aq))^(+2)` is more STABLE than `Cu_((aq))^(+)`
`Cur_((aq))^(+2)`can form INTERSTITIAL compounds in aqueous solution
The equilibrium CONSTANT for `Cu_((aq))^(+) hArr Cu_((aq))^(+2) + Cu` is very high
The equilibrium constant for `Cu_((aq))^(+2) hArr Cu_((aq))^(+2) = Cu` is very low

Solution :`Cu^(+2)` is more stable is aqueous MEDIUM due to hydration energy


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