1.

Cu^(+) ion is not stable in aqueous solution because because of dispropotionation reaction. E^(@) value of disproportionation of Cu^(+) is [E_(Cu^(2+)//Cu^(+))^(@)=+ 0.15 V, E_(Cu^(2+)//Cu)^(@)=0.34 V]

Answer»

SECOND ionisation entyhalpy of copper is less than the first ionisation enthalpy
LARGE value of second ionisation enthalpy of copper is compensated by MUCH more negative hydration energy of `Cu_((aq))^(2+)`
hydration energy of `Cu_((aq))^(2+)` is much more negative than that of `Cu_((aq))^(2+)`
MANY copper (I) COMPOUNDS are unstable in aqueous solution and undergo disproportionation rection.

Answer :B


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