MCQ
Which salt is more stable in aqueous solution, $Cu ^{2+}$ salt or $Cu ^{+}$salt?
- A$Cu ^{+}$
- ✓$Cu ^{2+}$
- CBoth are equally stable
- DNone of the above
✓
Answer
Correct option: B.
$Cu ^{2+}$
(B)
The greater stability of $Cu ^{2+}( aq )$ rather than $Cu ^{+}$ (aq) is due to the much more negative $\Delta_{\text {hyd }} H$ of $Cu ^{2+}( aq )$ than $Cu ^{+}$, which more than compensates for the second ionisation enthalpy of Cu .
The greater stability of $Cu ^{2+}( aq )$ rather than $Cu ^{+}$ (aq) is due to the much more negative $\Delta_{\text {hyd }} H$ of $Cu ^{2+}( aq )$ than $Cu ^{+}$, which more than compensates for the second ionisation enthalpy of Cu .
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