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The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
Question
Explain why Cu+ ion is not stable in aqueous solutions?
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Answer

In an aqueous medium, Cu2+ is more stable than Cu+. This is because although energy is required to remove one electron from Cu+ to Cu2+, high hydration energy of Cu2+ compensates for it. Therefore, Cu+ ion in an aqueous solution is unstable. It disproportionate to give Cu2+ and Cu.
$2\text{Cu}^+_{(\text{aq})}\rightarrow\text{Cu}^+_{(\text{aq})}+\text{Cu}_{(\text{s})}$

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