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State whether the following is true or false: In aqueous solution, Cu+ undergoes disproportionation to give Cu2+ and metallic copper.

1. True
2. False
3. Only at high temperature
4. Only in non-aqueous medium

Correct answer: True

Solution

Cu+ is unstable in water because the large hydration energy of Cu2+ more than compensates the second ionisation energy, making 2Cu+ -> Cu2+ + Cu spontaneous.

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