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NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions

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Question : 47
Total: 49
Explain why Cu‌+ ion is not stable in aqueous solutions?
Solution:  
Cu‌+in aqueous solution undergoes disproportionation, i.e.,
2Cu‌+‌(aq) → Cu‌2+‌(aq)+ Cu(s)
The stability of Cu‌2+‌(aq) rather than Cu‌+‌(aq) is due to the much more negativeΔhydH° of Cu‌2+‌(aq) than Cu‌+, which more than compensates for the secondionisation enthalpy of Cu.
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