Class 12th Chemistry 2017 Set1 Delhi Board Paper Solution

Question 24

Out of Cu+ and Cu2+, which ion is unstable in aqueous solution and why?

Answer

Cu+  is unstable in aqueous solution than Cu2+ because although 2nd I.E. of copper is large but hydration enthalpy for Cu2+ is much more negative than that for Cu+ and hence, it is more than compensates for the 2nd I.E. of copper. Therefore, many Cu+ compounds are unstable in aqueous solution and undergo disproportionation.

2Cu+  →  Cu2+ + Cu

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