Out of Cu2Cl2 and CuCl2,

Question:

 Out of Cu2Cl2 and CuCl2, which is more stable and why?

Solution:

CuCl2 is more stable because Cu2+ has a higher electron density than Cu+. Cu2+ is smaller in size, has higher effective nuclear charge and therefore a higher hydration enthalpy ∆hyd of Cu2+, which makes it more stable.

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