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KCET2020Chemistryd and f Block Elements

For Cu ₂ Cl ₂ and CuCl ₂ in aqueous medium, which of the following statement is correct?

Options

  1. ACuCl ₂ is more stable than Cu ₂ Cl ₂
  2. BStability of Cu ₂ Cl ₂ is equal to stability of CuCl ₂
  3. CBoth are unstable
  4. DCu ₂ Cl ₂ is more stable than CuCl ₂

Correct answer

A. CuCl ₂ is more stable than Cu ₂ Cl ₂

Step-by-step solution

Out of Cu ₂ Cl ₂ and CuCl ₂ in aqueous medium, CuCl ₂ is more stable than Cu ₂ Cl ₂ as Cu ²⁺(a q) is more stable than Cu ⁺(a q) due to more negative enthalpy of hydration which compensates for the second ionisation enthalpy of Cu . In CuCl ₂, Cu is in Cu ²⁺ state and in Cu ₂ Cl ₂, Cu is in Cu ⁺ state

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