JEE MainChemistryd and f Block Elements
Consider the following list of copper compounds and complexes: Cu ₂ Cl ₂ , Cu ₂ O , CuO , CuSO ₄ , K ₃[ Cu ( CN )₄] , [ Cu ( H ₂ O )₆] Cl ₂ The number of species in which the copper ion has a 3d¹⁰ electronic configuration is
Correct answer
3
Step-by-step solution
The electronic configuration of neutral Cu is [ Ar ] 4s^1 3d¹⁰ . A fully filled d-subshell ( 3d¹⁰ ) corresponds to the Cu ( I ) oxidation state. For Cu ( II ) , the configuration is 3d^9 . Let us determine the oxidation state of copper in each given species: 1. Cu ₂ Cl ₂ : Oxidation state is +1 2. Cu ₂ O : Oxidation state is +1 3. CuO : Oxidation state is +2 4. CuSO ₄ : Oxidation state is +2 5. K ₃[ Cu ( CN )₄] : Let the oxidation state be y . 3(+1) + y + 4(-1) = 0 y = +1 6. [ Cu ( H ₂ O )₆] Cl ₂ : Oxidation state