Why `Zn^(2+)` salts are white while `Ni^(2+)` salts or`Cu^(2+)` salts – InterviewSolution

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1.	Why `Zn^(2+)` salts are white while `Ni^(2+)` salts or`Cu^(2+)` salts are blue ?
Answer» `Zn^(2+)` has completely filled d-orbitals `( 3d^(10))` while `Ni^(2+)` has incompletely filled d-orbitals`( 3d^(8))` or `Cu^(2+)` has `3d^(9)`.Hence, d-d transiton can take place in `Ni^(2+)` salts or `Cu^(2+)` saltsbut not in `Zn^(2+)` salts.

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