CBSE Class 12 Chemistry 2023 Delhi Set 3 Solved Paper

Question : 12

Total: 13

SECTION - C

(b) A solution of [Ni(H2O)6]2+ is green but a solution of [Ni(CO)4] is colourless. Explain.
[Atomic number: mathrm‌Ni=28 ]

Solution: 👈: Video Solution

(b) In [Ni(H2O)6]2+Ni has configuration of 3d8.
The two unpaired electrons do not pair up in presence of weak H2O ligand, but in [Ni(CO)4] due to presence of strong CO ligand, it pairs up. As there is unpaired electron in [Ni(H2O)6]2+ it is coloured and [Ni(CO)4] is colourless, due to absence of unpaired electrons.

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