1.

Why a solution of [Ni(H_(2)O)_(6)]^(2+) is green while a solution of (Ni(CN)_(4)]^(2-) is colourless ?

Answer»

SOLUTION :`[Ni(H_(2)O)_(6)]^(2+)` is an octahedral COMPLEX while `[Ni(CN)_(4)]^(2-)` is a SQUARE planar complex. The two complexes are associated with different crystal field SPLITTING. The two compounds give different colours in d-d transition.


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