Coordination CompoundHard
Question
Which of the following statements is not correct?
Options
A.Ti(NO3)4 is a colourless compound.
B.[Cr(NH3)6)]Cl3 is a coloured compound.
C.K3[VF6] is a colourless compound.
D.[Cu(NCCH3)4][BF4] is a colourless compound.
Solution
(A) Ti(NO3)4, [Ar]18 3d0 4s0 ; there is no unpaired electron and, therefore, there is no d-d transition of electron. So compound is colourless.
(B) [Cr(NH3)6)]Cl3, [Ar]18 3d3 ; there is three unpaired electrons and, therefore, there is d-d transition of electron. So compound is coloured.
(C) K3[VF6], [Ar]18 3d1 ; there is one unpaired electron and, therefore, there is d-d transition of electron. So compound is coloured.
(D) [Cu(NCCH3)4][BF4] [Ar]18 3d10 ; there is no unpaired electron and, therefore, there is no d-d transition of electron. So compound is colourless.
(B) [Cr(NH3)6)]Cl3, [Ar]18 3d3 ; there is three unpaired electrons and, therefore, there is d-d transition of electron. So compound is coloured.
(C) K3[VF6], [Ar]18 3d1 ; there is one unpaired electron and, therefore, there is d-d transition of electron. So compound is coloured.
(D) [Cu(NCCH3)4][BF4] [Ar]18 3d10 ; there is no unpaired electron and, therefore, there is no d-d transition of electron. So compound is colourless.
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