MCQ
Which of the following compounds is not coloured ?
- A$Na_2[CuCl_4]$
- ✓$Na_2[CdCl_2]$
- C$K_4[Fe(CN)_6]$
- D$K_3[Fe(CN)_6]$
✓
Answer
Correct option: B.
$Na_2[CdCl_2]$
b
The outer shell electronic configuration of $Cu ^{2+}$ has $3 d ^9$ configuration and contain $1$ unpaired electron, thus it is coloured.
The outer shell electronic configuration of $Cu ^{2+}$ has $3 d ^9$ configuration and contain $1$ unpaired electron, thus it is coloured.
$Na _2\left[ CdCl _2\right]$, compound is not coloured because of central atom $Cd$ which has $4 d ^{10} 5 s ^2$ electronic configuration so transition do not occur.
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