MCQ
Of the following complex ions, which is diamagnetic in nature?
- A$[NiCl_4]^{2-}$
- ✓$[Ni(CN)_4]^{2-}$
- C$[CuCl_4]^{2-}$
- D$[CoF_6]^{3-}$
✓
Answer
Correct option: B.
$[Ni(CN)_4]^{2-}$
b
Electronic configuration of $N i^{2+}\; i n\;\left[N i(C N)_{4}\right]^{2-}$ is $N i^{2+}=3 d^{8} 4 s^{0}$
Electronic configuration of $N i^{2+}\; i n\;\left[N i(C N)_{4}\right]^{2-}$ is $N i^{2+}=3 d^{8} 4 s^{0}$
$\therefore\left[N i(C N)_{4}\right]^{2-}$ is diamagnetic (because of the absence of unpaired electrons).
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