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JIPMER 2005
Exam
JIPMER
Year
2005
Subject
Chemistry
Chapter
d and f Block Elements

JIPMER 2005 · Chemistry · d and f Block Elements

In [NiCl_4]^ 2- , the number of unpaired electrons, are

In [NiCl4]2−\left[\mathrm{NiCl}_4\right]^{2-}, the number of unpaired electrons, are

Options

  1. A4
  2. B2
  3. C3
  4. D5

Correct answer

B. 2

Step-by-step solution

\operatorname{In}[NiCl4]2−\left[\mathrm{NiCl}_4\right]^{2-} the oxidation number of Ni is +2+2 Electronic configuration of Ni  (at no. =28)Ni=[Ar]3d84s2Ni+2=[Ar]3d8\begin{aligned} &\text{ (at no. }=28) \\ & \mathrm{Ni}=[\mathrm{Ar}] 3 d^8 4 s^2 \\ & \mathrm{Ni}^{+2}=[\mathrm{Ar}] 3 d^8\end{aligned} or [Ar]\quad[\mathrm{Ar}] ↑↓↑↓↑↓↑↑\begin{array}{|c|c|c|c|c|} \hline\uparrow \downarrow & \uparrow \downarrow & \uparrow \downarrow & \uparrow & \uparrow \\ \hline \end{array} It is evident that in [NiCl4]2−\left[\mathrm{NiCl}_4\right]^{2-} the number of unpaired electrons are two.
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