Q. Which one of the following has square planar structure?
A) $\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -}$
B) $\lbrack Ni(CO)_{4}\rbrack$
C) $\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}$
D) All of these
Explanation
(a)
$Ni(CN)_{4}^{2 -}$
Ni(G. S.) 3$d$ 4$s$ 4$p$
[table] ⥮ | ⥮ | ⥮ | $\upharpoonleft$ | $\upharpoonleft$ | | ⥮ | | | | [/table]
$Ni^{2 +}$ 3$d$ 4$s$ 4$p$
[table] ⥮ | ⥮ | ⥮ | $\upharpoonleft$ | $\upharpoonleft$ | | | | | | [/table]
[image:9_image238.emf]
$Ni(CN)_{4}^{2 -}$
Ni is in +2 oxidation state.
[image:9_image239.emf]
$Ni(CO)_{4}$
Oxidation state of Ni is zero
$Ni^{(0)}$ 3$d$ 4$s$ 4$p$
[table] ⥮ | ⥮ | ⥮ | $\upharpoonleft$ | $\upharpoonleft$ | | ⥮ | | | | [/table]
[image:9_image240.emf]
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.