A) The complexes\[{{[NiC{{l}_{4}}]}^{2-}}\]and\[{{[Ni{{(CN)}_{4}}]}^{2-}}\] differ in the state of hybridization of nickel
B) The complexes\[{{[NiC{{l}_{4}}]}^{2-}}\]and\[{{[Ni{{(CN)}_{4}}]}^{2-}}\] differ in the magnetic properties
C) The complexes\[{{[NiC{{l}_{4}}]}^{2-}}\]and\[{{[Ni{{(CN)}_{4}}]}^{2-}}\] differ in geometry
D) The complexes\[{{[NiC{{l}_{4}}]}^{2-}}\]and\[{{[Ni{{(CN)}_{4}}]}^{2-}}\]differ in primary valencies of nickel
E) Nickel ion has the same secondary valency in the complexes\[{{[NiC{{l}_{4}}]}^{2-}}\]and\[{{[Ni{{(CN)}_{4}}]}^{2-}}\]
Correct Answer: D
Solution :
The primary valencies of\[Ni,\]in the complexes \[{{[Ni(C{{l}_{4}})]}^{2-}}\]and\[{{[Ni(C{{N}_{4}})]}^{2-}}\]is same ie,\[(+\text{II})\]. Primary valencies are those valencies in which a metal exhibits in the formation of its simple salt, these are non-directional. It is also referred as oxidation state of central metal atom.
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