Q 2337078882.     The coordination number of `Ni^(2+)` is `4`.

`NiCl_2 + KCN` (excess) `->` `A` (cyano complex)

`NiCl_2 +` conc. `HCl` (excess) `->` `B` (chloro complex)
The IUPAC name of A and B are

JEE 2006
A

potassiumtetracyanonickelate `(II)`, potassium tetrachloronickelate `(II)`

B

tetracyanopotassiumnickelate `(II)`, tetrachloropotassiumnickelate `(II)`

C

tetracyanonickel `(II)`, tetrachloronickel `(II)`

D

potassiumtetracyanonickel `(II)`, potassium tetrachloronickel `(II)`

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