The coordination number of \( \mathrm{Ni}^{+2} \) is \( =4 \) \( \mathrm{P} \) \( \mathrm{NiCl}_...

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The coordination number of \( \mathrm{Ni}^{+2} \) is \( =4 \)
\( \mathrm{P} \) \( \mathrm{NiCl}_{2}+\mathrm{KCN} \) (Complex) \( \rightarrow \mathrm{A} \) (Complex)

W
- A + Conc. \( \mathrm{HCl} \) (Maximun) \( \rightarrow \mathrm{B} \) (Chloro complex)
The IUPAC name of \( \mathrm{A} \) and \( \mathrm{B} \) are
(1) potassium tetracyanonickelate(II), potassium tetrachloronickelate(II),
(2) tetracyanopotassiumnickelate(II), tetrachloro potassiumnickelate (II),
(3) tetracyanonickel (II), tetrachloronickel (II)
(4) potassiumtetracyanonickel (II),
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