The IUPAC name of $K_{2} [N i (C N)_{4}]$ and $K_{2} [N i (C l)_{4}]$ are:

potassium tetracyanonickelate(II), potassiumtetrachloronickelate(II)

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tetracyanopotassiumnickelate(II),tetrorachlropotassiumnickelate(II)

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tetracyanonickel(II), tetrachlornickel(II)

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potassium tetracyanonickel(II), potassiumtetrachloronickel(II)

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Solution

The correct option is B potassium tetracyanonickelate(II), potassiumtetrachloronickelate(II)
The oxidation number of Ni in both the compounds is- x-4=-2 $\to$ x=2
$K_{2} [N i (C N)_{4}]$ - potassium tetracyanonickelate(II)
$K_{2} [N i (C l)_{4}]$ - potassiumtetrachloronickelate(II)

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