Which of the following forms with an excess of $C N^{-}$ , a complex having coordination number two?

C u^{2 +}

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A g^{+}

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N i^{2 +}

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F e^{2 +}

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Solution

The correct option is C $A g^{+}$
$A g^{+}$ forms complex compound in excess of $C N^{-}$ .
Reaction: $A g^{+} + 2 C N^{-} \to A g (C N)_{2}^{-}$ complex with linear structure (sp hybridization).

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