Which one of the following forms with an excess of CN − (cyanide) a complex having coordination number two?

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Which one of the following forms with an excess of $\mathrm{CN}^{-}$(cyanide) a complex having coordination number two?

ChemistryCoordination CompoundsAIIMSAIIMS 2004

Options:

A $\mathrm{Cu}^{+}$
B $\mathrm{Ag}^{+}$
C $\mathrm{Ni}^{2+}$
D $\mathrm{Fe}^{2+}$

Solution:

2344 Upvotes Verified Answer

The correct answer is: $\mathrm{Ag}^{+}$

$\mathrm{Ag}^{+}$of $\mathrm{AgCN}$ is soluble in excess cyanide ion to form $\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}$complex.

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