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

Which one of the following forms with an excess of $\mathrm{CN}^{-}$(cyanide) a complex having coordination number two?
  1. $\mathrm{Cu}^{+}$
  2. $\mathrm{Ag}^{+}$
  3. $\mathrm{Ni}^{2+}$
  4. $\mathrm{Fe}^{2+}$

Solution

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

Asked in: NEET 2007

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