Question:

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

Updated On: Jul 27, 2022
  • $Cu ^{+}$
  • $Ag ^{+}$
  • $Ni ^{2+}$
  • $Fe ^{2+}$
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The Correct Option is B

Solution and Explanation

Among the given metal ions only $Ag ^{+}$forms complex with $CN ^{-}$having co-ordination number $2$ . $Ag ^{+}+2 CN ^{-} \longrightarrow\left[ Ag ( CN )_{2}\right]^{-}$ Coordination number of metals is defined as the number of $\sigma$ bonds by which ligands are attached to the metal atom.
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Concepts Used:

Coordination Compounds

A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.

Coordination entity:

A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.

Ligands:

A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.