Question:

$CuSO_4$ reacts with $KCN$ solution and forms

Updated On: Jul 28, 2022
  • $K _{3}\left[ Cu ( CN )_{4}\right]$
  • $Cu ( CN )$
  • $Cu ( CN )_{2}$
  • $K _{4}\left[ Cu ( CN )_{6}\right]$
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The Correct Option is A

Solution and Explanation

$CuSO_{4} + 2KCN \to Cu\left(CN\right)_{2} + K_{2}SO_{4}$ $2Cu\left(CN\right)_{2} \to Cu_{2} \left(CN\right)_{2} + \left(CN\right)_{2}$ $Cu_{2} \left(CN\right)_{2} + 6KCN \to 2K _{3} \left[Cu\left(CN\right)_{4} \right]$ $2CuSO_{4} + 10KCN \to 2K_{3}Cu\left(CN\right)_{4} + 2K_{2}SO_{4} + \left(CN\right)_{2}$
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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.