Chapter 22, Problem 22.68QP

Interpretation Introduction

Interpretation:

The reason for colorless nature of the complex ion ${\left[Zn{\left(H_{2}O\right)}_4\right]}^{2+}$ has to be explained.

Concept Introduction:

Co-ordination compounds are primarily formed by transition elements which are d-block elements.  A co-ordination compound is known as a complex compound is made of metal atom/ion and ligand(s).  Ligands are considered as Lewis bases and the central metal atom is Lewis acid.  Ligands donate a pair of electron to metal ion and establish bonding with metal ion which is known as co-ordinate bond and hence these compounds are named as co-ordination compounds.  The ligands represented inside the square brackets adjacent to the central metal ion, which is termed as co-ordination sphere.

Many of the complex compounds are due to the presence of unpaired electrons in d-orbital of metal ion and exchange of energy between them.