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Chapter 19: Q19.92P (page 875)

How can a metal cation be at the centre of a complex anion?

Short Answer

Expert verified

A metal cation can be at the centre of a complex anion (in a ligand) so that the lone pairs can be donated to central metal ion.

Step by step solution

01

Introduction

An atom or a collection of atoms with a negative electric charge is known as an anion. An atom or a collection of atoms with a positive electric charge is known as a cation.

02

Cation at center of complex anion

Observe the Pt4 +metal iongiven below-

The dots around Pt4 +ion represent another atoms or molecules that could be bonded to it with coordinate bonds. These atoms and molecules are called ligands. One thing which all of these ligands have in common are active lone pairs in their outer shells which they can donate to central metal ion (they are acting as Lewis bases). A dative bond is formed between the central metal atom and the ligands.

Therefore, ligands have cation in between the complex anion.

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