Chapter 23.3, Problem 1RCF

(a)

Interpretation Introduction

Interpretation:

The oxidation number of the metal centre in ${\text{[Co(H}}_{\text{2}}{\text{O)}}_{\text{6}}{\text{]Cl}}_{\text{3}}$ has to be determined.

Concept Introduction:

Oxidation number of an element represents the number of electrons gained or lost by that element in a particular chemical composition.  So, oxidation number is the charge possessed by the element.  All substance will have neutral charge in their elemental state.  Thus, the oxidation number of a substance in its elemental state will be zero.

The oxidation number of the metal centre can be found using the following guidelines:

• The charge of the counter ion has to be found.
• From that the net charge of the complex ion has to be determined.
• The charge of the ligands has to be known.
• The charge of the metal ion can be assumed as $\text{'x'}$.
• The sum of the charges inside the coordination sphere has to be equated with the net charge of the complex ion so as to determine the value of $\text{'x'}$which is the oxidation number of the central metal atom.

(b)

Interpretation Introduction

Interpretation:

The oxidation number of the metal centre in ${\text{K}}_{\text{4}}{\text{[MnCl}}_{\text{6}}\text{]}$ has to be determined.

Concept Introduction:

Refer part “(a)”.

(c)

Interpretation Introduction

Interpretation:

The oxidation number of the metal centre in ${\text{[Cr(en)}}_{\text{3}}{\text{]Br}}_{\text{3}}$ has to be determined.

Concept Introduction:

Refer part “(a)”.