Chapter 19.1, Problem 8PP

Interpretation Introduction

(a)

Interpretation:

The net change of oxidation number of each element in given redox reaction is to be calculated.

Concept introduction:

Oxidation number: It is defined as charge the atom would have if electrons are not shared but transfer completely.

Answer to Problem 8PP

Change in oxidation number of $C=+4$

Change in oxidation number of $O=-2$

Explanation of Solution

The oxidation number of elements involved in reaction is:

$\stackrel{0}{C}+\stackrel{0}{O_2}\to \stackrel{+4}{C}{\stackrel{-2}{O}}_2$

Therefore,

Change in oxidation number of $C=+4$

Change in oxidation number of $O=-2$

Interpretation Introduction

(b)

Interpretation:

The net change of oxidation number of each element in given redox reaction is to be calculated.

Concept introduction:

Oxidation number: It is defined as charge the atom would have if electrons are not shared but transfer completely.

Answer to Problem 8PP

Change in oxidation number of $I=+1$

Change in oxidation number of $Cl=-1$

Explanation of Solution

The oxidation number of elements involved in reaction is:

$\stackrel{0}{C}{l}_2+\stackrel{+2}{Zn}{\stackrel{-1}{I}}_2\to \stackrel{+2}{Zn}{\stackrel{-1}{Cl}}_2+{\stackrel{0}{I}}_2$

Therefore,

Change in oxidation number of $I=+1$

Change in oxidation number of $Cl=-1$

Interpretation Introduction

(c)

Interpretation:

The net change of oxidation number of each element in given redox reaction is to be determined.

Concept introduction:

Oxidation number: It is defined as charge the atom would have if electrons are not shared but transfer completely.

Answer to Problem 8PP

Change in oxidation number of $C=+2$

Change in oxidation number of $Cd=-2$

Explanation of Solution

The oxidation number of elements involved in reaction is:

$\stackrel{+2}{C}\stackrel{-2}{O}+\stackrel{+2}{Cd}\stackrel{-2}{O}\to \stackrel{+4}{C}{\stackrel{-2}{O}}_2+\stackrel{0}{Cd}$

Therefore,

Change in oxidation number of $C=+2$

Change in oxidation number of $Cd=-2$