Chapter 19.1, Problem 4PP

(a)

Interpretation Introduction

Interpretation:

In the given redox reaction, oxidizing and reducing agent are to be identified.

Concept introduction:

Oxidizing agent: It is the species which it self is oxidized.

Reducing agent: It is the species which it self is reduced.

Answer to Problem 4PP

Oxidizing agent: $I_2$

Reducing agent: $Mg$

Explanation of Solution

The given reaction is:

$Mg+I_2\to Mg{I}_2$

• Magnesium involves addition of electronegative element and $I_2$ involves addition of electropositive element. Thus $Mg$ is oxidized, it self behaving as reducing agent and $I_2$is reduced, it self behaving as oxidizing agent.

(b)

Interpretation Introduction

Interpretation:

In the given redox reaction, oxidizing and reducing agent are to be identified.

Concept introduction:

Oxidizing agent: It is the species which it self is oxidized.

Reducing agent: It is the species which it self is reduced.

Answer to Problem 4PP

Oxidizing agent: $C{l}_2$

Reducing agent: $H_{2}S$

Explanation of Solution

The given reaction is:

$H_{2}S+C{l}_2\to S+2HCl$

• $H_{2}S$ involves removal of hydrogen and $C{l}_2$ involves addition of hydrogen. Thus $H_{2}S$ is oxidized, it self behaving as reducing agent and $C{l}_2$ is reduced, it self behaving as oxidizing agent.