Chapter 20, Problem 58A

(a)

Interpretation Introduction

Interpretation: Whether the given reaction, $B{i}_2{O}_3\left(s\right)+3C\left(s\right)\to 2Bi\left(s\right)+3CO\left(g\right)$ is a redox reaction or not is to be determined.

Concept Introduction: The reaction that involves the oxidation and reduction process is a redox reaction. Oxidation involves the loss of electrons while reduction involves a gain of electrons.

Answer to Problem 58A

The given reaction is a redox reaction since it involves both the oxidation and reduction processes.

Explanation of Solution

The given reaction,

  $B{i}_2{O}_3\left(s\right)+3C\left(s\right)\to 2Bi\left(s\right)+3CO\left(g\right)$

It involves the oxidation of $B{i}^{2+}$ and the reduction of C. The half-reaction is,

Oxidation: $B{i}_2{O}_3+6e^{-}\to Bi$

Reduction: $3C\to 3CO+6e^{-}$

So, it involves both oxidation and reduction processes it is a redox reaction.

(b)

Interpretation Introduction

Interpretation: Whether the given reaction, $C{r}_2{O}_3\left(s\right)+3H_{2}S\left(s\right)\to C{r}_2{S}_3\left(s\right)+3H_{2}O\left(l\right)$ is a redox reaction or not is to be determined.

Concept Introduction: The reaction that involves the oxidation and reduction process is a redox reaction. Oxidation involves the loss of electrons while reduction involves a gain of electrons.

Answer to Problem 58A

The given reaction is not a redox reaction since it doesn't involve oxidation and reduction processes.

Explanation of Solution

The given reaction,

  $C{r}_2{O}_3\left(s\right)+3H_{2}S\left(s\right)\to C{r}_2{S}_3\left(s\right)+3H_{2}O\left(l\right)$

It doesn't involve any change in oxidation number. The oxidation state of Cr is +3 on the reactant and product side. So, it is not a redox reaction.

(c)

Interpretation Introduction

Interpretation: Whether the given reaction, $BC{l}_3\left(g\right)+3H_{2}O\left(l\right)\to H_{3}B{O}_3\left(s\right)+3HCl\left(g\right)$ is a redox reaction or not is to be determined.

Concept Introduction: The reaction that involves the oxidation and reduction process is a redox reaction. Oxidation involves the loss of electrons while reduction involves a gain of electrons.

Answer to Problem 58A

The given reaction is not a redox reaction since it doesn't involve oxidation and reduction processes.

Explanation of Solution

The given reaction,

  $BC{l}_3\left(g\right)+3H_{2}O\left(l\right)\to H_{3}B{O}_3\left(s\right)+3HCl\left(g\right)$

It doesn't involve any change in oxidation number. The oxidation state of B is +3 on the reactant and product side. So it is not a redox reaction.