Chapter 17.3, Problem 17.3PSP

(a)

Interpretation Introduction

Interpretation:

The oxidation half cell and the reduction half cell for the given unbalance redox reactions is to be written.

Concept Introduction:

When the oxidation state of a substance increases by losing electrons, it is termed as an oxidation. The half cell reaction taking place at the electrode on which oxidation occurs is the oxidation half cell reaction And when the oxidation state of a substance decreases by gaining electrons, it is termed as a reduction.  The half cell reaction taking place at the electrode on which reduction occurs is the reduction half cell reaction

(b)

Interpretation Introduction

Interpretation:

The electrodes at which oxidation and reduction is taking place is to be named.

Concept Introduction:

The oxidation half cell reaction takes place at anode and the reduction half cell takes place at cathode.

(c)

Interpretation Introduction

Interpretation:

The direction of flow of electrons in an external wire and electrical device connected between the electrodes is to be determined.

Concept Introduction:

In an electrochemical cell, the substance present on anode loses its electrons and gets oxidized and the substance present on cathode takes up these electrons and gets reduced.

(d)

Interpretation Introduction

Interpretation:

The direction of flow of ions in the given salt bridge is to be determined.

Concept Introduction:

A salt bridge in an electrochemical cell consists of an inert electrolyte like $\text{KCl}$.

It is generally used to connect the two halves of the electrochemical cell to one another.

It prevents the chemical reaction to reach equilibrium supplying the required ions and hence, help in maintaining neutrality.