Chapter 21, Problem 1STP

Interpretation Introduction

Interpretation: The statement that describes electrolysis needs to be identified.

Concept Introduction: In electrolytic cells, an electric current makes a non-spontaneous redox reaction to take place. The process by which electrical energy is converted to chemical energy is known as electrolysis.

Explanation of Solution

Reason for the correct option:

In an electrolytic cell where electrolysis takes place, the anode is a positive electrode and it is connected to the negative terminal of the battery. Here, the cathode is a negative electrode connected to the positive terminal of the battery. Here, positive ions move toward the negative electrode which is the cathode. Therefore, option (D) is correct.

Conclusion

Reason for incorrect option/s:

In electrolysis, there are two electrodes; anode and cathode. Here, oxidation takes place at the anode and reduction at the cathode. Thus, options (A) and (C) are incorrect.

In the electrolysis process, electrical energy is converted to chemical energy thus, energy is utilized not produced. Therefore, option (B) is incorrect.