Question

Which process requires energy for a nonspontaneous redox reaction to occur? electrolysis?

Answer 1

In electrolysis, energy is required for a non-spontaneous redox reaction to occur.

Step-by-step explanation:

There are two kinds of electrochemical changes- (1) Chemical energy is converted to electrical energy and (2) electrical energy is converted to chemical energy

The first one occurs in galvanic cell and the second one occurs in electrolysis cell

In galvanic cell, spontaneous redox reaction occurs to produce a potential difference at two electrodes. This potential can be converted to energy by joining these two electrodes externally through a connector.

In electrolysis cell, non-spontaneous cell reactions are forced to occur by applying external electrical voltage.

Answer 2

Below diagram provides an example of non-spontaneous electrochemical reaction. In the attached example, NaCl is dissolved in water. Na may be deposited at cathode, and Cl2 must be evolved at anode.

However, this process is non-spontaneous in nature.

Non-spontaneous reaction are one which does not occur on their own and external source of energy is required for reaction to occur.

Such reactions are referred as electrolysis.