Question

Which of the following statements is not correct?

• A. Non-spontaneous redox reactions can be used to produce electricity
• B. n-factor is change in oxidation state per molecule
• C. $Zn\left(s\right)\to Z{n}^{2+}\left(aq\right)+2e^{-}$ is an oxidation reaction
• D. Spontaneous redox reactions can be used to produce electricity

Answer 1

The correct option is A Non-spontaneous redox reactions can be used to produce electricity

Redox reaction is a type of chemical reaction that involves transfer of electrons between species.
It is a reaction in which oxidation and reduction take place simultaneously.
A process in which there is an increase in the oxidation number of the element from reactant to product in a chemical reaction is called oxidation.
A process in which there is a decrease in the oxidation number of the element from reactant to product in a chemical reaction is called reduction.

$Zn\left(s\right)\to Z{n}^{2+}\left(aq\right)+2e^{-}$
In given reaction oxidation of $Zn$ increase from zero to +2. Hence, it is a oxidation reaction.

n-factor is defined as the change in oxidation state per molecule. It is also known as valence factor.

Spontaneous redox reactions can be used to produce electricity
by separating the processes of oxidation (electron loss) and reduction (electron gain) and allowing them to occur in different physical locations of a system.

By reversing the process, electricity can be used to make non-spontaneous redox reactions to take place to generate useful products.
Such processes involved are described as electrochemical change and the study of these changes is called electrochemistry.