Chapter 18, Problem 15A

Interpretation Introduction

Interpretation: The meaning of the two definition of reduction needs to be explained.

Concept introduction: Redox reaction occurs between metals and non metals that involves transfer of electrons from metal to non metal.

Answer to Problem 15A

Reduction is loss of electrons. Reduction of chlorine is as follows:

$\text{Cl}\to {\text{Cl}}^{-}-e^{-}$

Explanation of Solution

There are two ways to define reduction: atom gains negative charge while it gains electrons and oxidation state decreases when atom gains electrons. Both are same as when an atom decreases its oxidation state, it gains electrons. For example oxidation state of chlorine decreases from 0 to -1.

$\text{Cl}\to {\text{Cl}}^{-}-e^{-}$

Conclusion

Oxidation − reduction reaction is a chemical reaction which involves transfer of electrons.