Chapter 20, Problem 5STP

Interpretation Introduction

Interpretation: The reaction that is not a redox reaction is to be chosen from the given options.

Concept Introduction:

A chemical reaction in which both oxidation and reduction take place simultaneously is called redox reaction.

Answer to Problem 5STP

Correct answer: The correct option is ‘B’.

Explanation of Solution

Reason for correct option: In double displacement reaction only, ions are exchanged between two reactants. Here, the oxidation and reduction processes are not observed. Hence, a double displacement reaction is not a redox reaction.

Conclusion

Reasons for incorrect options:

Option A is incorrect: In a single displacement reaction, one element is substituted with another element to form a compound during this transfer the elements gain and lose electrons simultaneously.

Option C is incorrect: Combustion which is known as burning, this reaction involves oxygen to burn a substance and the products of the combustion reaction are called oxides. In this process, both oxidation and reduction occur.

Option D is incorrect: Combination reactions are also considered to be redox reactions because, in this reaction, two elements are combined to make a single product while combining there is the transfer of electrons, that is, one element can be reduced and another will be oxidized.