Question

2H2O → 2H2 + O2 is an example of ______________

(a) combination

(b) decomposition

(c) disproportionation

(d) double decomposition

I had been asked this question by my college professor while I was bunking the class.

The origin of the question is Redox Reactions and Electrode Processes topic in section Redox Reactions of Chemistry – Class 11

Answer 1

The correct answer is (b) decomposition

Explanation: The reverse reaction of a combination reaction as a decomposition reaction. In a decomposition reaction, the breakdown of a compound happens into two or more components, here water is broken down into hydrogen and oxygen, so it is a decomposition reaction.