Q. When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place:
a. in the first case? b. in the second case?
The solution is as follows:
Answer 1:
1. When hydrogen burns in oxygen to give water, it is an example of combination reaction. The reaction is as follows:
2 H2(aq) + O2(g) 2 H2O (g)
2. When water is electrolysed to give hydrogen and oxygen, it is an example of decomposition reaction. The reaction is as follows:
2 H2O(l) 2 H2(g) + O2(g)
Answer 1:
1. When hydrogen burns in oxygen to give water, it is an example of combination reaction. The reaction is as follows:
2 H2(aq) + O2(g) 2 H2O (g)
2. When water is electrolysed to give hydrogen and oxygen, it is an example of decomposition reaction. The reaction is as follows:
2 H2O(l) 2 H2(g) + O2(g)