A combination reaction is said to be the reaction between two or more molecules to form a larger molecule; whereas the decomposition reaction is defined as the splitting of larger molecules into two or smaller molecules. This essentially explains that the decomposition reaction is the opposite of the combination reaction.
In most cases, the decomposition reaction is endothermic since the heat from the surrounding or induced heat is used to break the bonds of the larger molecule. Few examples of decomposition reactions are:
ZnCO3 → ZnO + CO2
CaCO3 + Energy → CaO + CO2
2HgO → 2Hg + O2
Answered by Vishal kumar | 2 years agoProvide Some Important MCQ Questions for Class 10 Science Chemical Reactions and Equations with Answers?
Explain the following terms with one example each.
(a) Corrosion
(b) Rancidity Solution:
Oil and Fat containing food items are flushed with Nitrogen. Why?
Why do we apply paint on iron articles?
A shiny brown coloured element ‘X’ on heating in the air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.