Question

Differentiate between Combination reaction and decomposition reaction.

Answer 1

Difference between Combination reaction and decomposition reaction are-

Combination reaction	Decomposition reaction
When two or more substances combine with each other to form a single product is called combination reaction.	In a decomposition reaction, complex compound is broken down into two or more simpler compounds.
They are also known as synthesis reaction.	A source of energy, such as heat, light, or electricity, is required for most of the decomposition reactions.
For example, $\underset{\underset{(\mathrm{Quick}\mathrm{lime})}{\mathrm{Calcium}\mathrm{oxide}}}{\mathrm{CaO}\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\underset{(\mathrm{slaked}\mathrm{lime})}{\mathrm{Calcium}\mathrm{hydroxide}}}{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{aq}\right)}+\mathrm{Heat}$	For example,$\underset{\mathrm{Ferrous}\mathrm{Sulphate}}{2{\mathrm{FeSO}}_4\left(\mathrm{s}\right)}\stackrel{\mathrm{Heat}}{\to }\underset{\mathrm{Ferric}\mathrm{oxide}}{{\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)}+\underset{\mathrm{Sulphur}\mathrm{dioxide}}{{\mathrm{SO}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Sulphur}\mathrm{trioxide}}{{\mathrm{SO}}_3\left(\mathrm{g}\right)}$