What is meant by combination reaction ? Explain it with a suitable example.

Explanation

Chemical reaction in which two or more substances (reactants) undergo reaction to form a single product is called combination reaction.
For example
`underset("(Lime stone, quick lime)")(underset("Calcium oxide")(CaO(s)))+underset("water")(H_(2)O(I)) to underset("(Slaked lime, lime water)")(underset("Calcium hydroxide")(Ca(OH)_(2)(aq)))`
In above reaction, two compounds CaO(s) and `H_(2)O(l)` undergo chemical reaction and form single product `Ca(OH)_(2)(aq)`, along with evolution of heat. Thus, this reaction is a combination reaction.