Give two examples of combination reaction ?

Explanation

Examples of combination reaction :
The ammonia gas reacts with hydrogen chloride gas to form the salt in gaseous state , immediately it condenses at room temperaature and gets transformed into the solid state. `underset("Ammonia")(NH_(3_((g))))+underset("chloride")underset("Hydrogen")(HCl_((g)))rarrunderset(("a single product"))underset("Ammonium chloride")(NH_(4)Cl_((s)))`
(2) Magnesium burns in air to form white powder of magnesium oxide as a single product .
`underset("Magnesium")(2Mg)+O_(2)overset(heat)rarrunderset(("a single product"))underset("Ammonium chloride")(2MgO)`
Iron reacts with sulphur to from iron sulphide.
`underset("Iron")(Fe_((s)))+underset("sulphur")(S_((s)))overset("heat")rarrunderset("Iron sulphide")(FeS_((s)))`