Write the balanced chemical equations for the following reactions and identify the type of reaction in each case.
(a) Iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.
(b) Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride.
(c) Chlorine gas is passed in an aqueous potassium iodide solution to form potassium chloride solution and solid iodine.
(d) Ethanol is burnt in air to form carbon dioxide, water and releases heat.

Explanation

(a) Thermite reaction `underset("Iron(III)oxide")(Fe_(2)O_(3)(s))+underset("Aluminium")(2Al(s))overset(triangle)tounderset("Molten iron")(2Fe(l))+underset("Aluminium oxide")(Al_(2)O_(3))`
This is an example of displacement reaction.
`(b) underset("Magnesium")(3Mg(s))+underset("Nitrogen")(N_(2)(g))overset(triangle)tounderset("Magnesium nitride")(Mg_(3)N_(2)(s))`
This is an example of combination reaction.
`(c) underset("Potassium iodide")(2KI(aq))+underset("Chlorine")(Cl_(2)(g))tounderset("chloride")underset("Potassium ")(2KCl(aq))+underset("Iodine")(I_(2)(s))`
This is an example of displacement reaction.
`(d)" " underset("Ethanol")(C_(2)H_(5)OH(l))+3O_(2)(g)tounderset("dioxide")underset("Carbon")(2CO_(2)(g))+3H_(2)O+"Heat"`
This is an example of combustion reaction.