Q. 203.6( 25 Votes )

Write the balanced chemical equation for the following reactions and identify the type of reaction in each case.

(a) In Thermite reaction, 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.

Answer :

(a)


This is an example of displacement reaction. Displacement reaction is one in which more reactive component of a reactant displaces the comparatively lesser reactive component.


(b)


When magnesium is burned in air , then the magnesium reacts with nitrogen in the air and some magnesium nitride is also formed.


(c)


This is an example of displacement reaction. Displacement reaction is one in which more reactive component of a reactant displaces the comparatively lesser reactive component.


(d)


This is an example of combustion reaction. In such a reaction the reactant burns in oxygen to produce carbon dioxide and water. It is also an exothermic reaction as it evolves a lot of heat. It is also known as oxidation reaction.


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