Answer :

The types of dissociation reaction are:-


i. Electrolysis:


In this method electrical energy is used to decompose the reactant into products. To bring about the decomposition electrical energy or electric current is passed through the fused salt of the substance.


Example – Electrolysis of water gives hydrogen and oxygen as shown –


2H2O 2H2 + O2


ii. Thermal decomposition:


In this method heat energy is used to decompose the reactant into products.


Example – Decomposition of calcium carbonate as shown to give calcium oxide and oxygen s is a thermal decomposition reaction –


CaCO3 CaO + O2


iii. Photolysis:


In this method energy from the sun is used to decompose the reactant into products.


Example – Decomposition of hydrogen bromide as shown –


2HBr H2 + Br2


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