Q. 14

State the kind of chemical reactions in the following examples: (2014)

(i) Digestion of food in stomach

(ii) Combustion of coal in air

(iii) Heating of limestone

Answer :

(i) Digestion of food in stomach: During digestion, the complex food is broken into simpler form.

Therefore, it is a type of decomposition reaction.


(ii) Combustion of coal is air: During combustion the coal burns in air to form CO2, H2O along with the evolution of heat. Thus, it is a type of exothermic decomposition reaction.


(ii) Heating of limestone: When limestone is heated strongly, it breaks into CO2 and lime. Thus it is a type of thermal decomposition reaction.


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