question_answer

State the kind of chemical reactions in the following examples:

(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 in air: During combustion the coal burns in air to form  \[C{{O}_{2}},\text{ }{{H}_{2}}O\] along with the evolution of heat. Thus, it is a type of exothermic decomposition reaction.

(iii) Heating of limestone: When limestone is heated strongly, it breaks into \[C{{O}_{2}}\] and lime. Thus it is a type of thermal decomposition reaction.