State the kind of chemical reactions in the following examples:
$(a)$ Digestion of food in the stomach
$(b)$ Combustion of coal in air.
$(a)$ Digestion of food in the stomach
$(b)$ Combustion of coal in air.
(N/A) Digestion of food involves the breakdown of complex food molecules into simpler substances,which is a decomposition reaction.
$(b)$ Combustion of coal involves the reaction of carbon with oxygen to form carbon dioxide,which is a combination reaction.
$(b)$ Combustion of coal involves the reaction of carbon with oxygen to form carbon dioxide,which is a combination reaction.
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