Question

10. State the kind of chemical reactions in the following examples
(a) Digestion of food in stomach
(b) Combustion of coal in air
(c) Heating of limestone
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Answer 1

Answer:

(a) Digestion of food in stomach --> Decomposition reaction.

(Explanation:Decomposition is nothing but a chemical reaction and breaking down of food into digestible nutrients such as Carbohydrates, proteins, fats which our body required for proper functioning.)

(b) Combustion of coal in air --> Redox reaction.

(Explanation:Burning coal is a chemical change called combustion. A combustion is the chemical reaction (redox reaction) of coal with oxygen O2.)

(c) Heating of limestone --> Decomposition reaction.

(Explanation: Decomposition reaction is the chemical change that takes place when limestone is heated strongly. As a result quick lime and Carbon dioxide is formed.)

Answer 2

Answer:

Digestion of food in stomach --> Decomposition reaction. (Explanation:Decomposition is nothing but a chemical reaction and breaking down of food into digestible nutrients such as Carbohydrates, proteins, fats which our body required for proper functioning.) (b) Combustion of coal in air --> Redox reaction