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.

State the kind of chemical reactions in the following examples: Digestion of food in stomach

State the kind of chemical reactions in the following examples: Heating of lime stone.

State the kind of chemical reactions in the following examples: Combustion of coal in air

Identify the type of chemical reaction in the following statements and define each of them: (i) Digestion of food in our body (ii) Rusting of iron (iii) Heating of manganese dioxide with aluminium powder (iv) Blue colour of copper sulphate solution disappears when iron filings are added to it

Write balanced chemical equations for the following reactions : (i) When copper is heated in air. (ii) When aluminium is heated in air. (iii) Aluminium oxide reacts with Sodium hydroxide.