The process of oxidation of fats and oils which can be noticed by a change in colour, smell, and taste is known as rancidity. Rancidity, condition produced by aerial oxidation of unsaturated fat present in foods and other products, marked by unpleasant odour or flavour. The process of oxidation of fats and oils which can be noticed by a change in colour, smell, and taste.

Balance the following chemical reaction. (i) Mg + N 2 → Mg 3 N 2

The balanced chemical reaction is as follows: 3 Mg + N 2 → Mg 3 N 2 In this reaction, oxidation of Mg and reduction of nitrogen is taken place. This represents a redox reaction. Magnesium is oxidized, and dinitrogen is reduced.

Balance the following equation: CuS + HCl → CuCl 2 + H 2 S

The balanced chemical equation is as follows: CuS s + 2 HCl aq → CuCl 2 aq + H 2 S g When copper sulphide reacts with hydrochloric acid, copper chloride will form and hydrogen sulphide gas will be evolved.

Balance the following equation: Fe + H 2 O → Fe 3 O 4 + H 2

The balanced equation is as follows: 3 Fe + 4 H 2 O → Fe 3 O 4 + 4 H 2 When iron reacts with oxygen and water, iron oxide is formed. This iron oxide is commonly known as rust and the process is known as rusting.

What happens chemically, when quicklime is added to water? Give the chemical reaction.

When quicklime is added to water, it forms slaked lime along with the evolution of heat. There will be a rise in the temperature of the bucket. Calcium oxide reacts with water to form calcium hydroxide, also called slaked lime. The chemical equation is as follows: CaO + H 2 O → Ca OH 2

Ferrous sulphate decomposes with the evolution of gas having characteristics odour of burning sulphur. Identify the type of reaction.

Ferrous sulphate decomposes with the evolution of gas having characteristics odour of burning sulphur the type of this reaction is the thermal decomposition reaction. 2 FeSO 4 → ∆ Fe 2 O 3 + SO 2 + SO 3 On heating, anhydrous ferrous sulphate decomposes to form ferric oxide.