Write the difference between rancidity and calcination.

1. It is a condition in which the substance with oil and fats get oxidized when they are exposed to air.

1. It is the conversion of metals into their oxides at high temperature in a limited supply of air.

2. A substance is said to be rancid when there is a change in smell, taste, and colour.

2. Carbonates, bicarbonate ores are subjected to calcination process.

3. An example of rancidity is when a chips pack is exposed to atmospheric air which results in a change in taste and odour.

3. Ex: ZnCO₃ → ZnO + CO₂.