\tRancidityCalcination1. 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.\t