A metal X present in rock salt is highly reactive and it is stored under kerosene to prevent it from catching fire. It exists in nature as XCI. Identify the metal 'X'. How can this metal be extracted from its Chloride ore, Write chemical equations to explain your answer? How is calcination different from roasting?

Explanation

(a)This metal is Sodium. This metal is extracted from sodium chloride by electrolytic reduction of molten sodium chloride. The metal gets deposited at negatively charged electrode or cathode whereas chlorine is liberated at positively charged electrode or anode The reactions involved are,
At cathode: `Na^(+) + e^(-) to Na`
At anode : `2Cl^(-) + e^(-) to Cl_2`
(b)Calcination : Heating ore in the absence of air .
`(ZnCO_3 to ZnO+ CO_2)`
Roasting : Heating ore in the presence of air.
`(2ZnS + 3O_2 = 2ZnO + 2SO_2)`