Q6 of 26 Page 70

Name the process by which sulphide ores are concentrated.

Roasting is the process by which sulphide ores are concentrated. The sulphides ores are changed into oxides by heating them strongly in the presence of excess air. This process is known as roasting. The reaction is given below:

2ZnS + 3O2 + heat → 2ZnO + 2SO2


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Give reason for the following:

(a) Sodium metal is kept immersed in kerosene.


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