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Question Question 1(2020)
State one relevant observation for the reaction : Sulphide ore is added to a tank containing oil and water and then stirred or agitated with air.
The ore is wetted by the oil and gets separated from the gangue in the form of froth. The impurities gets wetted by water and remain behind in the sink.
Since the ore is lighter, it comes on the surface with the froth and impurities are left behind.