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Question
State one relevant observation for the following reaction:
Sulphide ore is added to a tank containing oil and water, and then stirred or agitated with air.
Short Answer
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Solution
The oil wets the ore and separates it from the gangue as froth. Water wets the impurities, which remain in the sink. Since the ore is lighter, it rises to the surface with the froth, leaving the impurities behind.
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Chapter 7: Metallurgy - Questions from ICSE Examinations [Page 182]
