Metal sulphides occur mainly in rocks an...

Metal sulphides occur mainly in rocks and metal halides occur in lakes and seas. Give reason.
(b) Pine oil is used in froth flatation process. Why ?
( c) What is a depresent ? Give an example.
(d) What is the role of stabiliser in froth flotation process ?
( e) What is gangue ?

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Metal sulphides occur mainly in rocks and metal halides in lakes and seas. Explain.

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