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Froth floatation process used for the co...

Froth floatation process used for the concentration of sulphide ore. Which of the following statements are correct
(a) It is based on the difference in wettablity of different minerals
(b) Sodium ethyl xanthat, `C_(2)H_(2)OCS_(2)` Na is used as collector
(c ) NaCN is used as depressant of ZnS and PbS

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Assertion : Froth flatation process is used to concentrate sulphide ores. Reason : There is a difference in the nature of wettibility of different ores.

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