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Q.

Froth flotation process used for the concentration of sulphide ore

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a

Is based on the difference in wettability of different minerals

b

Uses sodium ethyl xanthate, C2H5OCS2Na, as collector

c

Uses NaCN as depressant in the mixture of ZnS and PbSwhen ZnS forms soluble complex and PbS forms froth

d

Uses pine oil as frothing agent

answer is A.

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