The role of depressants in Froth Floatation method* is to

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reduce the consumption of oil for froth formation.

stabilize the froth.

enhance non-wettability of the mineral particles.

selectively prevent one component of the ore from coming to the froth.

answer is A.

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Detailed Solution

In froth floatation process, depressant prevents the formation of froth. It is used to separate two sulphide ores by preventing the formation of froth of one sulphide ore and allowing the other to form the froth e.g. NaCN, a depressant selectively prevents Zns from coming in froth but allows PbS to come with the froth.

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