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JEE Main · 2022 · 26 Jun 2022 · Shift 2 · General Principles and Processes of Isolation of Metals

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The role of depressants in Froth Flotation method is to
  1. (A)selectively prevent one component of the ore from coming to the froth.✓ Correct
  2. (B)reduce the consumption of oil for froth formation.
  3. (C)stabilize the froth.
  4. (D)enhance non-wettability of the mineral particles.

Answer: (A)

Solution

In the froth flotation method, depressants are chemicals that selectively prevent certain components (usually impurities) from coming to the froth, allowing the desired mineral to be separated.

For example, in galena ore (PbS with ZnS impurity), sodium cyanide (NaCN) acts as a depressant to prevent ZnS from floating, allowing PbS to be collected in the froth.

Therefore, the correct answer is that depressants selectively prevent one component of the ore from coming to the froth.

JEE Main · 2022 · 26 Jun 2022 · Shift 2 · Single correct option

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