JEE Main 2022 · 26 Jun · Shift 2 · Chemistry Q64

ChemistrySingle correct+4 / -1Question 64 of 90

The role of depressants in 'Froth Floation method' is to

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

reduce the consumption of oil for froth formation.

stabilize the froth.

enhance non-wettability of the mineral particles.

Answer and worked solution

Official answer: A

Depressants (e.g. NaCN for ZnS in a PbS-ZnS ore) stop one mineral forming a froth, so the other floats selectively.

(A)

Topics:Concentration of ores

JEE Main 2022 · 26 Jun · Shift 2, Chemistry question 64