Assertion : Sulphide ores are concentrated by Froth Floatation method.
Reason : Cresols stabilise the froth in Froth Floatation method

Options

A. Both assertion and reason are true and reason is the correct explanation of assertion.
B. Both assertion and reason are true but reason is not the correct explanation of assertion.
C. Assertion is true but reason is false
D. Assertion is false but reason is true.

Answer

B

Explanation

(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
Sulphide ores are concentrated by froth floatation method. Sulphide are particels are preferentially wetted by oil, become lighter and rise to the surface along with the froth while gangue particle are preferentially wetted by water, becomes heavier and thus settle down at the bottom of the tank and cresols stabilise the froth in froth floatation method.
Formation of froth is main reason for extraction of metal. Metal ore comes out along with froth.