Answer:
(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 ore particles are preferentially
wetted by oil, become lighter and rise to the surface along with the froth while
gangue particles are preferentially wetted by water, become 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.
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