JEE Main levelSingle correct optionDifficulty 2 of 3mt015
Assertion (A): In froth flotation the ore particles are carried up in the froth while the gangue settles.
Reason (R): The gangue particles are preferentially wetted by the oil while the ore particles are wetted by water.
ABoth A and R are true and R is the correct explanation of A
BBoth A and R are true but R is not the correct explanation of A
CA is true but R is false
DA is false but R is true
Answer: C
A is true: the collector makes the sulphide particles water-repellent so they stick to air bubbles and rise. R is false because it states the reverse: the ore is wetted by oil and the gangue is wetted by water and sinks.