Assertion :In froth floatation process, sodium ethyl xanthate is used as collector.
Reason :Sulphide ores are water soluble.

Froth floatation process used for the concentration of sulphide ore uses sodium ethly xanthate, $C_2{H}_{5}OC{S}_{2}Na$ as collector.
Other examples of collector include ethyl xanthate and potassium ethyl xanthate. They attach themselves to the grains of mineral by polar groups so that minerals become water repellent and pass on into the froth.