Question

(i) Write the principle of vapour phase refining.

(ii) Write the role of dilute NaCN in the extraction of silver.

(iii) What is the role of collectors in the froth floatation process? Give an example of a collector.

Answer 1

(i) Metal is converted into volatile compound which on strong heating is decomposed to give pure metal.

(ii) It acts as a leaching agent/forms soluble complex with Ag.

(iii) Enhance non- wettability of mineral particles.for e.g.pine oil,Fatty acids,xanthates (any one).