Question

(a) Write the principle of vapour phase refining.
(b) Write the role of dilute NaCN in the extraction of silver.
(c) What is the role of collectors in the froth floatation process? Give an example of a collector.

Answer 1

(a) In this method, crude oil is converted into a volatile substance which decomposes into a pure metal on heating at higher temperature.
(b) It acts as a depressant.
(c) Collectors enhance non-wettability of mineral particles.
For example, Pine oil.