Question

When is the ore subjected to leach?

(a) When the ore is in immiscible liquid

(b) When the impurity is in immiscible liquid

(c) When both ore and impurity are insoluble in water

(d) When only impurity is soluble in water

This question was addressed to me in unit test.

Question is taken from Extraction of Crude Metal from Concentrated Ore in section General Principles and Processes of Isolation of Elements of Chemistry – Class 12

Answer 1

The correct option is (c) When both ore and impurity are insoluble in water

Explanation: The ore is subjected to leaching when both the ore and impurity are insoluble in water. Leaching process is commonly referred to as extraction. This is a process in which water soluble substances are washed out from soil or wastes.