First slide

General methods of extraction of elements from the earth crust

Question

Select the correct statement.

Moderate

A

Alkali metals are generally extracted by electrolysis of their ores in fused state.
B

Levigation is generally employed for concentration of sulphide ores.
C

Every mineral is an ore, but every ore is not a mineral.
D

Slag is a product formed during smelting by combination of flux and impurities.

Solution

Correct for option (2) is Froth flotation process is employed for concentration of sulphide ores.Levigation is the process of decreasing the particle size.

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