First slide

General methods of extraction of elements from the earth crust

Question

Select the correct statement.

Moderate

A

Alkali metals can be obtained by chemical reduction of their compounds.
B

Sylvine is an ore of potassium.
C

Oxide ores are purified by levigation process.
D

During electrorefining of a metal, impure metal is made anode.

Solution

Correct (1) As alkali metals are strongest reducing agents, they cannot be obtained by chemical reduction of their compounds.

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