Explain purification or refining of crude metal.

Refining is

Explain Zone refining.

Write in brief about the refining of metals.

During purification of crude metal the molten metal is stirred with logs of green wood in

Explain the purification of sulphide ore by Froth Floatation Method.

How the green wood poles are effecting in the refining of impure metal.

How the green wood poles are effecting in the refining of impure metal.

State the methods used for the purification of crude metals. Explain in which context these methods are used.

Explain the purification of colloids by dialysis and ultrafiltration.