Chemistry
Answer
| Electrolytic reduction | Electrolytic refining |
|---|---|
| Metals higher in the activity series like potassium and sodium cannot be reduced by common reducing agents like CO or C, hence, these metals are obtained by electrolytic reduction of fused metallic salts. | It is the method by which crude metal is purified. |
| Cathode is usually made of iron and anode of graphite. | Impure metal is made the anode while pure metal is the cathode. |
| It precedes electrolytic refining. | It is done after electrolytic reduction. |
Related Questions
State the position of aluminium in the periodic table.
(a) Give the chemical names and formulae of the main ores of
(i) aluminium,
(ii) iron and
(iii) zinc.
(b) Which impurities are present in bauxite?
(c) What is red mud, how is it removed?
Give three ways in which the metal zinc differs from the non-metal carbon. At least one of the differences must be a chemical difference.
(a) Aluminium is a more active metal than iron but suffers less corrosion. Why?
(b) Explain and give reasons why aluminium vessels should not be cleaned with powders containing alkalis.