The chemical name of the main ore of aluminium.

1. Aluminium fluoride
2. Aluminium oxide
3. Sodium aluminium fluoride
4. Hydrated aluminium oxide

The process of dressing of the ore which involves separation of ore & gangue due to preferential wetting.

1. Magnetic separation
2. Hydrolytic method
3. Froth flotation method
4. Chemical method

Name the substance A to E, reacted with each reactant below to give the respective product/s.

1. $\text{Conc. iron pyrites} \xrightarrow{\text{A}} \text{Iron III oxide} + \text{Sulphur dioxide}$

2. $\text{Zinc oxide} \xrightarrow{\text{B}} \text{Zinc} + \text{Carbon monooxide}$

3. $\text{Copper [II] oxide} \xrightarrow{\text{C}} \text{Copper} + \text{Water}$

4. $\text{Impure bauxite} \xrightarrow{\text{D}} \text{Sodium aluminate}$

5. $\text{Sodium aluminate} \xrightarrow{\text{E}} \text{Aluminium hydroxide}$

Name the following :

(i) A metallic ore converted to it's oxide – iron [II] oxide on heating the concentrated ore.

(ii) A black metallic oxide reduced to metal on heating with coke.

(iii) The compound which on ignition at elevated temperatures gives pure alumina.

(iv) The non-metal which forms the anode during electrolytic reduction of fused alumina in Hall Heroult's process.

(v) A metal other than manganese, present in duralumin but not in magnalium.