Correct the following statement — Haematite is the chief ore of aluminium.

State the main constituent metal in each alloy :

(i) Duralumin

(ii) Brass

(iii) Stainless steel

The sketch illustrates refining of aluminium by Hoope's process. [reference]

(i) Which of A and B is the cathode and which one is the anode?

(ii) What is the electrolyte in the tank?

(iii) What material is used for the cathode?

Select the correct property which is not true for metals:

1. Metals are good conductors of electricity
2. Metals are malleable and ductile
3. Non-polar covalent compounds are formed from metals
4. Metals have 1, 2 or 3 valence electrons.