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?

State the property of the metal utilized in Aluminium in Thermite welding.

The following is a sketch of an electrolytic cell used in the extraction of aluminium :

(i) What is the substance of which the electrodes A and B are made?

(ii) At which electrode (A or B) is the aluminium formed ?

(iii) What are the two aluminium compounds in the electrolyte C ?

(iv) Why is it necessary for electrode B to be continuously replaced ?

The metal oxide which can react with acid as well as alkali is :

1. Silver oxide
2. Copper [II] oxide
3. Aluminium oxide
4. Calcium oxide