Aluminium carbide reacts with water according to the following equation :

Al₄C₃ + 12H₂O ⟶ 4Al(OH)₃ + 3CH₄

(i) State what mass of aluminium hydroxide is formed from 12 g. of aluminium carbide.

(ii) State the volume of methane at s.t.p. obtained from 12 g of aluminium carbide.

[relative molecular weight of Al₄Cl₃] = 144 ; Al(OH)₃ = 78

(i) If 150 cc of gas A contains X molecules, how many molecules of gas B will be present in 75 cc of B?

The gases A and B are under the same conditions of temperature and pressure.

(ii) Name the law on which the above problem is based.

Complete the following table which relates to the homologous series of hydrocarbons.

(i) Name the most common ore of the metal aluminum from which the metal is extracted. Write the chemical formula of the ore.

(ii) Name the process by which impure ore of aluminum gets purified by using concentrated solution of an alkali.

(iii) Write the equation for the formation of aluminum at the cathode during the electrolysis of alumina.