Name the main component of the alloy -

(i) Brass

(ii) Duralumin

Name the most common ore of the metal aluminium from which the metal is extracted. Write the chemical formula of the ore.

Write a balanced chemical equation for -

(i) The formation of aluminium at the cathode, during the electrolysis of alumina

(ii) Action of heat on aluminium hydroxide.

Choose the correct answer from the options A, B, C and D given. The reason for using aluminium in the alloy duralumin is:

A: Aluminium is brittle
B: Aluminium gives strength
C: Aluminium brings lightness
D: Aluminium lowers melting point