Arrange the following as per the instruction given in the brackets:

(a) Na, K, Cl, Si, S      (increasing order of ionisation potential)

(b) Be, Li, F, C, B, N, O      (increasing order of non-metallic character)

Identify the Anion present in each of the following compounds :

(a) When Silver nitrate solution is added to a solution of compound B, a white precipitate soluble in ammonium hydroxide solution is formed.

(b) When dilute Sulphuric acid is added to compound D, a gas is produced which turns lime water milky and also turns acidified potassium dichromate solution green.

Give balanced chemical equations for the following:

(a) Laboratory Preparation of Ethylene.

(b) Preparation of Ethanol by hydrolysis of alkyl halide.

(c) Ethene reacting with bromine.

What is the role played by the following substances in the extraction of Aluminium ?

(a) Caustic soda

(b) Fluorspar