Give equations for the purification of bauxite. Name the process involved.

Within a Group, where would you expect to find the element with :

(i) the greatest metallic character ?

(ii) the largest atomic size ?

(i) Which concentrated acid will oxidize sulphur directly to sulphuric acid ? Write the equation for the same.

(ii) Complete the following : concentrated sulphuric acid is used in the laboratory preparation of nitric acid and hydrochloric acid because it is — (less volatile/stronger) in comparison to these two acids.

(iii) Write the observation and the balanced equation, when a paper dipped in acidified potassium dichromate solution is put on the mouth of a test tube containing sulphur dioxide gas.

Give equations for the following :

(i) Preparation of acetylene

(ii) Preparation of ethyl alcohol

(iii) Addition of chlorine to ethylene

(iv) Preparation of ethane

(v) Sulphurous acid reacts with bromine.