Distinguish between the following pairs of compounds using the test given within brackets: Dilute sulphuric acid and dilute hydrochloric acid [using barium chloride solution]

State – Any two conditions for the conversion of sulphur dioxide to sulphur trioxide.

Identify the acid in each case:

(i) The acid which is used in the preparation of a non­-volatile acid.

(ii) The acid which produces sugar charcoal from sugar.

(iii) The acid on mixing with lead nitrate soln. produces a white ppt. which is insoluble even on heating.

Give equations for the action of sulphuric acid on —

(a) Potassium hydrogen carbonate.

(b) Sulphur