Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide.

In the Contact process, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead a two- step procedure is used. Write the equations for the two steps involved.

Choose the property of sulphuric acid (A, B, C or D), which is relevant to each of the preparations (i) to (iii) :

A: Dil. acid (typical acid properties)

B: Non-volatile acid

C: Oxidizing agent

D: Dehydrating agent

Preparation of :

(i) HCl

(ii) ethene from ethanol

(iii) copper sulphate from copper oxide.

Name the process used for the large scale manufacture of sulphuric acid.