Oxidation of sulphur dioxide into sulphur trioxide in the absence of a catalyst is a slow process but this oxidation occurs easily in the atmosphere. Explain how does this happen? Give chemical reactions for the conversion of `SO_(2)` into `SO_(3)`.

Which of the following chemical reactions depicts the oxidizing behaviour of H_(2)SO_(4) ?

Sulphuric acid is manufactured by Contact process : Give the conditions for the oxidation of SO_2 .

Which oxide of nitrogen is used as a catalyst in lead chamber process for the manufacture of H_2SO_4 ?

Some bacteria obtain their energy by oxidising sulphur, producing sulphuric acid as a by-product. In the laboratory, or in industry, the first step in the conversion of sulphur to sulphuric acid is to produce sulphur dioxide. The sulphur dioxide is converted to sulphur trioxide, which reacts with water to give sulphuric acid. Write the equation for the conversion of sulphur dioxide to sulphur trioxide. Why does this reaction supply energy?

(i) The flow chart below shows steps in the Contact process or the manufacture of sulphuric acid : (ii) Write equations for : (1) The roasting of iron pyrites. (2) Formation of sulphur trioxide from sulphur dioxide.(III) (3) Platinum was the catalyst used in the conversion of sulphur dioxide to sulphur trioxide. What is the common name of the catalyst used nowadays ? (4) Give the formula of oleum. (5) Name the substance which is added to change oleum into sulphuric acid.

(i) Give balanced chemical equations for the action of sulphuric acid on each of the following: (1) Potassium hydrogen carbonate. (2) Sulphur.' (ii) In the contact process for the manufacture of sulphuric acid give the equations for the conversion of sulphur trioxide to sulphuric acid.

Why in the manufacture of H_2 SO_4 by contact process, sulphur trioxide is not directly dissolved in water ?

The oxidation of SO_(2) to SO_(3) is an exothermic reaction. The yield of SO_(3) will be maximum if :

Some bacteria obtain their energy by oxidising sulphur, producing sulphuric acid as a by-product. In the laboratory, or in industry, the first step in the conversion of sulphur to sulphuric acid is to produce sulphur dioxide. The sulphur dioxide is converted to sulphur trioxide, which reacts with water to give sulphuric acid. Name one catalyst used industrially which speeds up the conversion of sulphur dioxide to sulphur trioxide.

Write balanced chemical equations to show how SO_3 is converted to Sulphuric acid in the contact process.