The following flow diagram shows the main steps for the manufacture of sulphuric acid by the Contact Process.

(a) Name a substance other than sulphur that would react with dry air on heating to form sulphur dioxide.
(b) Write the equation for the reaction taking place in the catalytic converter.
(c) The sulphur trioxide is absorbed in $98 %$ sulphuric acid and not in water. Give a reason for this and write the equation taking place here.
(d) What is added to change oleum into sulphuric acid?
[5 MARKS]

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Solution

Each option: 1.25 Marks

(a) Iron pyrites $(F e S_{2})$ gives sulphur dioxide on burning.
(b) In the converter, sulphur dioxide is oxidised to sulphur trioxide.
$2 S O_{2} + O V_{2} O_{5} - -- \to H e a t 2 S O_{3} + H e a t$

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Q. (a) Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.
(b) In the Contact process for the manufacture of the sulphuric acid, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead, a two-steps procedure is used. Write the equations for the two steps involved in D.
(c) What type of substance will liberate sulphur dioxide from sodium sulphite to step E?
(d) Write the equation for the reaction by which sulphur dioxide is converted to sodium sulphite in step F.
[5 MARKS]

(i) Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.
(ii) In the contact process for the manufacture of sulphuric acid, 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 step involved in D.
(iii) What type of substance will liberate sulphur dioxide from sodium sulphite in step E?
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Each option: 1.25 Marks (a) Iron pyrites (FeS2) gives sulphur dioxide on burning. (b) In the converter, sulphur dioxide is oxidised to sulphur trioxide. 2SO2+OV2O5−−−→Heat2SO3+Heat

Each option: 1.25 Marks

(a) Iron pyrites $(F e S_{2})$ gives sulphur dioxide on burning.
(b) In the converter, sulphur dioxide is oxidised to sulphur trioxide.
$2 S O_{2} + O V_{2} O_{5} - -- \to H e a t 2 S O_{3} + H e a t$