(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.
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Solution

Each option: 1.25 Marks

(a) Vanadium pentoxide or platinum
(b) (i) $S O_{3} + H_{2} S O_{4} \to H_{2} S_{2} O_{7} O l e u m$
(ii) $H_{2} S_{2} O_{7} + H_{2} O \to 2 H_{2} S O_{4}$
(c) Dilute sulphuric acid
$N a_{2} S O_{3} + H_{2} S O_{4} (d i l .) \to N a_{2} S O_{4} + H_{2} O + S O_{2} ↑$
(d) $2 N a O H (a q) + S O_{2} (g) \to N a_{2} S O_{3} S o d i u m s u l p h i t e (a q) + H_{2} O (l)$

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(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?
(iv) Write the equation for the reaction by which sulphur dioxide is converted to sodium sulphite in step F?

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

{S O}_{x} + H_{2} {S O}_{4} \to H_{2} S_{2} O_{y} H_{2} S_{2} O_{7} + H_{2} O \to 2 H_{2} {S O}_{4}

Find the value of x and y :

Q. 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]

Making use only of substances chosen from those given below:

Dilute sulphuric acid
Zinc
Lead

sodium carbonate
sodium sulphite
calcium carbonate

Give the equations for the reactions by which you could obtain:
(i) hydrogen
(ii) sulphur dioxide
(iii) carbon dioxide
(iv) zinc carbonate (two steps required).

Which catalyst is used in the contact process to convert sulphur dioxide into sulphur trioxide?

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Each option: 1.25 Marks (a) Vanadium pentoxide or platinum (b) (i) SO3+H2SO4→H2S2O7Oleum (ii) H2S2O7+H2O→2H2SO4 (c) Dilute sulphuric acid Na2SO3+H2SO4(dil.)→Na2SO4+H2O+SO2↑ (d) 2NaOH (aq)+SO2(g)→Na2SO3Sodium sulphite (aq)+H2O (l)