(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?

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Solution

(i) Platinum or vanadium pentaoxide is commonly used as the catalyst in the conversion of sulphur dioxide to sulphur trioxide.

(ii) In the contact process for the manufacture of sulphuric acid, the sulphur trioxide first forms oleum, which on dilution gives sulphuric acid.

SO₃+ H₂SO₄ → H₂S₂O₇

H₂S₂O₇+ H₂O → 2H₂SO₄

(iii) Dilute sulphuric acid will liberate sulphur dioxide from sodium sulphite (Na₂SO₃ ) in step E.

Na₂SO₃ + H₂SO₄ → Na₂SO₄ + H₂O + SO₂

(iv) When sulphur dioxide is treated with aqueous sodium hydroxide, sodium sulphite is formed.

2NaOH + SO₂ → Na₂SO₃ + H₂O

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(c) What type of substance will liberate sulphur dioxide from sodium sulphite to step E?
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98 %

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

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).

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