Sulphuric acid is manufactured by a contact process.
(b) Give the conditions for the oxidation of $S O_{2}$

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Solution

Conditions for the oxidation of $S O_{2}$ :

A suitable catalyst: is required for oxidation like vanadium pentoxide $V_{2} O_{5}$ or platinum(Pt).

Exothermic reactions are favoured at low temperature: thus, temperature should be as low as possible and maximum yield is found to be at 410- $450^{0}$ C.

High pressure: is required because it favours the reaction because the product formed has less volume than the reactant.

Excess oxygen: is required as this increases production of sulphur trioxide $S O_{3}$ .

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Similar questions

Q. Sulphuric acid is manufactured by the Contact process.
(a) Give two balanced equations to obtain

S O_{2}

in this process.
(b) Give the conditions for the oxidation of

S O_{2}

.
(c) Why is

H_{2} S O_{4}

not obtained by directly reacting

S O_{3}

with water?
(d) Name the chemical used to dissolve

S O_{3}

and name also the product formed.
(e) Give all the main reactions to this process.
[5 MARKS]

Sulphur trioxide gas is an important precursor to manufacture sulphuric acid. It is produced by the catalytic oxidation of $S O_{2}$ gas. In the contact process, once we obtain $S O_{3} (g)$ , Sulphuric acid is obtained by the hydrolysis of $S O_{3} (g)$ .