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Question
Sulphuric acid is manufactured by the contact process.
Give the conditions for the oxidation of \[\ce{SO2}\]
Solution
- The optimum temperature should be as low as possible. The yield has been found to be maximum at about 410°C-450°C.
- High pressure (2 atm) is favoured because the product formed has less volume than the reactant.
- Excess oxygen increases the production of sulphur trioxide.
- Vanadium pentoxide, or platinised asbestos, is used as a catalyst.
- Concentration of Reactants.
- A pure and dry mixture of two parts of \[\ce{SO2}\] and one part of \[\ce{O2}\] by vol. is used.
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