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Question
Sulphuric acid is manufactured by the contact process.
Give the conditions for the oxidation of SO2.
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Solution
- The optimum temperature should be as low as possible. The yield has been found to be maximum at about 410°C-450°C.
- We favour high pressure (2 atm) because the formed product 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 SO2 and one part of O2 by vol. is used.
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