Chemical Process
Oxidation of SO₂ to SO₃ is favoured by

Low temperature and low pressure
High temperature and low pressure
Low temperature and high pressure
High temperature and high pressure

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Chemical Process
During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as

Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)
It decomposes on further increasing the temperature
It is very corrosive at elevated temperature
None of these

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