Chemical Process
Oxidation of SO₂ to SO₃ is favoured by

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

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Chemical Process
Pasteurisation of milk means

Inhibiting the growth of micro-organisms without killing them
Removal of fatty and albuminous substance from it
Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics
None of these

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