Petroleum Refinery Engineering
Dearomatisation of kerosene (by liquid sulphur dioxide extraction) is done to

Increase its smoke point
Decrease the breathing loss
Improve its oxidation stability
None of these

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Petroleum Refinery Engineering
Mercaptans are

Undesirable in petrol, as they reduce its octane number
Added in LPG cylinders to detect gas leakage by its smell
Low boiling sulphur compounds
All of these

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