Petroleum Refinery Engineering
Concentration of H₂SO₄ catalyst in alkyla-tion is kept between 90-98%, because H₂SO₄ having concentration

Neither A nor B
Less than 90% promotes polymerisation
More than 98% promotes cracking
Both A & B

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Petroleum Refinery Engineering
Mercaptans are

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

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