2567. The doctor’s solution comprises of sodium plumbite in
alcohal
water
aqueous caustic soda
soda ash
✅ The correct answer is option C.
2497. Crude oil is subjected to vacuum distillation in the last stage, because
high boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose.
lighter/low boiling products are prone to thermal decomposition.
high purity products can be obtained thereby.
none of these.
✅ The correct answer is option A.
2502. Polymerisation
produces i-octane from cracked gases containing i-butane and butene.
causes olefins to combine with each other.
causes aromatics to combine with each other.
is aimed at producing lubricating oil.
✅ The correct answer is option B.
2507. Visbreaking
uses natural gas as feed.
is carried out at atmospheric pressure.
produces fuel oil of lower viscosity.
produces gasoline only.
✅ The correct answer is option C.
2512. Diesel index.(an alternative index for expressing the quality of diesel) is
determined by using a test engine.
not related to aniline point.
equal to cetane number plus 3.
all (a), (b) & (c).
✅ The correct answer is option C.
2517. Which of the following is not an important property of fuel oil/furnace oil ?
Sulphur content
Viscosity
Aniline point
Flash point
✅ The correct answer is option C.
2522. Sweetening of petroleum product means the removal of
sulphur & its compounds
water
organic impurities
wax
✅ The correct answer is option A.
2527. Dearomatisation of kerosene (by liquid sulphur dioxide extraction) is done to
increase its smoke point.
improve its oxidation stability.
decrease the breathing loss.
none of these.
✅ The correct answer is option B.
2531. Solvent used for dewaxing of petroleum products are
furfural
methyl ethyl ketone (MEK)
propane
both(b)&(c)
✅ The correct answer is option D.
2534. The most widely used crude topping column in refineries is the __________ column.
bubble-cap
packed bed
fluidised bed
perforated plate
✅ The correct answer is option A.