gives higher yield of petrol.
lower octane number of petrol.
higher sulphur content in the product.
higher gum forming material in petrol.
✅ The correct answer is option A.
Engineering
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2442. H/C ratio (by weight) for the same number of carbon atoms is the highest in case of
aromatics
paraffins
olefins
naphthenes
✅ The correct answer is option D.
2443. Pick out the correct statement about catalytic polymerisation.
H2SO4 polymerisation process gives gasoline rich in unsaturates.
In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho H3PO4 formation, which are inactive.
both (a) and (b)
neither (a) nor (b)
✅ The correct answer is option B.
2444. Smoke point of a test sample of kerosene is found to be 15 mm. On removal of __________ from it, the smoke point rises to 25 mm.
n-paraffins
olefins
aromatics
none of these
✅ The correct answer is option C.
2445. The general formula of naphthenes is
CnH2n + 2
CnH2n-6 (where, n ≥ 6)
CnHn-4
same as that for olefins i.e. CnH2n
✅ The correct answer is option D.
2446. Smoke volatility index is equal to smoke point plus
0.42 x(% distilled at 204°C)
5 mm
0.84 x (% distilled at 204°C)
10 mm. approximately
✅ The correct answer is option A.
2447. The proper arrangement of the petroleum fractions in order of their boiling points is
lubricating oil > diesel > petrol > LPG
lubricating oil > petrol > diesel > LPG
petrol > lubricating oil > diesel > LPG
petrol > diesel > LPG > lubricating oil
✅ The correct answer is option A.
2448. Which of the following fractions of petroleum contains maximum sulphur ?
Diesel
Gasoline
Naphtha
Atmospheric residue
✅ The correct answer is option D.
2449. Main constituent of natural gas is
CH4
C2H2
C2H4
C2H6
✅ The correct answer is option A.
2450. Flash point of an oil is determined by the
Pensky Martens apparatus.
Ramsbottom apparatus.
Saybolt viscometer.
Conradson apparatus.
✅ The correct answer is option A.