2819. Mercaptans are
low boiling sulphur compounds.
added in LPG cylinders to detect gas leakage by its smell.
undesirable in petrol, as they reduce its octane number.
all (a), (b) and (c)
✅ The correct answer is option D.
2824. Octane number (unleaded) of gasoline produced by isomerisation of butane may be about
45
55
70
90
✅ The correct answer is option C.
2828. Pyrolysis of kerosene or natural gasoline is done to produce mainly the
olefins and aromatics
lighter paraffins
stabilised gasoline
diesel
✅ The correct answer is option A.
2833. Cetane number of alpha methyl naphthalene is assumed to be
0
100
50
∞
✅ The correct answer is option A.
2798. Crude topping column operates at __________ pressure.
atmospheric
10 atm
vacuum
3 atm.
✅ The correct answer is option A.
2803. Which of the following is the most important property for a jet fuel ?
Cloud point
Pour point
Colour
Freezing point
✅ The correct answer is option D.
2808. Liquefied Petroleum Gas (LPG) is mainly a mixture of
propane & butane
methane & ethane
high boiling olefins
high boiling naphthenes
✅ The correct answer is option A.
2812. Which of the following is desirable in diesel and kerosene but is undersirable in gasoline ?
Aromatics
Mercaptans
Paraffins
Naphthenic acid
✅ The correct answer is option C.
2817. Pressure & temperature maintained in catalytic cracking is about
2atm & 500°C
10atm & 500°C
30atm & 200°C
50atm. & 750°C
✅ The correct answer is option A.
2823. Reforming converts
olefins into paraffins
naphthenes into aromatics
naphthenes into olefins.
naphthenes into paraffin.
✅ The correct answer is option B.