3671. Urea is formed only
In liquid phase
In vapour phase
At very high temperature
At very low pressure (vacuum)
✅ The correct answer is option A.
Chemical Engineering
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3672. Phosphatic fertilisers
Are useful during early stage of the plant growth
Accelerate fruit formation in later stages of growth
Lessen the effect of excessive nitrogen application
None of these
✅ The correct answer is option B.
3673. Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at __________ °C.
250-300
500-750
950-1050
1400-1450
✅ The correct answer is option D.
3674. Raw materials for urea production are
CO₂ and N₂
CO₂, H₂ and N₂
NH₃ and CO
HNO₃ and CaCO₃
✅ The correct answer is option B.
3675. Temperature and pressure in ammonia converter is
200 atm, 1000°C
450 atm, 200°C
450 atm, 550°C
450 atm, 1000°C
✅ The correct answer is option C.
3676. Low grade coal is __________ to produce ammonia synthesis gas.
Hydrogenated
Liquefied
Gasified
Dehydrogenated
✅ The correct answer is option C.
3677. Hydrogen is recovered from coke oven gas on commercial scale (as practised in fertiliser plant at Rourkela) by
Adsorption on palladium
Cryogenic operations (low temperature cooling)
Absorption (using ethanolamine or pyragalloll solution)
None of these
✅ The correct answer is option B.
3679. Lower temperature and large excess of ammonia in urea melt
Increases biuret formation
Decreases biuret formation
Is undersirable
Does not effect biuret formation
✅ The correct answer is option B.
3680. The essential ingradient of all the synthesis gas is
H₂
O₂
CO₂
N₂
✅ The correct answer is option A.