Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of ____________ this is normally not done?

A. Increased biuret formation
B. High corrosion rate
C. Increased cost of equipment
D. All A., B. & C.

The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about ____________ percent?

A. 60
B. 30
C. 95
D. 100

Heating of coke, sand & phosphate rock in an electric furnace is done for the manufacture of_________________?

A. Phosphoric acid
B. Superphosphate
C. Phosphorous
D. Triple superphosphate

Lower temperature and large excess of ammonia in urea melt__________________?

A. Increases biuret formation
B. Decreases biuret formation
C. Is undesirable
D. Does not effect biuret formation

Bio-fertilisers are cheaper, renewable and pollution free. They improve the _____________ of the soil?

A. Nutrient supply
B. Texture
C. Water holding capacity
D. All A., B. and C.

Montecatini process is used for the manufacture of____________________?

A. Nitric acid
B. Phosphoric acid
C. Urea
D. Calcium ammonium nitrate (CAN)

Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium___________________?

A. Carbonate
B. Phosphate
C. Bicarbonate
D. Silicate

Which of the following is the costliest method for commercial production of hydrogen for ammonia synthesis ?

A. H2 separation from coke oven gas
B. Steam reforming of naphtha
C. Cracking of natural gas
D. Electrolysis of water

Urea is formed only____________________?

A. In liquid phase
B. In vapour phase
C. At very high temperature
D. At very low pressure (vacuum)

A mixture of phosphate rock ______________ is heated in an electric furnace to produce phosphorous?

A. Salt & coke
B. Sand & coke
C. And coke
D. And sand