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
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
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
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
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
Which of the following is not a measure component necessarily to be present in fertilisers ?
(A) Nitrogen
(B) Potassium
(C) Phosphorous
(D) Sulphur
Fertiliser plants get their N2 requirements _____________________?
(A) By fractionation of liquefied air
(B) By dissociating oxides of nitrogen
(C) From coal gas (coke oven gas)
(D) From producer gas
Phosphatic fertiliser is graded based on its _____________ content?
(A) P2O3
(B) PCl5
(C) P2O5
(D) H3PO4
Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N2 & H2 is high. The presence of promoter along with the catalyst helps in ______________ of the catalyst ?
(A) Stabilisation
(B) Increasing the effectiveness
(C) Improving the strength & heat resistance
(D) All A, B & C
Naphtha in a fertiliser plant is used as a source of___________________?
(A) Fuel
(B) H2
(C) N2
(D) O2