______________ is the most suitable fertiliser for paddy?

A. Urea
B. Ammonium sulphate
C. Superphosphate
D. Potassium nitrate

Phosphorus vapour comprises of ___________________?

A. P
B. P2
C. P3
D. P4

Reaction of Cresylic acid with _____________ produces Tricresyl phosphate?

A. Phosphorous pentoxide
B. Phosphorous oxychloride
C. Ammonium phosphate
D. Calcium phosphate

Commercial production of hydrogen for the manufacture of nitrogenous fertilisers is done by________________?

A. Steam reforming of naphtha and cracking of natural gas
B. Electrolysis of water
C. Cryogenic separation of hydrogen from coke oven gas
D. All A., B. and C.

Low grade phosphate rock can be used in electrical furnace, because__________________?

A. Of the better CaO/SiO2 balance for slag formation
B. CaO content is less
C. It is cheap
D. It produces low cost product

Naphtha in a fertiliser plant is used as a source of___________________?

A. Fuel
B. H2
C. N2
D. O2

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

Phosphatic fertiliser is graded based on its _____________ content?

A. P2O3
B. PCl5
C. P2O5
D. H3PO4

Which of the following gasifiers can be attached to coal based fertiliser plants ?

A. Lurgi (high pressure) gasifier
B. Kopper-Totzek gasifier
C. Gasifier working at 20 atm
D. Gasifier working at 40 atm

Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at ____________ °C in absence of air?

A. 50-80
B. 250-400
C. 1000-1200
D. 800-900