Multiple Choice Questions and Answers (MCQ) on Fertiliser Technology
01. Sodium tri poly phosphate (STPP) is chemically represented as
(A) Na5P3O10
(B) Na4P3O8
(C) Na3P4O6
(D) Na2PO4
Answer: Option A
02. Which of the following does not come under the category of ‘micro-nutrient’ for plant growth?
(A) Chlorine
(B) Iron
(C) Boron
(D) Carbon
Answer: Option D
03. Raw materials for nitric acid manufacture are
(A) Hydrogen peroxide, air and water
(B) Anhydrous ammonia and air
(C) Anhydrous ammonia, air and water
(D) Wet ammonia, air and water
Answer: Option C
04. H4P2O7 is the chemical formula of __________ phosphoric acid.
(A) Pyro
(B) Ortho
(C) Meta
(D) None of these
Answer: Option A
05. Plant tranquillisers
(A) Hold back stem growth and halt plants at a desired height
(B) Cause early maturation of plants
(C) Accelerate ripening of food and grain
(D) Produce seedless fruit
Answer: Option A
06. Catalytic ammonia synthesis reaction as in Haber’s process is
(A) Endothermic
(B) Exothermic
(C) Irreversible
(D) None of these
Answer: Option B
07. Nitrogen content of a nitrogenous fertiliser is 35%. It could be
(A) Urea
(B) Ammonium nitrate
(C) Calcium ammonium nitrate (CAN)
(D) Ammonium sulphate
Answer: Option B
08. Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils?
(A) Urea
(B) CAN
(C) Ammonium sulphate
(D) Calcium cyanamide
Answer: Option D
09. Nitrogen content of urea is about __________ percent.
(A) 10
(B) 46
(C) 80
(D) 94
Answer: Option B
10. The most suitable fertiliser for accelerating seeding or fruit formation in later stages of plant growth is __________ fertiliser.
(A) Nitrogenous
(B) Phosphatic
(C) Potassic
(D) None of these
Answer: Option B
11. With increases in pressure, the conversion of Ammonium carbamate into urea
(A) Increases
(B) Decreases
(C) Remains unaltered
(D) Can either increase or decrease depends on biuret content
Answer: Option A
12. Triple superphosphate is made by reacting phosphate rock with __________ acid.
(A) Phosphoric
(B) Nitric
(C) Sulphuric
(D) Hydrochloric
Answer: Option A
13. Nitric acid is produced on commercial scale in a fertiliser plant by
(A) Oxidation of ammonia
(B) CaNO3 + H2SO4 reaction
(C) Passing air through high voltage electric arc
(D) None of these
Answer: Option A
14. __________ catalyst is used in the production of urea from CO2 and NH3.
(A) Vanadium pentoxide
(B) No
(C) Alumina
(D) Nickel
Answer: Option B
15. In ammonia synthesis (N2 + 3H2 = 2NH3), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should be carried out at
(A) Low pressure
(B) High pressure
(C) Very high temperature
(D) Atmospheric pressure; as the pressure has no effect on conversion
Answer: Option B
16. Ammonium nitrate is
(A) Having about 40% N2
(B) Not hygroscopic
(C) Not prone to explosive thermal decomposition
(D) Mixed with limestone powder to reduce its explosive nature before using it as a fertilizer
Answer: Option D
17. Tricresyl phosphate is chemically represented as
(A) (CH3 C6 H4)3 PO4
(B) Ca10(PO4)3F6
(C) (NH4)2HPO4
(D) NH4H2PO4
Answer: Option A
18. Reaction of anhydrous liquid ammonia with ortho-phosphoric acid produces
(A) Ammonium phosphate
(B) Superphosphate
(C) Triple superphosphate
(D) None of these
Answer: Option A
19. Nitrolime is
(A) Calcium nitrate
(B) Calcium ammonium nitrate
(C) A mixture of nitric acid and lime
(D) A mixture of ammonium nitrate and calcium nitrate
Answer: Option B
20. 5-10-5 fertilisers mean that they contain
(A) 5, 10, 5% respectively of N2, P2O5 and K2O
(B) Only 5 to 10% active fertiliser constituents
(C) 5 to 10% filler & carrier of soil conditioners
(D) None of these
Answer: Option A
21. Multistage operation (as in the case of catalytic oxidation of SO2) is not carried out for NH3 synthesis, because of
(A) Comparatively higher pressure drop
(B) High cost of the high pressure vessel used for the reactor
(C) Higher pumping cost
(D) Chances of entrainment and disturbance of catalyst bed
Answer: Option B
22. Hydrogen is recovered from coke oven gas on commercial scale (as practised in fertiliser plant at Rourkela) by
(A) Adsorption on palladium
(B) Cryogenic operations (low temperature cooling)
(C) Absorption (using ethanolamine or pyrogallol solution)
(D) None of these
Answer: Option B
23. Steam reforming of naphtha produces ammonia synthesis gas. This is a/an __________ process.
(A) Autocatalytic
(B) Endothermic
(C) Exothermic
(D) Non-catalytic
Answer: Option B
24. Catalyst used in steam reforming of naphtha is
(A) Nickel
(B) Platinum
(C) Silica gel
(D) Rhodium
Answer: Option A
25. An increase in the NH3/CO2 ratio in urea manufacture results in
(A) Increased degree of conversion of CO2 to urea
(B) Decreased degree of conversion of NH3 to urea
(C) Decreased yield of urea
(D) Decreased specific volume of molten mass
Answer: Option A