Multiple Choice Questions (MCQ) and Answers on Fertiliser Technology
Question 1 : Ammonium sulphate can be produced by reacting gypsum with
- ammonia
- ammonium carbonate
- nitric acid
- none of these
Answer : 2
Question 2 : Nitrogenous fertiliser is required
- during the early stage of growth to promote development of stem and leaves.
- for accelerating fruit formation in later stage of growth.
- to lessen the effect of excessive potash application.
- none of these.
Answer : 1
Question 3 : Fertiliser plant making ammonium sulphate employing gypsum-ammonia reaction (usual practice is to use ammonia and sulphuric acid) is located at
- Rourkela (under SAIL)
- Bokaro (under SAIL)
- Sindri (under FCI)
- Baroda (under G.S.F.C.)
Answer : 3
Question 4 : Catalyst used in Haber’s process for ammonia production is
- reduced iron oxide
- nickel
- vanadium pentoxide
- silica gel
Answer : 1
Question 5 : Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium
- carbonate
- phosphate
- bicarbonate
- silicate
Answer : 1
Question 6 : Prilling tower is found in the flowsheet for the manufacture of
- ammonia
- urea
- superphosphate
- triple superphosphate
Answer : 2
Question 7 : Reaction of orthophosphoric acid with soda ash produces
- sodium tripolyphosphate (STPP)
- tricresyl phosphate
- tributyl phosphate
- nitrophosphate
Answer : 1
Question 8 : Urea is formed only
- in liquid phase
- in vapour phase
- at very high temperature
- at very low pressure (vacuum)
Answer : 1
Question 9 : Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction.
- reversible
- catalytic
- exothermic
- endothermic
Answer : 4
Question 10 : Electric process as compared to wet process (for the manufacture of phosphoric acid)
- can use only high grade phosphate rock.
- is used less frequently.
- produces a valuable by-product called gypsum.
- is weak acid process.
Answer : 2
Question 11 : P2O5 content in triple superphosphate is about __________ percent.
- 42-50
- 15-20
- 85-90
- 70-75
Answer : 1
Question 12 : H3PO4 is the chemical formula of __________ phosphoric acid.
- pyro
- ortho
- meta
- none of these
Answer : 2
Question 13 : Heating of orthophosphoric acid to 250°C produces
- metaphosphoric acid
- pyrophosphoric acid
- no change in it
- none of these
Answer : 2
Question 14 : Vapor phase reaction of ammonia & nitric acid to produce ammonium nitrate is termed as the __________ process.
- Haber’s
- Stengel
- Le-chatlier’s
- Du-pont’s
Answer : 2
Question 15 : 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.
- stabilisation
- increasing the effectiveness
- improving the strength & heat resistance
- all 1, 2 & 3
Answer : 4
Question 16 : Ammonium sulphate fertiliser is
- the highest concentration nitrogenous fertiliser.
- the best fertiliser for paddy.
- a basic fertiliser.
- a neutral fertiliser.
Answer : 2
Question 17 : Lower temperature and large excess of ammonia in urea melt
- increases biuret formation
- decreases biuret formation
- is undersirable
- does not effect biuret formation
Answer : 2
Question 18 : Superphosphate is manufactured by reacting phosphate rock with
- acetic acid
- sulphuric acid
- aluminium chloride
- none of these
Answer : 2
Question 19 : Vetrocoke solution is
- a mixture of K2CO3 and As2O3.
- K2SO4.
- a mixture of Na2CO3 and As2O3.
- Na2SO4.
Answer : 1
Question 20 : In calcium ammonium nitrate (CAN) fertil-ser
- nitrate nitrogen is quick acting
- ammoniacal nitrogen is quick acting
- nitrate nitrogen is slower acting
- none of these
Answer : 1
Question 21 : The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about __________ percent.
- 60
- 30
- 95
- 100
Answer : 1
Question 22 : Urea is a __________ fertiliser.
- nitrogenous
- potassic
- phosphatic
- none of these
Answer : 1
Question 23 : Calcium ammonium nitrate (CAN) is
- a mixed fertiliser
- a straight fertiliser
- a complex fertiliser
- not a fertiliser ; it is an explosive
Answer : 3
Question 24 : CO2 present in reformed gas (obtained by steam reforming of naphtha) is removed by absorbing in
- mono-ethanolamine (MEA)
- slaked lime
- ammoniacal liquor
- Methyl-Ethyl Ketone (MEK)
Answer : 1
Question 25 : Which is the most suitable fertiliser for paddy ?
- CAN
- Ammonium sulphate
- Ammonium nitrate
- Superphosphate
Answer : 2
Question 26 : Pick out the wrong statement.
- Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported under water.
- Apatite is the principal material present in phosphate rock which is chemically Ca10(PO4)6 (F, Cl, OH).
- Urea is more hygroscopic than ammonium nitrate.
- Nitrogen fixation means the process of bringing atmospheric nitrogen into combination i.e. into nitrogen compound form.
Answer : 3
Question 27 : Which of the following does not come under the category of ‘secondary nutrient’ for plant growth?
- Calcium
- Magnesium
- Sulphur
- Oxygen
Answer : 4
Question 28 : Steam reforming of naphtha is a source of hydrogen production for nitrogeneous fertiliser industry. What is the usual ratio of steam to carbon maintained in the process of steam reforming of naphtha ?
- 1.5:1
- 3.5:1
- 10:1
- 15:1
Answer : 2
Question 29 : (CH3 C6 H4)3 PO4 is the chemical formula of
- triple superphosphate
- tricresyl phosphate
- flourapatite
- superphosphate
Answer : 2
Question 30 : Which is a catalyst promoter used in catalytic ammonia synthesis reaction ?
- Al2O3
- Cr2O3
- K2O
- MnO
Answer : 3
Question 31 : Reaction of dilute sulphuric acid with phosphate rock produces
- phosphoric acid
- superphosphate
- triple superphosphate
- gypsum
Answer : 1
Question 32 : Phosphoric acid is produced in wet process from phosphate rock and
- dilute H2SO4
- concentrated H2SO4
- concentrated NHO3
- concentrated HCl
Answer : 1
Question 33 : Base suspension fertiliser essentially contains
- 13% N2 and 43% P2O5
- 43% N2 and 13% P2O5
- 43% N2 and 13% K2O
- 43% K2O and 43% P2O5
Answer : 1
Question 34 : Conditioners like finely divided peat are added to the fertiliser to
- counteract burning.
- avoid caking & hardening.
- produce bulk.
- increase its solubility.
Answer : 2
Question 35 : Liquid ammonia is not used as such a fertiliser in tropical countries like India, because
- its N2 content is very low.
- it is very costly.
- it will evaporate on spraying.
- it is not available.
Answer : 3
Question 36 : During conversion of ammonium carbamate into urea, presence of large excess of water
- increases the yield of urea.
- adversely affects the yield of urea.
- reduces the evaporator load by diluting the urea solution.
- does not affect the yield of urea.
Answer : 2
Question 37 : Hydrogen content of coke oven gas is __________ percent.
- 4
- 22
- 58
- 84
Answer : 3
Question 38 : Pick out the wrong statement.
- ‘Green acid’ is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid.
- Chemically unreactive nature of red phosphorous is due to its polymeric structure.
- Red phosphorous is the most reactive allotropic form of phosphorous.
- Red phosphorous, which is used in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation.
Answer : 3
Question 39 : Ammonium nitrate (a fertiliser) is coated with limestone powder to
- increase its nitrogen content.
- cut down its production cost.
- avoid the risk of explosion.
- add extra nutrient as fertiliser.
Answer : 3
Question 40 : Action of phosphoric acid on rock phosphate produces
- superphosphate
- triple superphosphate
- nitrophosphate
- diammonium phosphate
Answer : 2
Question 41 : Catalyst used in the manufacture of NH3 by Haber’s process is finely divided
- nickel
- iron
- vanadium pentoxide
- alumina
Answer : 2
Question 42 : Red phosphorous is changed into white phosphorous by
- heating in presence of light.
- melting under pressure.
- vaporisation followed by condensation.
- none of these.
Answer : 3
Question 43 : Urea is represented as
- NH2.CO.NH2
- NH3CO.CH3
- NH.CO2.NH
- NH3.CO2.NH3
Answer : 1
Question 44 : Two gas based fertiliser plants are located in
- Maharashtra and Gujarat
- Maharashtra and Orissa
- Gujarat and Madhya Pradesh
- Jharkhand and Chattisgarh
Answer : 1
Question 45 : Fertiliser plants get their N2 requirements
- by fractionation of liquified air.
- by dissociating oxides of nitrogen.
- from coal gas (coke oven gas).
- from producer gas.
Answer : 1
Question 46 : Phosphorus vapour comprises of
- P
- P2
- P3
- P4
Answer : 4
Question 47 : Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air.
- 50-80
- 250-400
- 1000-1200
- 800-900
Answer : 2
Question 48 : Commercial fertilisers are available mostly in the form of
- powder
- grannules
- lumps
- flakes
Answer : 2
Question 49 : Pick out the wrong statement.
- All the nitrogenous fertilisers are not soluble in water.
- A straight fertiliser contains only one nutrient.
- Calcium cynamide is used as weed killer in onion fields.
- The phosphorous nutrient makes the plant stem stronger and increases its branches.
Answer : 1
Question 50 : Ammonia synthesis gas is produced from natural gas by
- thermal cracking
- steam reforming
- partial oxidation
- hydrogenation
Answer : 2