Fertiliser Technology Questions and Answers

Multiple Choice Questions (MCQ) and Answers on Fertiliser Technology

Question 1 : Ammonium sulphate can be produced by reacting gypsum with

1. ammonia
2. ammonium carbonate
3. nitric acid
4. none of these

Answer : 2

Question 2 : Nitrogenous fertiliser is required

1. during the early stage of growth to promote development of stem and leaves.
2. for accelerating fruit formation in later stage of growth.
3. to lessen the effect of excessive potash application.
4. 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

1. Rourkela (under SAIL)
2. Bokaro (under SAIL)
3. Sindri (under FCI)
4. Baroda (under G.S.F.C.)

Answer : 3

Question 4 : Catalyst used in Haber’s process for ammonia production is

1. reduced iron oxide
2. nickel
3. vanadium pentoxide
4. silica gel

Answer : 1

Question 5 : Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium

1. carbonate
2. phosphate
3. bicarbonate
4. silicate

Answer : 1

Question 6 : Prilling tower is found in the flowsheet for the manufacture of

1. ammonia
2. urea
3. superphosphate
4. triple superphosphate

Answer : 2

Question 7 : Reaction of orthophosphoric acid with soda ash produces

1. sodium tripolyphosphate (STPP)
2. tricresyl phosphate
3. tributyl phosphate
4. nitrophosphate

Answer : 1

Question 8 : Urea is formed only

1. in liquid phase
2. in vapour phase
3. at very high temperature
4. at very low pressure (vacuum)

Answer : 1

Question 9 : Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction.

1. reversible
2. catalytic
3. exothermic
4. endothermic

Answer : 4

Question 10 : Electric process as compared to wet process (for the manufacture of phosphoric acid)

1. can use only high grade phosphate rock.
2. is used less frequently.
3. produces a valuable by-product called gypsum.
4. is weak acid process.

Answer : 2

Question 11 : P₂O₅ content in triple superphosphate is about __________ percent.

1. 42-50
2. 15-20
3. 85-90
4. 70-75

Answer : 1

Question 12 : H₃PO₄ is the chemical formula of __________ phosphoric acid.

1. pyro
2. ortho
3. meta
4. none of these

Answer : 2

Question 13 : Heating of orthophosphoric acid to 250°C produces

1. metaphosphoric acid
2. pyrophosphoric acid
3. no change in it
4. none of these

Answer : 2

Question 14 : Vapor phase reaction of ammonia & nitric acid to produce ammonium nitrate is termed as the __________ process.

1. Haber’s
2. Stengel
3. Le-chatlier’s
4. 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.

1. stabilisation
2. increasing the effectiveness
3. improving the strength & heat resistance
4. all 1, 2 & 3

Answer : 4

Question 16 : Ammonium sulphate fertiliser is

1. the highest concentration nitrogenous fertiliser.
2. the best fertiliser for paddy.
3. a basic fertiliser.
4. a neutral fertiliser.

Answer : 2

Question 17 : Lower temperature and large excess of ammonia in urea melt

1. increases biuret formation
2. decreases biuret formation
3. is undersirable
4. does not effect biuret formation

Answer : 2

Question 18 : Superphosphate is manufactured by reacting phosphate rock with

1. acetic acid
2. sulphuric acid
3. aluminium chloride
4. none of these

Answer : 2

Question 19 : Vetrocoke solution is

1. a mixture of K₂CO₃ and As₂O₃.
2. K₂SO₄.
3. a mixture of Na₂CO₃ and As₂O₃.
4. Na₂SO₄.

Answer : 1

Question 20 : In calcium ammonium nitrate (CAN) fertil-ser

1. nitrate nitrogen is quick acting
2. ammoniacal nitrogen is quick acting
3. nitrate nitrogen is slower acting
4. 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.

1. 60
2. 30
3. 95
4. 100

Answer : 1

Question 22 : Urea is a __________ fertiliser.

1. nitrogenous
2. potassic
3. phosphatic
4. none of these

Answer : 1

Question 23 : Calcium ammonium nitrate (CAN) is

1. a mixed fertiliser
2. a straight fertiliser
3. a complex fertiliser
4. 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

1. mono-ethanolamine (MEA)
2. slaked lime
3. ammoniacal liquor
4. Methyl-Ethyl Ketone (MEK)

Answer : 1

Question 25 : Which is the most suitable fertiliser for paddy ?

1. CAN
2. Ammonium sulphate
3. Ammonium nitrate
4. Superphosphate

Answer : 2

Question 26 : Pick out the wrong statement.

1. Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported under water.
2. Apatite is the principal material present in phosphate rock which is chemically Ca₁₀(PO₄)₆ (F, Cl, OH).
3. Urea is more hygroscopic than ammonium nitrate.
4. 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?

1. Calcium
2. Magnesium
3. Sulphur
4. 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. 1.5:1
2. 3.5:1
3. 10:1
4. 15:1

Answer : 2

Question 29 : (CH₃ C₆ H₄)₃ PO₄ is the chemical formula of

1. triple superphosphate
2. tricresyl phosphate
3. flourapatite
4. superphosphate

Answer : 2

Question 30 : Which is a catalyst promoter used in catalytic ammonia synthesis reaction ?

1. Al₂O₃
2. Cr₂O₃
3. K₂O
4. MnO

Answer : 3

Question 31 : Reaction of dilute sulphuric acid with phosphate rock produces

1. phosphoric acid
2. superphosphate
3. triple superphosphate
4. gypsum

Answer : 1

Question 32 : Phosphoric acid is produced in wet process from phosphate rock and

1. dilute H₂SO₄
2. concentrated H₂SO₄
3. concentrated NHO₃
4. concentrated HCl

Answer : 1

Question 33 : Base suspension fertiliser essentially contains

1. 13% N₂ and 43% P₂O₅
2. 43% N₂ and 13% P₂O₅
3. 43% N₂ and 13% K₂O
4. 43% K₂O and 43% P₂O₅

Answer : 1

Question 34 : Conditioners like finely divided peat are added to the fertiliser to

1. counteract burning.
2. avoid caking & hardening.
3. produce bulk.
4. increase its solubility.

Answer : 2

Question 35 : Liquid ammonia is not used as such a fertiliser in tropical countries like India, because

1. its N₂ content is very low.
2. it is very costly.
3. it will evaporate on spraying.
4. it is not available.

Answer : 3

Question 36 : During conversion of ammonium carbamate into urea, presence of large excess of water

1. increases the yield of urea.
2. adversely affects the yield of urea.
3. reduces the evaporator load by diluting the urea solution.
4. does not affect the yield of urea.

Answer : 2

Question 37 : Hydrogen content of coke oven gas is __________ percent.

1. 4
2. 22
3. 58
4. 84

Answer : 3

Question 38 : Pick out the wrong statement.

1. ‘Green acid’ is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid.
2. Chemically unreactive nature of red phosphorous is due to its polymeric structure.
3. Red phosphorous is the most reactive allotropic form of phosphorous.
4. 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

1. increase its nitrogen content.
2. cut down its production cost.
3. avoid the risk of explosion.
4. add extra nutrient as fertiliser.

Answer : 3

Question 40 : Action of phosphoric acid on rock phosphate produces

1. superphosphate
2. triple superphosphate
3. nitrophosphate
4. diammonium phosphate

Answer : 2

Question 41 : Catalyst used in the manufacture of NH₃ by Haber’s process is finely divided

1. nickel
2. iron
3. vanadium pentoxide
4. alumina

Answer : 2

Question 42 : Red phosphorous is changed into white phosphorous by

1. heating in presence of light.
2. melting under pressure.
3. vaporisation followed by condensation.
4. none of these.

Answer : 3

Question 43 : Urea is represented as

1. NH₂.CO.NH₂
2. NH₃CO.CH₃
3. NH.CO₂.NH
4. NH₃.CO₂.NH₃

Answer : 1

Question 44 : Two gas based fertiliser plants are located in

1. Maharashtra and Gujarat
2. Maharashtra and Orissa
3. Gujarat and Madhya Pradesh
4. Jharkhand and Chattisgarh

Answer : 1

Question 45 : Fertiliser plants get their N₂ requirements

1. by fractionation of liquified air.
2. by dissociating oxides of nitrogen.
3. from coal gas (coke oven gas).
4. from producer gas.

Answer : 1

Question 46 : Phosphorus vapour comprises of

1. P
2. P₂
3. P₃
4. 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.

1. 50-80
2. 250-400
3. 1000-1200
4. 800-900

Answer : 2

Question 48 : Commercial fertilisers are available mostly in the form of

1. powder
2. grannules
3. lumps
4. flakes

Answer : 2

Question 49 : Pick out the wrong statement.

1. All the nitrogenous fertilisers are not soluble in water.
2. A straight fertiliser contains only one nutrient.
3. Calcium cynamide is used as weed killer in onion fields.
4. 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

1. thermal cracking
2. steam reforming
3. partial oxidation
4. hydrogenation

Answer : 2