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Quiz 4
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Q.1
Electric furnace method for production of phosphorous uses phosphate rock
And phosphoric acid
And coke
And sulphuric acid
Silica and coke
Q.2
Reaction of orthophosphoric acid with soda ash produces
Sodium tripolyphosphate (STPP)
Tricresyl phosphate
Tributyl phosphate
Nitrophosphate
Q.3
Red phosphorous is changed into white phosphorous by
Heating in presence of light
Melting under pressure
Vaporisation followed by condensation
None of these
Q.4
Which nutrient in fertiliser makes the plant stems stronger and increases branching?
Nitrogen
Phosphorous
Potassium
Calcium
Q.5
Nitrolime is
Calcium nitrate
Calcium ammonium nitrate
A mixture of nitric acid and lime
A mixture of ammonium nitrate and calcium nitrate
Q.6
Heating a mixture of phosphate rock, coke and sand in an electric furnace produces
Phosphoric acid
Ammonium phosphate
Phosphorous
Superphosphate
Q.7
In the manufacture of orthophosphoric acid by strong H₂SO₄ leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesriable
CaSO₄ .½H₂O and CaSO₄ crystals
Pyrophosphoric acid
Metaphosphoric acid
All of the above
Q.8
Monte catini process is used for the manufacture of
Nitric acid
Phosphoric acid
Urea
Calcium ammonium nitrate (CAN)
Q.9
Low grade phosphate rock can be used in electrical furnace, because
Of the better CaO/SiO₂ balance for slag formation
CaO content is less
It is cheap
It produces low cost product
Q.10
Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the
Presence of an inert atmosphere
Presence of a reducing atmosphere
Absence of air
Presence of an oxidising atmosphere
Q.11
Pick out the correct statement.
Reaction of NH₃ with HNO₃ to produce (NH₄)₂NO₃ is endothermic
With increase in NH₃/CO₂ ratio, urea yield decreases for a given temperature, pressure and total feed rate
Biuret (an intermediate during urea manufacture) is toxic to seeds and animals
Both B and C
Q.12
The composition of fresh feed to the high temperature, high pressure urea autoclave is
Excess liquid ammonia and liquefied CO₂
Excess liquid ammonia and compressed CO₂ gas
Liquid ammonia and excess compressed CO₂
Compressed ammonia gas and excess compressed CO₂
Q.13
Potassic fertilisers do not promote the development of
Stems & leaves during early stage of plant growth
Starches of potatoes & grains
Sugar of fruits & vegetables
Fibrous materials of plants
Q.14
H₄P₂O₇ is the chemical formula of __________ phosphoric acid.
Pyro
Ortho
Meta
None of these
Q.15
Which of the following is a natural inorganic fertiliser?
Chile salt petre
Oilcake
Gobar mannure
None of these
Q.16
Which of the following solvents is used for the extraction of H₃PO₄ from CaCl₂ solution during manufacture of ortho-phosphoric acid by wet process employing hydrochloric acid leaching?
Iso propyl alcohol
Butyl alcohol
Toluene
Hexane
Q.17
Which of the following is not a mixed fertiliser?
Nitrophosphate
Calcium ammonium nitrate (CAN)
Ammonium phosphate
None of these
Q.18
Heating of orthophosphoric acid to about 900°C, produces
Metaphosphoric acid
Pyrophosphoric acid
No change in it
None of these
Q.19
A potassic fertiliser contains 50% K₂O. It could be
Potassium sulphate
Potassium chloride
A mixture of NaCl+ KCl
None of these
Q.20
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
Q.21
Biuret formation in urea is kept at minimum (< 1 %), because it is
Corrosive in nature
Toxic and harmful to some crops
Helpful in decomposition of urea
Explosive in nature
Q.22
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
Q.23
With increases in pressure, the conversion of ammonium carbamate into urea
Increases
Decreases
Remains unaltered
Can either increase or decrease depends on biuret content
Q.24
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
Q.25
Commercial production of hydrogen for the manufacture of nitrogeneous fertilisers is done by
Steam reforming of naphtha and cracking of natural gas
Electrolysis of water
Cryogenic separation of hydrogen from coke oven gas
All of the above
Q.26
Which of the following nitrogenous fertilisers has the highest percentage of nitrogen?
Calcium nitrate
Calcium ammonium nitrate (CAN)
Urea
Ammonium sulphate
Q.27
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
Q.28
Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils?
Urea
CAN
Ammonium sulphate
Calcium cyanamide
Q.29
Multistage operation (as in the case of catalytic oxidation of SO₂) is not carried out for NH₃ synthesis, because of
Comparatively higher pressure drop
High cost of the high pressure vessel used for the reactor
Higher pumping cost
Chances of entrainment and disturbance of catalyst bed
Q.30
Ammonium sulphate fertiliser is
The highest concentration nitrogenous fertiliser
The best fertiliser for paddy
A basic fertiliser
A neutral fertiliser
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