1) ______________ is the most suitable fertiliser for paddy? a. Urea b. Ammonium sulphate c. Superphosphate d. Potassium nitrate
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2) Phosphorus vapour comprises of ___________________? a. P b. P2 c. P3 d. P4
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3) Reaction of Cresylic acid with _____________ produces Tricresyl phosphate? a. Phosphorous pentoxide b. Phosphorous oxychloride c. Ammonium phosphate d. Calcium phosphate
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4) 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.
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5) 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
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6) Naphtha in a fertiliser plant is used as a source of___________________? a. Fuel b. H2 c. N2 d. O2
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7) 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
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8) Phosphatic fertiliser is graded based on its _____________ content? a. P2O3 b. PCl5 c. P2O5 d. H3PO4
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9) 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
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10) 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
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11) Reaction of ______________ acid with phosphate rock produces superphosphates? a. Hydrochloric b. Sulphuric c. Nitric d. Phosphoric
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12) HPO3 is the chemical formula of ______________ phosphoric acid? a. Pyro b. Ortho c. Meta d. None of these
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13) (CH3 C6 H4)3 PO4 is the chemical formula of__________________? a. Triple superphosphate b. Tricresyl phosphate c. Fluorapatite d. Superphosphate
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14) During nitric acid manufacture, catalytic oxidation of ammonia at 800°C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH3 to NO is about ______________ percent? a. 38 b. 68 c. 82 d. 98
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15) Ammonia synthesis reaction is______________________? a. Exothermic b. Endothermic c. Autocatalytic d. None of these
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16) Nitrogenous fertiliser is required__________________? a. During the early stage of growth to promote development of stem and leaves b. For accelerating fruit formation in later stage of growth c. To lessen the effect of excessive potash application d. None of these
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17) Commercial fertilisers are available mostly in the form of__________________? a. Powder b. Granules c. Lumps d. Flakes
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18) A fertiliser plant is classified as a gas based fertiliser plant, when it uses ______________ gas as a source of hydrogen for the manufacture of ammonia? a. Coke oven b. Producer c. Natural d. Coal
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19) Catalyst used in ammonia synthesis uses ____________ as a promoter? a. Pt b. K2O c. Al2O3 d. Ni
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20) Which is the most suitable fertiliser for paddy ? a. CAN b. Ammonium sulphate c. Ammonium nitrate d. Superphosphate
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