MCQOPTIONS
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MCQOPTIONS
This section includes 288 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
A fertiliser contains 82% N₂. It could be |
| A. | Urea |
| B. | Liquid NH₃ |
| C. | Ammonium nitrate |
| D. | None of these |
| Answer» C. Ammonium nitrate | |
| 52. |
A nitrogenous fertiliser contains 20% N₂. It could be |
| A. | Ammonium nitrate |
| B. | Calcium ammonium nitrate (CAN) |
| C. | Urea |
| D. | Ammonium chloride |
| Answer» C. Urea | |
| 53. |
(CH₃ C₆ H₄)₃ PO₄ is the chemical formula of |
| A. | Triple superphosphate |
| B. | Tricresyl phosphate |
| C. | Flourapatite |
| D. | Superphosphate |
| Answer» C. Flourapatite | |
| 54. |
H₃PO₄ is the chemical formula of __________ phosphoric acid. |
| A. | Pyro |
| B. | Ortho |
| C. | Meta |
| D. | None of these |
| Answer» C. Meta | |
| 55. |
Temperature and pressure in urea autoclave is |
| A. | 120°C and 300 atm |
| B. | 190°C and 200 atm |
| C. | 400°C and 550 atm |
| D. | 200°C and 10 atm |
| Answer» C. 400°C and 550 atm | |
| 56. |
Which fertiliser is made (using coke oven gas) in by products plant of an integrated steel plant? |
| A. | Urea |
| B. | CAN |
| C. | Ammonium sulphate |
| D. | Superphosphate |
| Answer» D. Superphosphate | |
| 57. |
HPO₃ is the chemical formula of __________ phosphoric acid. |
| A. | Pyro |
| B. | Ortho |
| C. | Meta |
| D. | None of these |
| Answer» D. None of these | |
| 58. |
P₂O₅ percentage in the phosphoric acid produced by wet process is about |
| A. | 10 |
| B. | 30 |
| C. | 50 |
| D. | 70 |
| Answer» C. 50 | |
| 59. |
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 |
| Answer» E. | |
| 60. |
Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the |
| A. | Presence of an inert atmosphere |
| B. | Presence of a reducing atmosphere |
| C. | Absence of air |
| D. | Presence of an oxidising atmosphere |
| Answer» D. Presence of an oxidising atmosphere | |
| 61. |
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 of the above |
| Answer» E. | |
| 62. |
H₄P₂O₇ is the chemical formula of __________ phosphoric acid. |
| A. | Pyro |
| B. | Ortho |
| C. | Meta |
| D. | None of these |
| Answer» B. Ortho | |
| 63. |
Which nutrient in fertiliser makes the plant stems stronger and increases branching? |
| A. | Nitrogen |
| B. | Phosphorous |
| C. | Potassium |
| D. | Calcium |
| Answer» C. Potassium | |
| 64. |
Which of the following is not a mixed fertiliser? |
| A. | Nitrophosphate |
| B. | Calcium ammonium nitrate (CAN) |
| C. | Ammonium phosphate |
| D. | None of these |
| Answer» C. Ammonium phosphate | |
| 65. |
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? |
| A. | Iso propyl alcohol |
| B. | Butyl alcohol |
| C. | Toluene |
| D. | Hexane |
| Answer» C. Toluene | |
| 66. |
Which of the following is a natural inorganic fertiliser? |
| A. | Chile salt petre |
| B. | Oilcake |
| C. | Gobar mannure |
| D. | None of these |
| Answer» B. Oilcake | |
| 67. |
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 |
| A. | CaSO₄ .½H₂O and CaSO₄ crystals |
| B. | Pyrophosphoric acid |
| C. | Metaphosphoric acid |
| D. | All of the above |
| Answer» B. Pyrophosphoric acid | |
| 68. |
Raw materials required for the production of CAN (Calcium ammonium nitrate) is NH₃ |
| A. | HNO₃ & limestone |
| B. | CO₂ & H₂SO₄ |
| C. | HNO₃ & NH₄Cl |
| D. | CO₂ & KNO₃ |
| Answer» B. CO₂ & H₂SO₄ | |
| 69. |
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» B. Decreased degree of conversion of NH₃ to urea | |
| 70. |
Conversion achieved in HNO₃ synthesis with the use of platinum catalyst is about 95-97%. The rate of formation of nitrogen dioxide from the oxidation of nitric acid is favoured by |
| A. | Decreasing the pressure |
| B. | Decreasing the temperature |
| C. | Increasing the temperature |
| D. | None of these |
| Answer» D. None of these | |
| 71. |
Which is the best fertiliser for paddy? |
| A. | Ammonium sulphate |
| B. | Nitro-phosphate |
| C. | Superphosphate |
| D. | Potassium nitrate |
| Answer» B. Nitro-phosphate | |
| 72. |
CO₂ present in reformed gas (obtained by steam reforming of naphtha) is removed by absorbing in |
| A. | Mono-ethanolamine (MEA) |
| B. | Slaked lime |
| C. | Ammoniacal liquor |
| D. | Methyl-Ethyl Ketone (MEK) |
| Answer» B. Slaked lime | |
| 73. |
Which of the following nitrogenous fertilisers has the highest percentage of nitrogen? |
| A. | Calcium nitrate |
| B. | Calcium ammonium nitrate (CAN) |
| C. | Urea |
| D. | Ammonium sulphate |
| Answer» D. Ammonium sulphate | |
| 74. |
Optimum reaction temperature in steam reforming of naphtha is __________ °C. |
| A. | 700 - 1000 |
| B. | 300 - 450 |
| C. | 1500-1700 |
| D. | 100-200 |
| Answer» B. 300 - 450 | |
| 75. |
Catalyst used in the manufacture of NH₃ by Haber's process is finely divided |
| A. | Nickel |
| B. | Iron |
| C. | Vanadium pentoxide |
| D. | Alumina |
| Answer» C. Vanadium pentoxide | |
| 76. |
In the manufacture of H₃ PO₄ (ortho), ; strong H₂ SO₄ leaching wet process as compared to electric furnace process |
| A. | Uses lower grade phosphate rock |
| B. | Requires lower capital investment in the plant |
| C. | Produces lower purity acid |
| D. | Is very costly |
| Answer» D. Is very costly | |
| 77. |
Reaction of phosphate rock with 98% H₂SO₄ produces |
| A. | Orthophosphoric acid |
| B. | Superphosphate |
| C. | White phosphorous |
| D. | None of these |
| Answer» B. Superphosphate | |
| 78. |
P₂O₅ content in superphosphate is about __________ percent. |
| A. | 30-35 |
| B. | 15-20 |
| C. | 65-70 |
| D. | 85-90 |
| Answer» C. 65-70 | |
| 79. |
P₂O₅ content in triple superphosphate is about __________ percent. |
| A. | 42-50 |
| B. | 15-20 |
| C. | 85-90 |
| D. | 70-75 |
| Answer» B. 15-20 | |
| 80. |
Triple superphosphate which contains about 46% P₂O₅ is produced by the reaction of phosphate rock with ortho phosphoric acid of____percent concentration. |
| A. | 25-28 |
| B. | 52-54 |
| C. | 75-80 |
| D. | > 98 |
| Answer» C. 75-80 | |
| 81. |
Promoter used in NH₃ synthesis catalyst is |
| A. | K₂O |
| B. | SiO₃ |
| C. | V₂O₅ |
| D. | U₂O₃ |
| Answer» D. U₂O₃ | |
| 82. |
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» C. Very high temperature | |
| 83. |
A phosphatic fertiliser contains 16% P₂O₅. It could be |
| A. | Dicalcium phosphate |
| B. | Superphosphate |
| C. | Triple superphosphate |
| D. | None of these |
| Answer» C. Triple superphosphate | |
| 84. |
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 |
| Answer» C. Gasifier working at 20 atm | |
| 85. |
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» C. Higher pumping cost | |
| 86. |
A potassic fertiliser contains 50% K₂O. It could be |
| A. | Potassium sulphate |
| B. | Potassium chloride |
| C. | A mixture of NaCl+ KCl |
| D. | None of these |
| Answer» B. Potassium chloride | |
| 87. |
Heating of orthophosphoric acid to about 900°C, produces |
| A. | Metaphosphoric acid |
| B. | Pyrophosphoric acid |
| C. | No change in it |
| D. | None of these |
| Answer» B. Pyrophosphoric acid | |
| 88. |
Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature$ |
| A. | rate of reaction is very low. |
| B. | very high pressure is required resulting in costly pressure vessel. |
| C. | space velocity of gas is very low resulting in decreased conversion. |
| D. | none of these |
| Answer» B. very high pressure is required resulting in costly pressure vessel. | |
| 89. |
Biuret formation in urea is kept at minimum (< 1 %), because it is |
| A. | corrosive in nature. |
| B. | toxic and harmful to some crops. |
| C. | helpful in decomposition of urea. |
| D. | explosive in nature. |
| Answer» C. helpful in decomposition of urea. | |
| 90. |
Optimum reaction temperature in steam reforming of naphtha is __________ °C.$ |
| A. | 700 - 1000 |
| B. | 300 - 450 |
| C. | 1500-1700 |
| D. | 100-200 |
| Answer» B. 300 - 450 | |
| 91. |
Effectiveness of a fertiliser is independent of the |
| A. | nature of soil |
| B. | type of crop |
| C. | pH of soil |
| D. | none of these |
| Answer» E. | |
| 92. |
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 pyragalloll solution). |
| D. | none of these. |
| Answer» C. absorption (using ethanolamine or pyragalloll solution). | |
| 93. |
Temperature and pressure in ammonia converter is |
| A. | 200 atm, 1000°C |
| B. | 450 atm, 200°C |
| C. | 450 atm, 550°C |
| D. | 450 atm, 1000°C |
| Answer» D. 450 atm, 1000¬∞C | |
| 94. |
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» C. very high temperature. | |
| 95. |
In natural gas, the C/H ratio (by weight) varies in the range of |
| A. | 43558 |
| B. | 43746 |
| C. | 15-17 |
| D. | 20-25 |
| Answer» B. 43746 | |
| 96. |
Nitrogen content of urea is about __________ percent. |
| A. | 10 |
| B. | 46 |
| C. | 80 |
| D. | 94 |
| Answer» C. 80 | |
| 97. |
Reaction of __________ acid with phosphate rock produces superphosphates. |
| A. | hydrochloric |
| B. | sulphuric |
| C. | nitric |
| D. | phosphoric |
| Answer» C. nitric | |
| 98. |
Raw materials for urea production are |
| A. | CO2 and N2 |
| B. | CO2, H2 and N2 |
| C. | NH3 and CO |
| D. | HNO3 and CaCO3 |
| Answer» C. NH3 and CO | |
| 99. |
Which of the following fertilisers is required for the development of fibrous materials of the plants and of the sugar of vegetable & fruits ? |
| A. | Nitrogenous fertilisers |
| B. | Phosphatic fertilisers |
| C. | Potassic fertiliser |
| D. | None of these |
| Answer» D. None of these | |
| 100. |
Which nutrient in fertiliser makes the plant stems stronger and increases branching ? |
| A. | Nitrogen |
| B. | Phosphorous |
| C. | Potassium |
| D. | Calcium |
| Answer» C. Potassium | |