MCQOPTIONS
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MCQOPTIONS
This section includes 38 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Catalyst used in the manufacture of NH3 by Haber\'s process is finely divided |
| A. | iron |
| B. | nickel |
| C. | alumina |
| D. | vanadium pentoxide |
| Answer» B. nickel | |
| 2. |
During nitric acid manufacture, catalytic oxidation of ammonia at 800°C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH 3 to NO is about __________ percent. |
| A. | 38 |
| B. | 68 |
| C. | 82 |
| D. | 98 |
| Answer» E. | |
| 3. |
P 2 O 5 content in superphosphate is about __________ percent. |
| A. | 30-35 |
| B. | 15-20 |
| C. | 65-70 |
| D. | 85-90 |
| Answer» C. 65-70 | |
| 4. |
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. | |
| 5. |
P 2 O 5 percentage in the phosphoric acid produced by wet process is about |
| A. | 10 |
| B. | 30 |
| C. | 50 |
| D. | 70 |
| Answer» C. 50 | |
| 6. |
An increase in the NH 3 /CO 2 ratio in urea manufacture results in |
| A. | increased degree of conversion of CO 2 to urea. |
| B. | decreased degree of conversion of NH 3 to urea. |
| C. | decreased yield of urea. |
| D. | decreased specific volume of molten mass. |
| Answer» B. decreased degree of conversion of NH 3 to urea. | |
| 7. |
Which of the following solvents is used for the extraction of H 3 PO 4 from CaCl 2 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 | |
| 8. |
Triple superphosphate which contains about 46% P 2 O 5 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 | |
| 9. |
In the manufacture of orthophosphoric acid by strong H 2 SO 4 leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesriable |
| A. | CaSO 4 . H 2 O and CaSO 4 crystals |
| B. | pyrophosphoric acid |
| C. | metaphosphoric acid |
| D. | all (a), (b) and (c). |
| Answer» B. pyrophosphoric acid | |
| 10. |
Out of the following, N 2 content is minimum in |
| A. | urea |
| B. | ammonium nitrate |
| C. | ammonium sulphate |
| D. | ammonium chloride |
| Answer» D. ammonium chloride | |
| 11. |
Raw materials required for the production of CAN (Calcium ammonium nitrate) is NH 3 |
| A. | HNO 3 & limestone |
| B. | CO 2 & H 2 SO 4 |
| C. | HNO 3 & NH 4 Cl |
| D. | CO 2 & KNO 3 |
| Answer» B. CO 2 & H 2 SO 4 | |
| 12. |
Conversion achieved in HNO 3 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. | |
| 13. |
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 | |
| 14. |
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. | |
| 15. |
CaH 4 (PO 4 ) 2 is the chemical formula of |
| A. | superphosphate |
| B. | triple superphosphate |
| C. | calcium phosphate |
| D. | meta phosphoric acid |
| Answer» C. calcium phosphate | |
| 16. |
A potassic fertiliser contains 50% K 2 O. It could be |
| A. | potassium sulphate. |
| B. | potassium chloride. |
| C. | a mixture of NaCl+ KCl. |
| D. | none of these. |
| Answer» B. potassium chloride. | |
| 17. |
Formation of ammonium carbamate by reaction of NH 3 with CO 2 is a/an __________ reaction. |
| A. | catalytic |
| B. | exothermic |
| C. | endothermic |
| D. | reversible |
| Answer» C. endothermic | |
| 18. |
Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at __________ °C. |
| A. | 250-300 |
| B. | 500-750 |
| C. | 950-1050 |
| D. | 1400-1450 |
| Answer» E. | |
| 19. |
A phosphatic fertiliser contains 16% P 2 O 5 . It could be |
| A. | dicalcium phosphate |
| B. | superphosphate |
| C. | triple superphosphate |
| D. | none of these |
| Answer» C. triple superphosphate | |
| 20. |
In the manufacture of H 3 PO 4 (ortho), ; strong H 2 SO 4 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. | |
| 21. |
A nitrogenous fertiliser contains 20% N 2 . It could be |
| A. | ammonium nitrate. |
| B. | calcium ammonium nitrate (CAN). |
| C. | urea. |
| D. | ammonium chloride. |
| Answer» C. urea. | |
| 22. |
In ammonia synthesis (N 2 + 3H 2 = 2NH 3 ), 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. | |
| 23. |
I argest capacity nitrogenous fertiliser plants (2700 tons of NH 3 per day) (2 Nos) in India are located at |
| A. | Thal-Vaishet (under RCF in Maharashtra) and Hazira (under IFFCO in Gujarat). |
| B. | Talchar (Orissa) and Ramagundam (A.P.) both under FCI. |
| C. | Korba (M.P.) and Talchar (Orissa) both under FCI. |
| D. | Haldia (W.B) and Namrup (Assam) both under HFC. |
| Answer» B. Talchar (Orissa) and Ramagundam (A.P.) both under FCI. | |
| 24. |
H 4 P 2 O 7 is the chemical formula of __________ phosphoric acid. |
| A. | pyro |
| B. | ortho |
| C. | meta |
| D. | none of these |
| Answer» B. ortho | |
| 25. |
HPO 3 is the chemical formula of __________ phosphoric acid. |
| A. | pyro |
| B. | ortho |
| C. | meta |
| D. | none of these |
| Answer» D. none of these | |
| 26. |
Reaction of phosphate rock with 98% H 2 SO 4 produces |
| A. | orthophosphoric acid |
| B. | superphosphate |
| C. | white phosphorous |
| D. | none of these |
| Answer» B. superphosphate | |
| 27. |
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 | |
| 28. |
A fertiliser contains 82% N 2 . It could be |
| A. | urea |
| B. | liquid NH 3 |
| C. | ammonium nitrate |
| D. | none of these |
| Answer» C. ammonium nitrate | |
| 29. |
Multistage operation (as in the case of catalytic oxidation of SO 2 ) is not carried out for NH 3 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. | |
| 30. |
Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N 2 & H 2 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 |
| Answer» E. | |
| 31. |
Heating of orthophosphoric acid to 250°C produces |
| A. | metaphosphoric acid |
| B. | pyrophosphoric acid |
| C. | no change in it |
| D. | none of these |
| Answer» C. no change in it | |
| 32. |
H 3 PO 4 is the chemical formula of __________ phosphoric acid. |
| A. | pyro |
| B. | ortho |
| C. | meta |
| D. | none of these |
| Answer» C. meta | |
| 33. |
P 2 O 5 content in triple superphosphate is about __________ percent. |
| A. | 42-50 |
| B. | 15-20 |
| C. | 85-90 |
| D. | 70-75 |
| Answer» B. 15-20 | |
| 34. |
CO 2 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 | |
| 35. |
(CH 3 C 6 H 4 ) 3 PO 4 is the chemical formula of |
| A. | triple superphosphate |
| B. | tricresyl phosphate |
| C. | flourapatite |
| D. | superphosphate |
| Answer» C. flourapatite | |
| 36. |
Fertiliser plants get their N 2 requirements |
| A. | by fractionation of liquified air. |
| B. | by dissociating oxides of nitrogen. |
| C. | from coal gas (coke oven gas). |
| D. | from producer gas. |
| Answer» B. by dissociating oxides of nitrogen. | |
| 37. |
Catalyst used in the manufacture of NH 3 by Haber's process is finely divided |
| A. | nickel |
| B. | iron |
| C. | vanadium pentoxide |
| D. | alumina |
| Answer» C. vanadium pentoxide | |
| 38. |
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 |
| Answer» C. 1000-1200 | |