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.
| 101. |
Phosphatic fertiliser is graded based on its __________ content. |
| A. | P2O3 |
| B. | PCl5 |
| C. | P2O5 |
| D. | H3PO4 |
| Answer» D. H3PO4 | |
| 102. |
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. | |
| 103. |
In an ammonia plant, the purge off is essential to |
| A. | maintain inert gas concentration within a limit. |
| B. | remove excess poisonous gases. |
| C. | maintain H2 : N2 ratio at 3 :1. |
| D. | remove uncondensed ammonia vapour. |
| Answer» D. remove uncondensed ammonia vapour. | |
| 104. |
Which of the following fertilisers is used as a cattle feed? |
| A. | Urea |
| B. | Calcium ammonium nitrate |
| C. | Superphosphate |
| D. | Ammonium sulphate |
| Answer» B. Calcium ammonium nitrate | |
| 105. |
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. | |
| 106. |
The most suitable fertiliser for accelerating seeding or fruit formation in later stages of plant growth is __________ fertiliser. |
| A. | nitrogenous |
| B. | phosphatic |
| C. | potassic |
| D. | none of these |
| Answer» C. potassic | |
| 107. |
Reaction of phosphate rock with 98% H2SO4 produces |
| A. | orthophosphoric acid |
| B. | superphosphate |
| C. | white phosphorous |
| D. | none of these |
| Answer» B. superphosphate | |
| 108. |
Nitro-phosphate (manufactured at Trom-bay) is a __________ fertiliser. |
| A. | mixed |
| B. | complex |
| C. | highly hygroscopic |
| D. | highly explosive |
| Answer» C. highly hygroscopic | |
| 109. |
Potassic fertilisers do not promote the development of |
| A. | stems & leaves during early stage of plant growth. |
| B. | starches of potatoes & grains. |
| C. | sugar of fruits & vegetables. |
| D. | fibrous materials of plants. |
| Answer» B. starches of potatoes & grains. | |
| 110. |
pH value of soil is maintained at __________ by the addition of fertiliser for optimum growth and health of the plant. |
| A. | 43589 |
| B. | 43684 |
| C. | 43747 |
| D. | 41609 |
| Answer» C. 43747 | |
| 111. |
Formation of ammonium carbamate by reaction of NH3 with CO2 is a/an __________ reaction. |
| A. | catalytic |
| B. | exothermic |
| C. | endothermic |
| D. | reversible |
| Answer» C. endothermic | |
| 112. |
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. | |
| 113. |
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 .H2O and CaSO4 crystals |
| B. | pyrophosphoric acid |
| C. | metaphosphoric acid |
| D. | all (a), (b) and (c). |
| Answer» B. pyrophosphoric acid | |
| 114. |
Chemical formula of biuret is |
| A. | NH2.CO.NH2 |
| B. | NH3.COO.NH3 |
| C. | NH2CONHCONH2 |
| D. | NH4COONH2 |
| Answer» D. NH4COONH2 | |
| 115. |
Steam reforming of naphtha produces ammonia synthesis gas. This is a/an __________ process. |
| A. | autocatalytic |
| B. | endothermic |
| C. | exothermic |
| D. | non-catalytic |
| Answer» C. exothermic | |
| 116. |
Which of the following set of conditions is favourable for the maximum yield of ammonia by Haber's process ? |
| A. | High pressure, low reactants concentration, high temperature. |
| B. | High pressure, low reactants concentration, low temperature. |
| C. | High pressure, high reactants concentration, low temperature. |
| D. | Low pressure, high reactants concentration, low temperature. |
| Answer» D. Low pressure, high reactants concentration, low temperature. | |
| 117. |
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. | |
| 118. |
Excessive use of chemical fertilisers causes shrivelling of the roots and wilting of the plant, because the |
| A. | osmotic pressure of the soil water becomes less than that of the plant sap. |
| B. | soil becomes too alkaline. |
| C. | osmotic pressure of the soil water becomes higher than that of the plant sap. |
| D. | soil becomes too acidic. |
| Answer» D. soil becomes too acidic. | |
| 119. |
Iron is not used alone as a catalyst in ammonia synthesis, because |
| A. | its activity declines rapidly, if heated to above 520°C. |
| B. | it decomposes ammonia. |
| C. | it gets oxidised above 500°C. |
| D. | none of these. |
| Answer» B. it decomposes ammonia. | |
| 120. |
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. | |
| 121. |
Both white phosphorous as well as red phosphorous |
| A. | are soluble in CS2. |
| B. | burns when heated in air. |
| C. | reacts with hot caustic soda solution to give phosphine. |
| D. | all (a), (b), and (c). |
| Answer» C. reacts with hot caustic soda solution to give phosphine. | |
| 122. |
Ammonium nitrate (is mixed with limestone) is not used as fertiliser as such, because |
| A. | it is hygroscopic and explosive in nature. |
| B. | it is highly acidic in nature. |
| C. | it is a liquid at room temperature. |
| D. | its nitrogen content is very less. |
| Answer» B. it is highly acidic in nature. | |
| 123. |
The essential ingradient of all the synthesis gas is |
| A. | H2 |
| B. | O2 |
| C. | CO2 |
| D. | N2 |
| Answer» B. O2 | |
| 124. |
NPK means a __________ fertiliser. |
| A. | mixed |
| B. | potassic |
| C. | liquid |
| D. | solid |
| Answer» B. potassic | |
| 125. |
Dehydration of ammonium carbamate to yield urea is a/an __________ reaction. |
| A. | exothermic |
| B. | endothermic |
| C. | autocatalytic |
| D. | catalytic |
| Answer» C. autocatalytic | |
| 126. |
P2O5 percentage in the phosphoric acid produced by wet process is about |
| A. | 10 |
| B. | 30 |
| C. | 50 |
| D. | 70 |
| Answer» C. 50 | |
| 127. |
Ammonia synthesis reaction is |
| A. | exothermic |
| B. | endothermic |
| C. | autocatalytic |
| D. | none of these |
| Answer» B. endothermic | |
| 128. |
__________ is the most suitable fertiliser for paddy. |
| A. | Urea |
| B. | Ammonium sulphate |
| C. | Superphosphate |
| D. | Potassium nitrate |
| Answer» C. Superphosphate | |
| 129. |
Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of __________ this is normally not done. |
| A. | increased biuret formation |
| B. | high corrosion rate |
| C. | increased cost of equipment |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 130. |
Rock phosphate constitutes mainly of |
| A. | fluorapatite |
| B. | di-calcium phosphate |
| C. | mono-calcium phosphate |
| D. | di-ammonium phosphate |
| Answer» B. di-calcium phosphate | |
| 131. |
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 | |
| 132. |
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. | |
| 133. |
The optimum size of the ammonia plant is __________ tons/day. |
| A. | 10 |
| B. | 100 |
| C. | 1000 |
| D. | 1000C. |
| Answer» D. 1000C. | |
| 134. |
__________ is the undesirable by-product produced in the manufacture of urea. |
| A. | Ammonium carbonate |
| B. | Biuret |
| C. | Carbon dioxide |
| D. | Ammonium carbamate |
| Answer» C. Carbon dioxide | |
| 135. |
Naphtha in a fertiliser plant is used as a source of |
| A. | fuel |
| B. | H2 |
| C. | N2 |
| D. | O2 |
| Answer» C. N2 | |
| 136. |
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. | |
| 137. |
Low grade coal is __________ to produce ammonia synthesis gas. |
| A. | hydrogenated |
| B. | liquefied |
| C. | gasified |
| D. | dehydrogenated |
| Answer» D. dehydrogenated | |
| 138. |
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 | |
| 139. |
Which of the following fertilisers is needed for promoting the development of leaves and stems during early stages of plant growth ? |
| A. | Nitrogeneous fertiliser |
| B. | Potassic fertiliser |
| C. | Phosphatic fertiliser |
| D. | None of these |
| Answer» B. Potassic fertiliser | |
| 140. |
Reaction of orthophosphoric acid with phosphate rock produces |
| A. | superphosphate |
| B. | triple superphosphate |
| C. | metaphosphoric acid |
| D. | monoammonium phosphate |
| Answer» C. metaphosphoric acid | |
| 141. |
Heating a mixture of phosphate rock, coke and sand in an electric furnace produces |
| A. | phosphoric acid |
| B. | ammonium phosphate |
| C. | phosphorous |
| D. | superphosphate |
| Answer» D. superphosphate | |
| 142. |
In __________ converter for ammonia synthesis, the catalyst is arranged in the form of a single continuous bed. |
| A. | Fauser-Monte Catini |
| B. | Claude |
| C. | Udhe |
| D. | Kellog |
| Answer» C. Udhe | |
| 143. |
Ammonia synthesis gas is produced from fuel oil by |
| A. | steam reforming |
| B. | hydrocracking |
| C. | partial oxidation |
| D. | hydrogenation |
| Answer» D. hydrogenation | |
| 144. |
With increases in pressure, the conversion of ammonium carbamate into urea |
| A. | increases |
| B. | decreases |
| C. | remains unaltered |
| D. | can either increase or decrease depends on biuret content |
| Answer» B. decreases | |
| 145. |
Sodium tri poly phosphate (STPP) is chemically represented as |
| A. | Na5P3O10 |
| B. | Na4P3O8 |
| C. | Na3P4O6 |
| D. | Na2PO4 |
| Answer» B. Na4P3O8 | |
| 146. |
P2O5 content in superphosphate is about __________ percent. |
| A. | 30-35 |
| B. | 15-20 |
| C. | 65-70 |
| D. | 85-90 |
| Answer» C. 65-70 | |
| 147. |
Raw materials for nitric acid manufacture are |
| A. | hydrogen peroxide, air and water. |
| B. | anhydrous ammonia and air. |
| C. | anhydrous ammonia, air and water. |
| D. | wet ammonia, air and water. |
| Answer» D. wet ammonia, air and water. | |
| 148. |
Which is the best fertiliser for paddy ? |
| A. | Ammonium sulphate |
| B. | Nitro-phosphate |
| C. | Superphosphate |
| D. | Potassium nitrate |
| Answer» B. Nitro-phosphate | |
| 149. |
H4P2O7 is the chemical formula of __________ phosphoric acid. |
| A. | pyro |
| B. | ortho |
| C. | meta |
| D. | none of these |
| Answer» B. ortho | |
| 150. |
Plant tranquillisers |
| A. | hold back stem growth and halt plants at a desired height. |
| B. | cause early maturation of plants. |
| C. | accelerate ripening of food and grain. |
| D. | produce seedless fruit. |
| Answer» B. cause early maturation of plants. | |