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.
| 251. |
Heating of coke, sand & phosphate rock in an electric furnace is done for the manufacture of |
| A. | phosphoric acid. |
| B. | superphosphate. |
| C. | phosphorous. |
| D. | triple superphosphate. |
| Answer» D. triple superphosphate. | |
| 252. |
Which of the following does not come under the category of'primary nutrient' for plant growth? |
| A. | Potassium |
| B. | Nitrogen |
| C. | Phosphorous |
| D. | Sulphur |
| Answer» E. | |
| 253. |
Base suspension fertiliser essentially contains |
| A. | 13% N2 and 43% P2O5 |
| B. | 43% N2 and 13% P2O5 |
| C. | 43% N2 and 13% K2O |
| D. | 43% K2O and 43% P2O5 |
| Answer» B. 43% N2 and 13% P2O5 | |
| 254. |
A mixture of phosphate rock __________ is heated in an electric furnace to produce phosphorous. |
| A. | salt & coke |
| B. | sand & coke |
| C. | and coke |
| D. | and sand |
| Answer» C. and coke | |
| 255. |
Maximum stability of white phosphorous is at |
| A. | very high pressure |
| B. | atmospheric pressure |
| C. | room temperature |
| D. | >600°C |
| Answer» E. | |
| 256. |
Catalyst used in Haber's process for ammonia production is |
| A. | reduced iron oxide |
| B. | nickel |
| C. | vanadium pentoxide |
| D. | silica gel |
| Answer» B. nickel | |
| 257. |
__________ catalyst is used in the production of urea from CO2 and NH3. |
| A. | Vanadium pentoxide |
| B. | No |
| C. | Alumina |
| D. | Nickel |
| Answer» C. Alumina | |
| 258. |
In the manufacture of urea, the intermediate chemical formed is |
| A. | biuret |
| B. | ammonium carbamate |
| C. | ammonium carbonate |
| D. | none of these |
| Answer» C. ammonium carbonate | |
| 259. |
In calcium ammonium nitrate (CAN) fertil-ser |
| A. | nitrate nitrogen is quick acting |
| B. | ammoniacal nitrogen is quick acting |
| C. | nitrate nitrogen is slower acting |
| D. | none of these |
| Answer» B. ammoniacal nitrogen is quick acting | |
| 260. |
Ammonium phosphate is a __________ fertiliser. |
| A. | nitrogenous |
| B. | phosphatic |
| C. | complex |
| D. | mixed |
| Answer» E. | |
| 261. |
Phosphatic fertilisers |
| A. | are useful during early stage of the plant growth. |
| B. | accelerate fruit formation in later stages of growth. |
| C. | lessen the effect of excessive nitrogen application. |
| D. | none of these |
| Answer» C. lessen the effect of excessive nitrogen application. | |
| 262. |
Catalytic ammonia synthesis reaction as in Haber's process is |
| A. | endothermic |
| B. | exothermic |
| C. | irreversible |
| D. | none of these |
| Answer» C. irreversible | |
| 263. |
Reaction of cresylic acid with __________ produces tricresyl phosphate. |
| A. | phosphorous pentoxide |
| B. | phosphorous oxychloride |
| C. | ammonium phosphate |
| D. | calcium phosphate |
| Answer» C. ammonium phosphate | |
| 264. |
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 | |
| 265. |
Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction. |
| A. | reversible |
| B. | catalytic |
| C. | exothermic |
| D. | endothermic |
| Answer» E. | |
| 266. |
Ammonium nitrate (a fertiliser) is coated with limestone powder to |
| A. | increase its nitrogen content. |
| B. | cut down its production cost. |
| C. | avoid the risk of explosion. |
| D. | add extra nutrient as fertiliser. |
| Answer» D. add extra nutrient as fertiliser. | |
| 267. |
Electric furnace method for production of phosphorous uses phosphate rock |
| A. | and phosphoric acid |
| B. | and coke |
| C. | and sulphuric acid |
| D. | silica and coke |
| Answer» E. | |
| 268. |
Catalyst used in steam reforming of naphtha is |
| A. | bauxite |
| B. | cobalt |
| C. | nickel oxide on alumina support |
| D. | chromium |
| Answer» D. chromium | |
| 269. |
Potassic fertilisers |
| A. | are useful during early stage of the plant growth. |
| B. | stimulate early growth and accelerate seeding. |
| C. | help in development of starches of potatoes and grain. |
| D. | none of these. |
| Answer» D. none of these. | |
| 270. |
Leaching of phosphate rock by strong __________ acid produces phosphoric acid. |
| A. | sulphuric |
| B. | hydrochloric |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 271. |
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 | |
| 272. |
H3PO4 is the chemical formula of __________ phosphoric acid. |
| A. | pyro |
| B. | ortho |
| C. | meta |
| D. | none of these |
| Answer» C. meta | |
| 273. |
Commercial fertilisers are available mostly in the form of |
| A. | powder |
| B. | grannules |
| C. | lumps |
| D. | flakes |
| Answer» C. lumps | |
| 274. |
Reaction of anhydrous liquid ammonia with orthophosphoric acid produces |
| A. | ammonium phosphate |
| B. | superphosphate |
| C. | triple superphosphate |
| D. | none of these |
| Answer» B. superphosphate | |
| 275. |
Ammonium sulphate fertiliser is |
| A. | the highest concentration nitrogenous fertiliser. |
| B. | the best fertiliser for paddy. |
| C. | a basic fertiliser. |
| D. | a neutral fertiliser. |
| Answer» C. a basic fertiliser. | |
| 276. |
Ammonium nitrate is |
| A. | having about 40% N2. |
| B. | not hygroscopic. |
| C. | not prone to explosive thermal decomposition. |
| D. | mixed with limestone powder to reduce its explosive nature before using it as a fertilizer. |
| Answer» E. | |
| 277. |
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 | |
| 278. |
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 | |
| 279. |
Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils ? |
| A. | Urea |
| B. | CAN |
| C. | Ammonium sulphate |
| D. | Calcium cyanamide |
| Answer» E. | |
| 280. |
The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about __________ percent. |
| A. | 60 |
| B. | 30 |
| C. | 95 |
| D. | 100 |
| Answer» B. 30 | |
| 281. |
Prilling tower is found in the flowsheet for the manufacture of |
| A. | ammonia |
| B. | urea |
| C. | superphosphate |
| D. | triple superphosphate |
| Answer» C. superphosphate | |
| 282. |
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. | |
| 283. |
Reaction of dilute sulphuric acid with phosphate rock produces |
| A. | phosphoric acid |
| B. | superphosphate |
| C. | triple superphosphate |
| D. | gypsum |
| Answer» B. superphosphate | |
| 284. |
P2O5 content in triple superphosphate is about __________ percent. |
| A. | 42-50 |
| B. | 15-20 |
| C. | 85-90 |
| D. | 70-75 |
| Answer» B. 15-20 | |
| 285. |
Ammonium sulphate can be produced by reacting gypsum with |
| A. | ammonia |
| B. | ammonium carbonate |
| C. | nitric acid |
| D. | none of these |
| Answer» C. nitric acid | |
| 286. |
During conversion of ammonium carbamate into urea, presence of large excess of water |
| A. | increases the yield of urea. |
| B. | adversely affects the yield of urea. |
| C. | reduces the evaporator load by diluting the urea solution. |
| D. | does not affect the yield of urea. |
| Answer» C. reduces the evaporator load by diluting the urea solution. | |
| 287. |
Ammonia synthesis gas is produced from natural gas by |
| A. | thermal cracking |
| B. | steam reforming |
| C. | partial oxidation |
| D. | hydrogenation |
| Answer» C. partial oxidation | |
| 288. |
Phosphorus vapour comprises of |
| A. | P |
| B. | P2 |
| C. | P3 |
| D. | P4 |
| Answer» E. | |