Free Chemical Process Principles MCQs with Answers
2,710 Chemical Process Principles MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Excess liquid ammonia and liquefied CO2
- B. Liquid ammonia and excess compressed CO2
- C. Excess liquid ammonia and compressed CO2 gas
- D. Compressed ammonia gas and excess compressed CO2
Explanation: Urea synthesis is fed with excess liquid ammonia and compressed carbon dioxide gas at high pressure.
Correct answer: Excess liquid ammonia and compressed CO2 gas- A. KCl
- B. K2SO4
- C. KNO3
- D. K2O
Explanation: Potassic fertilisers are conventionally graded by their equivalent K2O content, even though the potassium may actually be present as KCl…
Correct answer: K2O363. Fertiliser produced during soda ash manufacture by dual process is ammonium______________________?
- A. Chloride
- B. Sulphate
- C. Nitrate
- D. None of these
Explanation: The Solvay dual process recovers ammonia by reacting ammonium chloride with lime, leaving ammonium chloride as the associated fertiliser…
Correct answer: Chloride- A. Di-calcium phosphate
- B. Fluorapatite
- C. Mono-calcium phosphate
- D. Di-ammonium phosphate
Explanation: Natural phosphate rock consists mainly of apatite minerals, especially fluorapatite, represented approximately by Ca10(PO4)6F2.
Correct answer: Fluorapatite- A. It gets oxidised above 500°C
- B. It decomposes ammonia
- C. Its activity declines rapidly, if heated to above 520°C
- D. None of these
Explanation: Unpromoted iron loses catalytic activity rapidly when heated above roughly 520°C because of sintering and loss of active surface.
Correct answer: Its activity declines rapidly, if heated to above 520°C- A. Concentrated HCl
- B. Concentrated H2SO4
- C. Concentrated NHO3
- D. Dilute H2SO4
Explanation: In the wet process, phosphate rock is digested with sulfuric acid in an aqueous slurry, conventionally described as using dilute H2SO4.
Correct answer: Dilute H2SO4- A. Ammonium sulphate
- B. Ammonium nitrate
- C. Urea
- D. Ammonium chloride
Explanation: Ammonium sulphate contains about 21% nitrogen, compared with roughly 26% in ammonium chloride, 35% in ammonium nitrate and 46% in urea.
Correct answer: Ammonium sulphate- A. Ammonia
- B. Nitric acid
- C. Ammonium carbonate
- D. None of these
Explanation: Ammonium carbonate reacts with gypsum to form ammonium sulphate and precipitated calcium carbonate: gypsum + ammonium carbonate → ammonium…
Correct answer: Ammonium carbonate- A. Solid
- B. Potassic
- C. Liquid
- D. Mixed
Explanation: NPK denotes a fertiliser supplying nitrogen, phosphorus and potassium, generally made as a mixed or compound fertiliser.
Correct answer: Mixed- A. Urea
- B. Biuret
- C. Ammonia water
- D. None of these
Explanation: Ammonium carbamate loses water during dehydration to form urea: NH2COONH4 → NH2CONH2 + H2O.
Correct answer: Urea- A. 30-35
- B. 15-20
- C. 65-70
- D. 85-90
Explanation: Normal superphosphate typically contains about 16–20% available P2O5, so 15–20% is the matching range.
Correct answer: 15-20- A. Are useful during early stage of the plant growth
- B. Stimulate early growth and accelerate seeding
- C. None of these
- D. Help in development of starches of potatoes and grain
Explanation: Potassium helps plants form and transport carbohydrates, including starch, so it is especially associated with starch development in…
Correct answer: Help in development of starches of potatoes and grain- A. Ammonium sulphate
- B. CAN
- C. Ammonium nitrate
- D. Superphosphate
Explanation: Ammonium sulphate is well suited to paddy because it supplies ammonium nitrogen, which is retained effectively in flooded, reducing soil…
Correct answer: Ammonium sulphate- A. Coke oven
- B. Natural
- C. Producer
- D. Coal
Explanation: A gas-based fertiliser plant commonly uses natural gas as its hydrogen source, producing hydrogen by steam reforming of methane before…
Correct answer: Natural- A. Powder
- B. Flakes
- C. Lumps
- D. Granules
Explanation: Commercial fertilisers are generally granulated to improve flow, reduce dust, facilitate storage and permit uniform application.
Correct answer: Granules- 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
Explanation: Nitrogen is needed especially during early vegetative growth because it promotes chlorophyll formation, leaf development and stem growth.
Correct answer: During the early stage of growth to promote development of stem and leaves- A. 38
- B. 68
- C. 82
- D. 98
Explanation: With a platinum-rhodium catalyst, ammonia oxidation to nitric oxide is highly selective and typically achieves about 95 to 98% conversion.
Correct answer: 98- A. Tricresyl phosphate
- B. Triple superphosphate
- C. Fluorapatite
- D. Superphosphate
Explanation: The group CH3C6H4 is a cresyl group, and three such groups attached to phosphate give tricresyl phosphate, (CH3C6H4)3PO4.
Correct answer: Tricresyl phosphate- A. Pyro
- B. Ortho
- C. Meta
- D. None of these
Explanation: HPO3 is the empirical formula of metaphosphoric acid, formed by condensation of orthophosphoric acid with loss of water.
Correct answer: Meta- A. Hydrochloric
- B. Phosphoric
- C. Nitric
- D. Sulphuric
Explanation: Sulphuric acid reacts with phosphate rock to form ordinary superphosphate, mainly monocalcium phosphate mixed with gypsum.
Correct answer: Sulphuric