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. High cost
- B. All A, B. and C.
- C. Easy poisoning tendency
- D. Fragile nature
Explanation: Platinum was effective in the contact process but was costly, mechanically fragile, and readily poisoned by impurities such as arsenic…
Correct answer: All A, B. and C.- A. Reduced softening capacity of zeolite
- B. Easy removal of its hardness
- C. Increased dosage of chlorine to provide a disinfecting residual in the water
- D. None of these
Explanation: Hydrogen sulfide consumes chlorine through oxidation reactions, creating additional chlorine demand before a disinfecting residual can…
Correct answer: Increased dosage of chlorine to provide a disinfecting residual in the water- A. Quartz
- B. Chalcopyrite
- C. Siderite
- D. Galena
Explanation: Galena is lead sulfide, PbS, and is the principal ore of lead. Siderite is an iron carbonate, while chalcopyrite is a copper-iron sulfide.
Correct answer: Galena- A. Iron-steam reaction
- B. Electrolysis of water
- C. Steam reforming of naphtha
- D. Its cryogenic separation from coke oven gas
Explanation: The iron-steam reaction is mainly an older laboratory or limited-process route and is not a normal commercial source of hydrogen for…
Correct answer: Iron-steam reaction2285. The most commonly used substance to speed up the sedimentation of sewage is___________________?
- A. Lime
- B. Sulphuric acid
- C. Chlorine
- D. Sodium bisulphite
Explanation: Lime promotes coagulation and aggregation of suspended sewage solids, making them settle more rapidly during sedimentation.
Correct answer: Lime- A. Magnesium & potassium compounds
- B. Iodine
- C. Bromine
- D. Common salt
Explanation: Common salt, bromine, and magnesium compounds are recovered commercially from seawater or concentrated brines.
Correct answer: Iodine- A. SO2
- B. H2SO4
- C. SO3
- D. SO2 + H2SO4
Explanation: Oleum is sulfuric acid containing dissolved sulfur trioxide, so it releases SO3 fumes when exposed to air.
Correct answer: SO3- A. All A, B. and C.
- B. Sintering of porous catalyst
- C. Hydrogen embrittlement
- D. Pyrolysis of oil
Explanation: Excessive temperature during oil hydrogenation can cause oil pyrolysis, damage or sinter the porous catalyst, and promote hydrogen-related…
Correct answer: All A, B. and C.- A. Decoloration
- B. Hydrogenation
- C. Oxidation
- D. Purification
Explanation: Rancidity is promoted by oxidation of unsaturated fatty acids. Hydrogenation reduces unsaturation and makes the oil less susceptible to…
Correct answer: Hydrogenation- A. Prevent deterioration on storage
- B. Produce long fibres
- C. Remove lignin
- D. None of these
Explanation: Digestion cooks wood chips with chemicals that dissolve and separate lignin from the cellulose fibres.
Correct answer: Remove lignin- A. Is an anaesthetic
- B. Is used as a pain reliever
- C. Is an antimalarial
- D. Inhibits/destroys the growth of microorganisms
Explanation: An antibiotic is a substance that inhibits the growth of microorganisms or destroys them, especially susceptible bacteria.
Correct answer: Inhibits/destroys the growth of microorganisms- A. Na2SO4
- B. CaSO4
- C. MgSO4
- D. BaSO4
Explanation: Salt cake is the industrial name for sodium sulfate, Na2SO4, commonly produced as a by-product in the hydrochloric acid process.
Correct answer: Na2SO4- A. Sodium sulphite & sodium carbonate
- B. Sodium sulphide & sodium carbonate
- C. Sodium sulphite & sodium sulphide
- D. None of these
Explanation: Kraft white liquor is principally sodium hydroxide and sodium sulfide, with sodium carbonate commonly present as a minor component.
Correct answer: Sodium sulphide & sodium carbonate- A. Zinc
- B. Copper
- C. Platinum
- D. Nickel
Explanation: Nickel catalyses the hydrogenation of unsaturated vegetable oils, converting them into the semi-solid fat used for Vanaspati ghee.
Correct answer: Nickel- A. Sulphuric acid
- B. Nitric acid
- C. Ammonium sulphate
- D. Hydrochloric acid
Explanation: The DCDA process is an improved contact process for sulphuric acid manufacture.
Correct answer: Sulphuric acid- A. Galena
- B. Hematite
- C. Chalcopyrite
- D. Bauxite
Explanation: Hematite, Fe₂O₃, is a major iron ore. Galena is a lead ore, chalcopyrite is a copper ore, and bauxite is the principal ore of aluminium.
Correct answer: Hematite- A. Hydrolysis
- B. Oxidation
- C. Hydrogenation
- D. Hydrocracking
Explanation: Vanaspati is produced by hydrogenating edible vegetable oils, adding hydrogen across carbon-carbon double bonds and increasing the fat's…
Correct answer: Hydrogenation- A. Calcium sulphate
- B. Potassium sulphate
- C. Potassium chlorate
- D. None of these
Explanation: Glauber's salt is sodium sulphate decahydrate, Na₂SO₄·10H₂O. Since none of the listed options is a sodium sulphate compound, option d is…
Correct answer: None of these- A. Silica/quartz
- B. Lime powder
- C. Coke breeze
- D. Dolomite
Explanation: Silica or quartz acts as an acidic flux in copper smelting by combining with iron oxide impurities to form a fusible iron silicate slag.
Correct answer: Silica/quartz- A. Thermosetting
- B. Thermoplastic
- C. Fibrous
- D. Chemically active
Explanation: PVC softens on heating and can be repeatedly moulded, making it a thermoplastic polymer.
Correct answer: Thermoplastic