All Free Chemical Engineering MCQs with Answers
Every Chemical Engineering question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
6,983 questions · page 128 of 350
- A. Metals
- B. Refractories
- C. Alloys
- D. Non-metals
Explanation: In the conventional classification used for electroplating, refractory materials are not directly suitable as cathodes because they are…
Correct answer: Refractories- A. Calcium chloride
- B. Potassium sulphate
- C. Sodium sulphate
- D. Calcium sulphate
Explanation: Gypsum is calcium sulphate dihydrate, CaSO₄·2H₂O. Calcium chloride is a different calcium salt, while the other options are sulphates of…
Correct answer: Calcium sulphate- A. An explosive
- B. Used in glycerine manufacture
- C. Used in dye manufacture
- D. None of these
Explanation: Trinitrotoluene, or TNT, is an aromatic nitro compound used as a high explosive.
Correct answer: An explosive- A. Chlorine
- B. Ferric sulphate
- C. Calcium sulphate
- D. Activated carbon
Explanation: Ferric sulphate destabilizes suspended colloidal particles by neutralizing their charges, allowing them to form removable flocs.
Correct answer: Ferric sulphate- A. Jena
- B. Crookes
- C. Flint
- D. Pyrex
Explanation: Flint glass is traditionally used for electric bulbs because it is clear, readily fusible, and suitable for forming bulb envelopes.
Correct answer: Flint2546. Hollander beater used during paper pulp manufacture does not facilitate the ______________ of fiber?
- A. Cutting
- B. Fibrillation
- C. Hydration
- D. Strengthening
Explanation: A Hollander beater cuts fibers, fibrillates their surfaces, and hydrates them to improve bonding in paper.
Correct answer: Strengthening- A. Used for paper making
- B. Used as a cattle feed
- C. Highly acidic in nature
- D. None of these
Explanation: Massecuite is the mixture of sugar crystals and mother liquor produced during sugar crystallization.
Correct answer: None of these- A. Is prone to thermal decomposition
- B. Is soluble in ammonium chloride and potassium chloride solution
- C. Has high water solubility and is unstable
- D. All A , B. and C.
Explanation: The Solvay process depends on precipitating a sparingly soluble bicarbonate, but potassium bicarbonate remains soluble in the ammonium…
Correct answer: Is soluble in ammonium chloride and potassium chloride solution- A. Water
- B. Liquid ammonia
- C. Kerosene oil
- D. Alcohol
Explanation: Potassium reacts vigorously with water and can react with alcohol, so it is stored and transported under kerosene oil.
Correct answer: Kerosene oil- A. Hydrogenation
- B. Esterification
- C. None of these
- D. Saponification
Explanation: Saponification is the alkaline hydrolysis of fats or oils, producing glycerol and the alkali-metal salts of fatty acids, which are soaps.
Correct answer: Saponification- A. Same as thermosetting phenol-formaldehyde
- B. An inorganic polymer
- C. Same as Polytetrafluoroethylene (PTFE)
- D. Not a polymer
Explanation: Bakelite is the cross-linked thermosetting resin formed from phenol and formaldehyde.
Correct answer: Same as thermosetting phenol-formaldehyde- A. Fluorine
- B. Iodine
- C. Bromine
- D. Chlorine
Explanation: Seaweeds concentrate iodine from seawater, making them a traditional industrial source of iodine.
Correct answer: Iodine- A. Anaesthetics
- B. Analgesic drug
- C. Vitamin
- D. Anti-malarial drug
Explanation: Riboflavin is vitamin B2, a water-soluble vitamin involved in cellular energy metabolism.
Correct answer: Vitamin- A. CH4, & CO
- B. CO, & CO2
- C. H2, & CO
- D. H2, & CH4
Explanation: Coke-oven gas is produced during destructive distillation of coal and contains mainly hydrogen and methane, with smaller amounts of carbon…
Correct answer: H2, & CH42555. Carbon content of pitch (residue of coal tar distillation) is around ________________ percent?
- A. 70
- B. 55
- C. 80
- D. 94
Explanation: Coal-tar pitch is the carbon-rich residue left after distillation, with carbon content commonly taken as about 94 percent.
Correct answer: 94- A. Penicillin
- B. Wine
- C. Antibiotics
- D. Pasteurised milk
Explanation: Yeast ferments sugars anaerobically to produce ethanol and carbon dioxide, which is the essential step in wine manufacture.
Correct answer: Wine- A. Platinum
- B. Bromine
- C. Sulphur
- D. Alumina
Explanation: Sulphur is the conventional vulcanising agent for most general-purpose rubbers, forming cross-links between polymer chains on heating.
Correct answer: Sulphur- A. Emit poisonous vapour
- B. Kill insects following external bodily contact
- C. Are stomach poisons
- D. Are absorbed throughout the plant
Explanation: Systemic insecticides are taken up by a plant and transported through its tissues, so insects feeding on or contacting the treated plant…
Correct answer: Are absorbed throughout the plant- A. Ethyl magnesium chloride
- B. Sodium thiosulphate
- C. Sodium sulphite
- D. Sodium bicarbonate
Explanation: A Grignard reagent has the general formula RMgX, an organomagnesium halide; ethyl magnesium chloride, C2H5MgCl, is an example.
Correct answer: Ethyl magnesium chloride2560. Percentage of uranium in Carnotite ore found in Jadugoda (Jharkhand) is about ___________________?
- A. 1 to 5
- B. 0.1 to 0.5
- C. 5 to 10
- D. 15 to 25
Explanation: Carnotite is a low-grade uranium ore, and the uranium content of deposits such as those at Jaduguda is approximately 0.1 to 0.5 percent.
Correct answer: 0.1 to 0.5