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. Citrus fruits
- B. Controlling poultry lice
- C. Potato beetle
- D. Controlling timber degradation by ants
Explanation: Hydrogen cyanide has been used as a fumigant against insect pests on citrus plants and fruits.
Correct answer: Citrus fruits- A. Corundum
- B. Viscose rayon
- C. Plasticiser for unsaturated polyester
- D. Paints
Explanation: Carbon disulphide reacts with cellulose to form cellulose xanthate, the intermediate used in manufacturing viscose rayon.
Correct answer: Viscose rayon- A. 5
- B. 70
- C. 500
- D. 1700
Explanation: Seawater contains bromide equivalent to roughly 65 to 70 ppm of bromine.
Correct answer: 70- A. Explosives
- B. Fertilisers
- C. Aqua regia
- D. Detergents
Explanation: Nitric acid is used in fertilisers, explosives and aqua regia, where it combines with hydrochloric acid.
Correct answer: Detergents- A. Cellulose nitrate
- B. Regenerated cellulose
- C. Cellulose acetate
- D. Cellulose acetate butyrate
Explanation: Celluloid is chiefly cellulose nitrate plasticised with substances such as camphor.
Correct answer: Cellulose nitrate2326. Which of the following impurities in feed water for high pressure boiler is the most detrimental ?
- A. Dissolved oxygen
- B. Silica
- C. Suspended salt
- D. Dissolved salt
Explanation: Silica is especially harmful in high-pressure boilers because it forms hard deposits and can be carried with steam to foul turbine blades.
Correct answer: Silica- A. None of these
- B. Flaming
- C. Doctor Zhivago
- D. Alexander
Explanation: Penicillin was discovered by Alexander Fleming in 1928 when he observed that a mould inhibited bacterial growth.
Correct answer: Alexander- A. Phenol formaldehyde
- B. Polythene
- C. Poly vinyl chloride
- D. None of these
Explanation: Phenol-formaldehyde is formed by condensation of phenol with formaldehyde, with elimination of water during polymer formation.
Correct answer: Phenol formaldehyde- A. Insecticides
- B. Fire retardant
- C. Analgesic drug
- D. Hydrogenation catalyst
Explanation: Chlorine liberates bromine from sodium bromide, and bromine-containing compounds are widely used as flame or fire retardants.
Correct answer: Fire retardant- A. Monosaccharide
- B. Polysaccharide
- C. Disaccharide
- D. None of these
Explanation: Sucrose is formed from one glucose unit and one fructose unit, so it is a disaccharide.
Correct answer: Disaccharide- A. Hardness
- B. Abrasion/resistance
- C. Melting point
- D. None of these
Explanation: Nylon-66 generally has greater hardness, stiffness, abrasion resistance and melting point than Nylon-6; Nylon-6 is noted more for…
Correct answer: None of these- A. (NH4)2SO4
- B. NH4Cl
- C. (NH4)2 NO3
- D. Liquid NH3
Explanation: Ammonia recovered from coke-oven gas is absorbed in sulfuric acid, producing ammonium sulfate: 2NH₃ + H₂SO₄ → (NH₄)₂SO₄.
Correct answer: (NH4)2SO4- A. 10
- B. 25
- C. 50
- D. 98
Explanation: The diaphragm cell produces relatively dilute caustic soda, typically about 10 to 12% NaOH, because the catholyte is diluted by water.
Correct answer: 10- A. 10
- B. 50
- C. 80
- D. 95
Explanation: Bamboo contains roughly 40 to 50% cellulose, making the approximate value 50% the suitable choice.
Correct answer: 50- A. Producer gas
- B. Water gas
- C. Coke oven gas
- D. All A., B. and C.
Explanation: CO and H₂ are the defining combustible components of water gas, and both can also occur in producer gas and coke-oven gas.
Correct answer: All A., B. and C.- A. Both A. and B.
- B. Obtained by treating by-products of the tobacco processing industry
- C. A volatile alkaloid
- D. Neither A. nor B.
Explanation: Nicotine is a volatile alkaloid characteristic of tobacco and is recovered during tobacco processing, including from its by-products.
Correct answer: Both A. and B.- A. Continuous
- B. Aerobic batch
- C. Anaerobic batch
- D. None of these
Explanation: Penicillin is produced by aerobic submerged fermentation in batch vessels, because the microorganism requires oxygen and the process is…
Correct answer: Aerobic batch- A. Presence of air
- B. Absence of air
- C. High concentration
- D. Presence of ammonium salts
Explanation: Excessively high substrate concentration can inhibit microorganisms through osmotic effects and can also hinder nutrient utilization…
Correct answer: High concentration- A. Dehydrated soda ash
- B. Dense soda ash
- C. Sodium bicarbonate
- D. Light soda ash
Explanation: Sodium bicarbonate is calcined in the Solvay process to form sodium carbonate, Na₂CO₃, called light soda ash.
Correct answer: Light soda ash- A. Methyl amine
- B. Naphthalene
- C. Phenol
- D. Xylene
Explanation: Naphthols are hydroxyl derivatives of naphthalene, formed by replacing a hydrogen atom on the naphthalene ring system with an OH group.
Correct answer: Naphthalene