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.
Last updated
2,710 questions · page 111 of 136
- A. Detergent
- B. Soap
- C. Oil hydrogenation
- D. Paint
Explanation: Soap manufacture by saponification of fats or oils produces glycerine along with soap.
Correct answer: Soap- A. Calcium perchlorate
- B. Soda lime
- C. Slaked lime
- D. None of these
Explanation: Bleaching powder is made by passing chlorine over dry slaked lime, Ca(OH)2, producing calcium hypochlorite-containing material.
Correct answer: Slaked lime- A. Do not contain pigment
- B. Are same as varnish
- C. Are prepared from non-drying oil
- D. Give good glossy finish
Explanation: Enamels are pigmented coating materials that dry to form a hard, smooth and glossy finish.
Correct answer: Give good glossy finish- A. All A , B, and C.
- B. Treating it with zeolites
- C. Passing it through sodium hexametaphosphate
- D. Addition of soda ash to it
Explanation: Soda ash precipitates calcium and magnesium carbonates, zeolites exchange hardness ions for sodium, and sodium hexametaphosphate…
Correct answer: All A , B, and C.- A. Hypo
- B. Bleaching powder
- C. Plaster of Paris
- D. Aqua regia
Explanation: CaCl(OCl) contains calcium combined with chloride and hypochlorite ions and represents bleaching powder, commonly written approximately as…
Correct answer: Bleaching powder- A. Have an isoparaffinic structure
- B. Pose problem in sewerage plant
- C. Can be readily oxidised
- D. Should not be used as it spoils the cloth
Explanation: Biodegradable detergents are readily attacked and oxidised by microorganisms, so they break down in the environment.
Correct answer: Can be readily oxidised2207. Laboratory glass wares which reacts with hydrofluoric acid, are made of the ______________ glass?
- A. Lead
- B. Alkali silicate
- C. Soda lime
- D. Borosilicate
Explanation: Laboratory glassware is commonly made from borosilicate glass, whose silica network is attacked by hydrofluoric acid.
Correct answer: Borosilicate- A. Perspex
- B. Teflon
- C. Bakelite
- D. Nylon-6
Explanation: PMMA is the transparent acrylic plastic sold under the trade name Perspex.
Correct answer: Perspex- A. Accelerate the oxidation of oil
- B. Suspend pigments & dissolve film forming materials
- C. Prevent gelling of the paint
- D. Form a protective film
Explanation: A thinner lowers paint viscosity and helps dissolve or disperse the film-forming binder so the paint can be applied smoothly.
Correct answer: Suspend pigments & dissolve film forming materials- A. Sodium
- B. Potassium
- C. Aluminium or calcium
- D. Both sodium & potassium
Explanation: Metallic soaps are generally salts of fatty acids with multivalent or heavy metals such as aluminium and calcium.
Correct answer: Aluminium or calcium- A. Diethyl-diphenyl-trichloromethane
- B. Dichloro-diphenyl-trichloromethane
- C. diphenyl-dichloro-trichloromethane
- D. Dichloro-diphenyl-trichloroethane
Explanation: DDT expands to dichloro-diphenyl-trichloroethane, more precisely 1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane.
Correct answer: Dichloro-diphenyl-trichloroethane- A. 5
- B. 10
- C. 20
- D. 35
Explanation: Fish commonly contains about 20% oil, although the actual amount varies greatly with species, season, diet, and the part of the fish…
Correct answer: 20- A. Has low free fatty acid content
- B. Is odourless
- C. None of these
- D. Has more of unsaturates
Explanation: Solvent extraction alone does not guarantee low free fatty acids, odourlessness, or a higher proportion of unsaturated compounds; these…
Correct answer: None of these2214. ______________ is obtained as a by-product in the manufacture of sodium hydroxide using brine ?
- A. Sodium bi-carbonate
- B. Ammonium chloride
- C. Sodium carbonate
- D. Chlorine
Explanation: The chlor-alkali process electrolyses brine to produce sodium hydroxide along with chlorine and hydrogen.
Correct answer: Chlorine- A. To produce phenol formaldehyde
- B. To produce benzene
- C. To produce polyester resin
- D. As a plasticiser for unsaturated polyester
Explanation: Phenol is used mainly with formaldehyde to manufacture phenol-formaldehyde resins, such as Bakelite.
Correct answer: To produce phenol formaldehyde- A. Does not affect the lather formation by soap
- B. Is not unfit for drinking purpose
- C. Pollutes the water stream
- D. All A, B. and C
Explanation: Hard water is generally not unfit for drinking, although it causes scaling and consumes soap by forming insoluble scum.
Correct answer: Is not unfit for drinking purpose- A. Calcium sulphate
- B. Magnesium chloride
- C. Sodium sulphate
- D. Sodium chloride
Explanation: A zeolite softener is regenerated with concentrated sodium chloride brine.
Correct answer: Sodium chloride- A. -53
- B. -103
- C. -183
- D. -196
Explanation: Oxygen boils at about −183 °C at atmospheric pressure. The value −196 °C belongs approximately to nitrogen, a common confusion in this…
Correct answer: -183- A. Making oxygen
- B. Mining sulphur
- C. Producing helium
- D. Making nitrogen
Explanation: The Frasch process extracts underground sulphur by injecting superheated water to melt the sulphur and compressed air to lift it to the…
Correct answer: Mining sulphur- A. Sulfadiazine
- B. Methyl salicylate
- C. Mestranol
- D. Penicillin
Explanation: Mestranol is a synthetic oestrogen historically used in oral contraceptive formulations.
Correct answer: Mestranol