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 139 of 350
- A. Flint
- B. Soda
- C. Pyrex
- D. Crooke's
Explanation: Flint glass has a high refractive index and good optical properties, making it suitable for optical glass and lenses.
Correct answer: Flint- A. N2 and H2
- B. CO and H2
- C. H2, CH4 and CO
- D. CO2 and H2
Explanation: Synthesis gas, or syngas, is principally a mixture of carbon monoxide and hydrogen produced by processes such as steam reforming or…
Correct answer: CO and H2- A. Titanium dioxide
- B. Ferrous sulphate
- C. Lead chromates
- D. Zinc sulphides
Explanation: Lead chromates, especially chrome yellow, are bright yellow pigments used in paints and coatings.
Correct answer: Lead chromates- A. Explosive
- B. None of these
- C. Detergents additive
- D. Rocket fuel
Explanation: Hydrazine is mainly used as a high-energy rocket propellant and as a fuel in spacecraft propulsion systems.
Correct answer: Rocket fuel- A. All A, B, and C.
- B. Hospitals for medicinal purposes
- C. Gas masks and artificial breathing apparatus
- D. Cutting and welding by oxy-acetylene flame
Explanation: High-purity oxygen is used with acetylene for cutting and welding, supplied medically, and used in breathing apparatus.
Correct answer: All A, B, and C.- A. Lead
- B. Copper
- C. Tin
- D. Iron
Explanation: Chalcopyrite is copper iron sulfide, CuFeS₂, and is the most important ore of copper.
Correct answer: Copper2767. Pig iron is produced by blast furnaces in India using mostly the iron ore named _______________?
- A. Siderite
- B. Magnetite
- C. Hematite
- D. Chalcopyrite
Explanation: Hematite, Fe₂O₃, is a major iron ore and has traditionally been the principal ore used for pig-iron production in Indian blast furnaces.
Correct answer: Hematite- A. Fatty oil and metallic soap
- B. Mineral oil and metallic soap
- C. Mineral oil and fatty oil
- D. Mineral oil, soap and additives
Explanation: Lubricating grease is commonly made by thickening mineral oil with metallic soap, followed by additives for properties such as oxidation…
Correct answer: Mineral oil, soap and additives- A. Coke oven gas
- B. L.D. converter gas
- C. Blast furnace gas
- D. Water gas
Explanation: L.D. converter gas contains a very high proportion of carbon monoxide, often around 60 to 80 percent by volume.
Correct answer: L.D. converter gas- A. Chamber
- B. Chance
- C. Solvay
- D. Tromp
Explanation: The Solvay process produces soda ash, Na2CO3, from brine and limestone using ammonia as a recyclable auxiliary.
Correct answer: Solvay- A. Lignin
- B. Starch
- C. Cellulose
- D. Gelatine
Explanation: Cotton fibers are composed almost entirely of cellulose, a polysaccharide made of repeating glucose units.
Correct answer: Cellulose- A. Neither light nor heavy leather
- B. Heavy & light leather respectively
- C. Both light & heavy leather
- D. Light & heavy leather respectively
Explanation: Chrome tanning produces softer, lighter leather, whereas vegetable tanning generally produces heavier and firmer leather.
Correct answer: Light & heavy leather respectively- A. Called ester value
- B. Always negative
- C. Constant for all fatty oils
- D. None of these
Explanation: Saponification value measures the alkali needed to hydrolyse both esters and free fatty acids, while acid value measures only the free…
Correct answer: Called ester value- A. NaCl
- B. NH3
- C. CaO
- D. Coke
Explanation: Ammonia is used in the Solvay process to absorb carbon dioxide and form ammonium bicarbonate, then it is regenerated and recycled.
Correct answer: NH3- A. ZnCl2
- B. Al2O3
- C. AgO
- D. Fe2O3
Explanation: Ethylene is directly oxidised to ethylene oxide over a silver-based catalyst, commonly supported on alumina.
Correct answer: AgO2776. Carbon tetrachloride (CCl4) is the starting raw material for the manufacture of____________________?
- A. Perchloroethylene
- B. Trichloroethylene
- C. Parathion
- D. Methanol
Explanation: Carbon tetrachloride can be chlorinated and converted to perchloroethylene, C2Cl4, an important chlorinated solvent.
Correct answer: Perchloroethylene- A. Rhombic sulphur
- B. Plastic sulphur
- C. Monoclinic sulphur
- D. Milk of sulphur
Explanation: Plastic sulphur is an amorphous, polymeric form of sulphur and is insoluble in carbon disulphide.
Correct answer: Plastic sulphur- A. High spalling tendency
- B. Less resistance to corrosion by slags
- C. Greater resistance to corrosion by slags
- D. None of these
Explanation: Very high-temperature firing promotes sintering and produces a dense, stable refractory structure, improving resistance to attack by…
Correct answer: Greater resistance to corrosion by slags- A. CaSO4
- B. MgCO3
- C. Na2CO3
- D. CaCO3
Explanation: Limestone is primarily calcium carbonate, CaCO3, although natural deposits may contain small amounts of impurities such as magnesium…
Correct answer: CaCO3- A. Oleum
- B. Sulphurous acid
- C. Concentrated H2SO4
- D. None of these
Explanation: Oleum is sulphuric acid containing dissolved excess SO3, commonly represented as H2SO4·SO3.
Correct answer: Oleum