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. Glycerine
- B. Nitro glycerine
- C. Salt petre
- D. Dynamite
Explanation: Traditional gunpowder contains charcoal, sulphur and potassium nitrate, commonly called saltpetre.
Correct answer: Salt petre2222. Sucrose content in the raw juice extracted from sugar cane is about _________________ percent?
- A. 1 - 2
- B. 80 - 85
- C. 50 - 60
- D. 15 - 20
Explanation: Raw sugar-cane juice generally contains about 10 to 20% sucrose, so 15 to 20% is the closest listed range.
Correct answer: 15 - 20- A. Anti-redeposition agent
- B. Cleaning power booster
- C. Corrosion inhibitor
- D. Fabric brightener
Explanation: Builders improve detergent performance by softening water, maintaining alkalinity, and helping remove soil, so they act as cleaning-power…
Correct answer: Cleaning power booster- A. High cost of mercury
- B. High specific gravity of mercury
- C. Pollution of water stream by mercury
- D. Non-availability of high purity mercury
Explanation: Mercury leakage can contaminate wastewater and create serious environmental and health hazards, making pollution the major disadvantage of…
Correct answer: Pollution of water stream by mercury- A. Blue pigment
- B. Synthetic resin
- C. Artificial abrasive
- D. Refractory material
Explanation: Kaolin is a clay mineral, mainly hydrated aluminium silicate, and is widely used in refractory products because it withstands high…
Correct answer: Refractory material- A. Rock phosphate
- B. Chalcopyrite
- C. Cryolite
- D. None of these
Explanation: Phosphoric acid is manufactured industrially from phosphate rock, commonly by reacting it with sulfuric acid in the wet process.
Correct answer: Rock phosphate- A. Slag cement
- B. Teflon
- C. Porcelain/Potteries
- D. Glasses
Explanation: Teflon is polytetrafluoroethylene, an organic fluoropolymer, so it is not a ceramic material.
Correct answer: Teflon- A. Phosphoric acid
- B. Phosphorous
- C. All A , B. and C
- D. Superphosphates
Explanation: Phosphate rock supplies phosphorus for phosphoric acid and elemental phosphorus production, and it is also reacted with acids to make…
Correct answer: All A , B. and C- A. SiO2
- B. Al2O3
- C. CaO
- D. Fe2O3
Explanation: Cement contains the most CaO, while SiO2 is generally the second-largest oxide by mass. Al2O3 and Fe2O3 are present in smaller proportions.
Correct answer: SiO2- A. C+ ½O2 = CO
- B. CaCO3 = CaO + CO2
- C. CO + 3H2 = CH4 + H2O
- D. CO + ½O2 = CO2
Explanation: The decomposition of calcium carbonate requires heat, so CaCO3 → CaO + CO2 is endothermic.
Correct answer: CaCO3 = CaO + CO2- A. Benzol-toluol-xylol
- B. Benzol-toluene-xylene
- C. Benzene-toluene-xylene
- D. Benzene-toluol-xylol
Explanation: BTX is the standard abbreviation for benzene, toluene and xylene, the principal aromatic products recovered from coal-tar or petroleum…
Correct answer: Benzene-toluene-xylene- A. Its calorific value is very less
- B. It reduces viscosity and imparts fluidity for its transportation through pipelines at economic
- C. Tar neutralises the residual acids present in pitch
- D. pressure drop
- E. All A, B. and C.
Explanation: Pitch is highly viscous at ordinary temperatures, so mixing it with creosote oil lowers its viscosity and makes pumping through pipelines…
Correct answer: It reduces viscosity and imparts fluidity for its transportation through pipelines at economic- A. Both B. and C.
- B. Allotrope of carbon
- C. Moderator used in nuclear reactor
- D. Electrical insulator
Explanation: Graphite is an allotrope of carbon and is also used as a moderator because its carbon nuclei slow neutrons effectively.
Correct answer: Both B. and C.- A. Methyl alcohol
- B. Hydrochloric acid
- C. Nitric acid
- D. Formic acid
Explanation: A small addition of nitric acid lowers the freezing point of 35% oleum and helps prevent solidification during winter transport.
Correct answer: Nitric acid- A. Cermet
- B. Explosive
- C. Abrasive
- D. Cement
Explanation: Cement is produced from finely ground calcium silicates and calcium aluminates, which hydrate and harden after mixing with water.
Correct answer: Cement- A. 102 - 107
- B. 105 - 109
- C. 102 - 102
- D. 109 - 1011
Explanation: Polymer molecules commonly have molecular weights extending from roughly 10^2 or 10^3 up to about 10^7, depending on the polymer and…
Correct answer: 102 - 107- A. Anthracite
- B. Sub-bituminous
- C. Lignite
- D. Peat
Explanation: Anthracite is the highest-rank coal listed, with the greatest carbon content and therefore the highest calorific value.
Correct answer: Anthracite- A. H2SO4 by Chamber process
- B. Hydrochloric acid
- C. Calcium carbide
- D. Corundum
Explanation: A Mannheim furnace reacts sodium chloride with concentrated sulphuric acid to produce hydrochloric acid and sodium sulphate.
Correct answer: Hydrochloric acid- A. Flocculate the impurities
- B. Facilitate fast filtration
- C. Both A. and B.
- D. Neither A. nor B.
Explanation: Lime neutralizes acidic impurities and promotes their coagulation or flocculation in sugar juice, producing a precipitate that can be…
Correct answer: Both A. and B.- A. SO3
- B. SO2
- C. NH3
- D. Cl2
Explanation: Chlorine oxidizes bromide ions in the hot mother liquor to liberate elemental bromine: 2Br⁻ + Cl₂ → Br₂ + 2Cl⁻.
Correct answer: Cl2