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. Turbidity
- B. Bacteria
- C. Hardness
- D. Odour
Explanation: Disinfection is intended to destroy or inactivate disease-causing microorganisms, especially bacteria.
Correct answer: Bacteria- A. Presumptive
- B. Electometric
- C. Total count
- D. EDTA
Explanation: The EDTA complexometric titration is the standard laboratory test for total water hardness because EDTA binds the calcium and magnesium…
Correct answer: EDTA- A. Oil & fatty
- B. Suspended solid
- C. Dissolved solid
- D. Gritty & inorganic
Explanation: A skimming tank removes floating substances such as oil, grease and fats by allowing them to rise to the surface for collection.
Correct answer: Oil & fatty- A. CO2
- B. CFC (chloro fluoro carbon)
- C. Hydrocarbons
- D. SO2
Explanation: CFCs release chlorine radicals in the stratosphere, and these radicals catalytically destroy ozone.
Correct answer: CFC (chloro fluoro carbon)- A. Thermosphere
- B. Stratosphere
- C. Troposphere
- D. None of these
Explanation: The troposphere is the lowest atmospheric layer and contains most atmospheric water vapour, so clouds, rain, storms and lightning occur…
Correct answer: Troposphere- A. All A., B. and C.
- B. Forest fire
- C. Bacterial action in soil and swamp areas
- D. Automobile exhaust
Explanation: Automobile exhaust is a clearly manmade source, releasing pollutants such as carbon monoxide, nitrogen oxides and hydrocarbons.
Correct answer: Automobile exhaust- A. Fluorine
- B. Calcium
- C. Phosphorous
- D. Sulphur
Explanation: Fluorine compounds in phosphate rock are the main pollutant concern because phosphate processing can release hydrogen fluoride and other…
Correct answer: Fluorine- A. Centrifugation
- B. Floatation & skimming
- C. Chemical coagulation
- D. Ultra filtration
Explanation: Chemical coagulation is primarily used to destabilise suspended and colloidal contaminants, whereas oily impurities are commonly separated…
Correct answer: Chemical coagulation- A. 10
- B. 20
- C. 40
- D. 80
Explanation: Ringelmann chart number 2 represents about 40% blackness or opacity. The scale increases approximately from 0% for No. 0 to 100% for No.
Correct answer: 40- A. Flood
- B. Cyclone
- C. Decrease in food productivity
- D. All A., B. and C.
Explanation: Global warming can increase flooding and alter cyclone behaviour, while heat stress, drought, and changing rainfall can reduce food…
Correct answer: All A., B. and C.- A. All A., B. & C.
- B. Chlorine or its compounds
- C. Ultraviolet light for irradiation of water
- D. Ozone and iodine
Explanation: Water can be disinfected using chemical oxidants such as chlorine, ozone, or iodine, and by physical irradiation with ultraviolet light.
Correct answer: All A., B. & C.- A. Dilution with inert material
- B. Filling in steel crates and shooting it off out of earth's gravity
- C. Disposing off in rivers & oceans
- D. Discharging to atmosphere through tall stacks after dilution
Explanation: Launching radioactive waste beyond Earth’s gravitational influence is not a practical disposal method because of extreme cost and the…
Correct answer: Filling in steel crates and shooting it off out of earth's gravity- A. Catalytic conversion
- B. Green house effect
- C. Both B. and C.
- D. Global warming
Explanation: The greenhouse effect is the heat-trapping mechanism intensified by increased atmospheric carbon dioxide, while global warming is its…
Correct answer: Both B. and C.- A. Color
- B. Bad taste
- C. Foul odour
- D. Bacteria
Explanation: Disinfection targets disease-causing microorganisms, especially bacteria, viruses and protozoa.
Correct answer: Bacteria- A. Hardness
- B. Alkalinity
- C. Acidity
- D. Iron & zinc
Explanation: The zeolite process exchanges sodium ions in the zeolite for calcium and magnesium ions in water, thereby reducing hardness.
Correct answer: Hardness- A. Mercury
- B. Aluminium
- C. Arsenic
- D. Lead
Explanation: Mercury, arsenic and lead are well-known toxic heavy-metal pollutants, whereas aluminium is not usually included in the standard list of…
Correct answer: Aluminium- A. Non-catalytic
- B. Endothermic
- C. Exothermic
- D. Autocatalytic
Explanation: Ammonia oxidation releases heat, whether carried out catalytically to form nitric oxide or by other oxidation routes.
Correct answer: Exothermic- A. Has a pungent smell
- B. Is in short supply
- C. Is toxic and highly corrosive
- D. Vaporises at normal temperature
Explanation: Liquid ammonia has a high vapour pressure and readily vaporises at ordinary tropical temperatures, making storage, handling and…
Correct answer: Vaporises at normal temperature- A. Liquid ammonia
- B. Ammonium phosphate
- C. Urea
- D. Ammonium sulphate
Explanation: Ammonium phosphate contains less nitrogen than the other listed fertilisers: common grades contain about 11 to 18% nitrogen, compared with…
Correct answer: Ammonium phosphate- A. Phosphoric acid
- B. Ammonium phosphate
- C. Phosphorous
- D. Superphosphate
Explanation: In the electric-furnace process, phosphate rock is reduced by coke in the presence of silica, producing elemental phosphorus vapour that…
Correct answer: Phosphorous