Free Water Pollution and Treatment MCQs with Answers
10 Water Pollution and Treatment MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Water pollution covers biological, chemical and physical contaminants, including pathogens, toxic metals, detergents and excess nutrients. Treatment involves screening, sedimentation, coagulation, filtration, disinfection and wastewater processing, while biochemical oxygen demand, chemical oxygen demand, eutrophication and dissolved oxygen indicate pollution levels.
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10 questions
- A. Polycyclic hydrocarbons
- B. Mineral acids
- C. D.D.T
- D. Nitrate fertilizers
Explanation: Polycyclic aromatic hydrocarbons (PAHs) are a group of organic compounds that are formed during incomplete combustion of organic matter…
Correct answer: Polycyclic hydrocarbons- A. Formation of NH4Cl , NHCl2 , NCl3 which are eye irritants
- B. Increased risk of bladder and rectal cancer by drinking water
- C. Offensive odour and taste due to chlorinated phenols.
- D. All of the above
Explanation: Disadvantages as advised by CDC guidelines for chlorinated water include following: The drawbacks of chlorination are: Relatively low…
Correct answer: All of the above- A. Caustic soda
- B. Lime water
- C. Alum
- D. Soda ash
Explanation: A is incorrect as caustic soda is not used as a coagulant.B is incorrect as lime water is not used as a coagulant,but is used to detect…
Correct answer: Alum- A. Industries
- B. Transportation
- C. Mining Industry
- D. Agricultural and municipal wastage
Explanation: Contamination of water bodies is called water pollution. Pakistan is an agricultural country.
Correct answer: Agricultural and municipal wastage- A. carbonates of Ca2+ and Mg2+ ions
- B. Bicarbonates of Ca2+ and Mg2+ ions
- C. sulphates of Na+ and Mg2+ ions
- D. chlorides of Ca2+ and Mg2+ ions
Explanation: The presence of soluble salts of calcium and magnesium, i.e., sulfates and chlorides of calcium and magnesium, causes permanent hardness…
Correct answer: chlorides of Ca2+ and Mg2+ ions- A. Ca(NO3)2
- B. MgCl2
- C. Al2(SO4)3
- D. Ca(OH)2
Explanation: In water treatment, coagulants like Al2(SO4)3 (aluminum sulfate) are used to remove impurities by causing them to aggregate for easier…
Correct answer: Al2(SO4)3- A. 6.0 to 7.0
- B. 7.0 to 8.5
- C. 4.5 to 6.0
- D. 8.5 to 9.0
Explanation: It is recommended that the pH of drinking water should be between 6.5-8.5 on a scale that ranges from 0 - 14, hence the answer will be B.
Correct answer: 7.0 to 8.5- A. COD
- B. TOC
- C. BOD
- D. TDS
Explanation: Biochemical oxygen demand (BOD) is a chemical procedure for determining the amount of dissolved oxygen needed by microorganisms in a body…
Correct answer: BOD- A. An Iodide compound
- B. A bromide compound
- C. A chloride compound
- D. A fluoride compound
Explanation: Fluoride is a compound that helps prevent tooth decay by strengthening tooth enamel and making it more resistant to acid attacks from…
Correct answer: A fluoride compound- A. By adding bacteria to the water
- B. Adding chemical oxidizing agent
- C. Both (A) and (B)
- D. None of the above
Explanation: To check the Chemical Oxygen Demand (COD) of water, you typically add bacteria and an oxidizing agent to the water sample.
Correct answer: Both (A) and (B)Water Pollution and Treatment MCQs: common questions
Are these Water Pollution and Treatment MCQs free?
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How many Water Pollution and Treatment MCQs are on this page?
There are 10 Water Pollution and Treatment MCQs in the Chemistry bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Water Pollution and Treatment MCQ have an explanation?
Yes. Each Water Pollution and Treatment question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
Can I take a timed Water Pollution and Treatment test?
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