Which of the following is the most lethal water pollutant ?
Correct answer: A. Phenol and cyanide
- A. Phenol and cyanide
- B. Chlorine
- C. Alkalis
- D. Suspended solids
Explanation
Cyanide is extremely lethal because it prevents cells from using oxygen, and phenolic compounds can also be highly toxic to aquatic life. Chlorine, alkalis and suspended solids can cause pollution, but are generally less lethal at comparable environmental exposure.
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