Which of the following is used as water disinfectant to avoid the formation of toxic compounds_________________?
Correct answer: D. both B & C
- A. Cl2
- B. O3
- C. ClO2
- D. both B & C
Explanation
Ozone and chlorine dioxide are effective water disinfectants and do not produce the chlorinated organic by-products associated with ordinary chlorine treatment to the same extent. Chlorine gas is the likely wrong choice because it is a traditional disinfectant but can form harmful chlorinated compounds.
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About Real and Ideal Gases
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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