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Which of the following is/are NOT active disinfectant(s) in water treatment? 

  1. $\cdot \mathrm{OH}$ (hydroxyl radical)
  2. $\mathrm{O}_{3}$ (ozone) 
  3. $\mathrm{OCl}^{-}$(hypochlorite ion) 
  4. $\mathrm{Cl}^{-}$(chloride ion) 
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