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During chlorination process, aqueous (aq) chlorine reacts rapidly with water to form $Cl^-,HOCl$, and $H^+$ as shown below $$Cl_2(aq)+H_2O\:{\large\rightleftharpoons}\:HOCl+Cl^-+H^+$$ The most active disinfectant in the chlorination process from amongst the following, is

  1. $H^+$
  2. $HOCl$
  3. $Cl^-$
  4. $H_2O$
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