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  1. Which one of the following is present as an active ingredient in bleaching
  2. In which one of the following is not a buffer solution
  3. 8.2 L of an ideal gas weight 9.0 gm at 300 K and 1 atm pressure
  4. Water softening by Clark’s process uses
  5. A compound with empirical formula CH₂O has a vapour density of 30.Its molecular