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  1. When chlorine water is exposed to sunlight, the colour change that occurs is
  2. The common acid used in the manufacture of rayon and plastics is
  3. If heat of formation of C + O₂ → 2CO is ΔH = -110.5 kcal,then heat of combustion
  4. Average molar kinetic energy of CO and N₂ at same temperature is
  5. Which of the following gas is called rare gas