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  1. Which one of the following metals forms superoxide?
  2. Roasting is done in
  3. When 4g of iron is burnt to ferric oxide at constant pressure, 29.28 kJ of heat
  4. Phenol is heated with pthalic anhydride in the presence of concentrated H₂SO₄.
  5. Change in enthalpy for reaction,2H₂O₂ → 2H₂O + O₂