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  1. Pyrolusite is an ore of
  2. H₂S₂O₇ has a commercial name as
  3. The presence of colloidal particles can be confirmed with the help of
  4. When 1 mol of gas is heated at constant volume,temperature is raised
  5. Decreasing order of stability of O₂ , O₂⁻ , O₂⁺ and O₂²⁻ is