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  1. The process used for the extraction of sodium is called
  2. The percentage strength (in g litre⁻¹) of 10 mL of 20 vol.solution of H₂O₂ is
  3. Activated charcoal is used to remove colouring matter from pure substances.
  4. The volume of 3.0 N-H₂O₂ strength is
  5. Which azide is explosive