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  1. A mixture of champhor and benzoic acid can be separated by
  2. Bauxite is concentrated by
  3. Photochemical smog is due to the presence of
  4. The atomic number of cobalt is 27. The EAN of cobalt in Na₃[Co(NO₂)₄Cl₂] is
  5. If 300 mL of a gas at 27⁰ C is cooled to 7⁰C at constant pressure, its final volume