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  1. In acidic medium, the equivalent weight of KMnO₄ is
  2. The mixture of n-hexane and n-heptane is an example of
  3. In the extraction of copper from its sulphide ore, the metal is finally obtained
  4. The method not used in metallurgy to refine the impure metal is
  5. In methane four C-H bonds are directed towards the corners of