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  1. Which one of the following is a false statement
  2. The role of cryolite in the metallurgy of extraction of aluminium is to
  3. When the ore limestone is heated carbon dioxide is given off. This operation
  4. Which of the following is used as refrigerant
  5. In the following reaction CHCl₃ + C₆H₅NH₂ + 3NaOH → A + 3B + 3C the product