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  1. The method of zone refining of metals is based on the principle of
  2. The greenhouse gas is
  3. The number of moles of KMnO₄ reduced by one mole of KI in alkaline medium is
  4. An ion has 18 electrons in the outermost shell, it is
  5. In the complex with formula MCl₃.4H₂O, the coordination number of the metal M