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  1. The method of zone refining of metals is based on the principle of
  2. In the reaction : 2N₂O₅ → 4NO₂ + O₂, initial pressure is 500 atm and rate
  3. The oxidation number of nitrogen in HNO₃ is
  4. Sea weeds are an important source of
  5. From the colligative properties of solution which one is the best method for