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  1. The method of zone refining of metals is based on the principle of
  2. Which one of the following explains light both as stream of particle and as wave
  3. The reaction of chloroform with ethylamine in alcoholic alkali gives
  4. The compound which on reaction with aqueous nitrous acid at low temperature
  5. In N₂ + 3H₂ → 2NH₃ reversible reaction ,increases in pressure will favour