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  1. The fractional distillation is used in
  2. The electronegativity of the following elements increases in the order.
  3. At 0K, (i) ¹²C and (ii) a mixture of ¹²C and ¹⁴C will
  4. What is formed when hydrogen atom of the -OH group in phenol is replaced by
  5. The correct order of stability of the superoxides is