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  1. Biochemical oxygen Demand ,(BOD) is a measure of organic material present in water
  2. Treatment of a mixture of CH₃Cl and C₂H₅Cl with sodium in dry ether can generat
  3. Which of the following compounds has the highest boiling point
  4. The number of unpaired electron in Mn²⁺ is
  5. The temperature above which a gas cannot be liquefied is called as