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  1. Which of the following has zero valency
  2. An organic compound containing C, H, N gave the following analysis
  3. If 1 mL of water contains 20 drops then number of molecules in a drop of water
  4. Ethyl alcohol gives ethyl chloride with the help of
  5. If Nₐ is Avagadro number then number of valence electrons in 4.2g of nitride