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  1. If 1 mL of water contains 20 drops then number of molecules in a drop of water
  2. In which of the solutions containing following solutes, its normality is equal
  3. Ethyne can be oxidised to oxalic acid by using
  4. Nitrogen dioxide and sulphur dioxide have some properties in common.
  5. If electron has spin quantum number +1/2 and magnetic quantum number –1,it cannot