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  1. A certain mass of gas occupies a volume of 300 c.c. at 27⁰C and 620 mm pressure
  2. Action of nitrous acid on ethyl amine gives
  3. When two atoms of chlorine combine to form one molecule of chlorine gas
  4. The solubility of saturated solution of calcium fluoride is 2 ˣ 10⁻⁴ moles
  5. Activated charcoal is used to remove colouring matter from pure substances.