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  1. Which of the following gas is called rare gas
  2. In the manufacture of sulphuric acid by contact process, Tyndall box is used to
  3. As the alkaline earth metals (except Be) tend to lose their valence electrons
  4. Correct order of first IP among following elements Be, B, C, N, O is
  5. The dark blue colour of the solution formed when excess of ammonia is added