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  1. Which of the following possible isomers of butanol has a chiral centre
  2. In the conversion of Br₂ to BrO₃⁻, the oxidation number of Br changes from
  3. If r is the radius of the first orbit, the radius of nth-orbit of H-atom is given
  4. Chemical A is used for water softening to remove temporary hardness.
  5. The dark blue colour of the solution formed when excess of ammonia is added