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  1. IF the bond energies of H – H , Br – Br and H – Br are 433 , 192 and 364 kJ mol⁻¹
  2. The unit in which the solubility product of barium phosphate is expressed as
  3. Which of the following has sp²-hybridisation
  4. Oxygen is not evolved on reaction of ozone with
  5. When alkyl halide is heated, with dry Ag₂O, it produces