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  1. The flame colours of metals ions are due to
  2. The action of nitrous acid on an aliphatic primary amine,gives
  3. The calorific value of fats,carbohydrates and proteins is in the order of
  4. Of the following which one is classified as polymer
  5. The bond dissociation energies of H₂, Cl₂ and HCl are 104, 58, and 103