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  1. Addition of phosphate fertilizers into water leads to
  2. The energy of an electron in the nth Bohr orbit of hydrogen atom is
  3. In the presence of Lewis acid toluene reacts with chlorine to give
  4. Phenol is heated with pthalic anhydride in the presence of concentrated H₂SO₄.
  5. The calorific value of fats,carbohydrates and proteins is in the order of