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  1. Last molecule of H₂O is evolved from H₂O₂ by
  2. Which of the following is a condensation polymer
  3. Boron is unable to form BF₆³⁻ because of
  4. If KMnO₄ is reduced by oxalic caid, in an acidic medium, then oxidation number of Mn changes from
  5. When phenol reacts with phthalic anhydride in presence of H₂SO₄ and heated