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  1. The catalyst used in the manufacture of H₂SO₄ by contact process is
  2. An aqueous solution of CoCl₂ on addition of excess of concentration HCl
  3. There is no S – S bond in
  4. The elements with atomic number 9,17,35,53,85 are called
  5. Ethylene glycol reacts with excess of PCl₅ to give