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  1. The oxidation state of S in H₂SO₄ is
  2. A compound,containing only carbon,hydrogen and oxygen,has a molecular weight
  3. In a metal oxide, there is 20% oxygen by weight. its equivalent weight is
  4. An aqueous solution of CoCl₂ on addition of excess of concentration HCl
  5. Phenyl isocyanide test is used to identify