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  1. Oxidation numbers of P in PO₄³⁻, of S in SO₄²⁻ and that of Cr in Cr₂O₇²⁻
  2. A solid compound X on heating gives CO₂ and a residue .
  3. An aqueous solution of sodium sulphate is electrolysed using inert electrodes
  4. In Duma’s method for estimation of nitrogen, 0.25g of an organic compound
  5. Aqueous solution of Cu (II) gives an intense blue solution with ammonia,which is due