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  1. K₂Cr₂O₇ on heating with aqueous NaOH gives
  2. The metal used to recover copper from a solution of copper sulphate is
  3. Which one of the following is produced when acetone is saturated with HCl gas
  4. The presence of colloidal particles can be confirmed with the help of
  5. The oxidation number of As in H₂AsO₄⁻ is