In the electrolytic refining of an impure metal,a rod of impure metal is used as the anode and a rod of pure metal is used as the cathode,and the aqueous solution of its salt is electrolyzed. Which of the following metals cannot be refined by this method?

  • A
    $Ag$
  • B
    $Cu$
  • C
    $Al$
  • D
    $Au$

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