The compound $YBa_2Cu_3O_7$,which shows superconductivity,has copper in an oxidation state of ........ Assume that the rare earth element Yttrium is in its usual $+3$ oxidation state.

  • A
    $3/7$
  • B
    $7/3$
  • C
    $3$
  • D
    $7$

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