$Cu^{2+}(aq.) + X^{-}(aq.) \xrightarrow{R.T.} CuX \downarrow + X_2$
$X$ cannot be

  • A
    $Cl^{-}(aq.)$
  • B
    $I^{-}(aq.)$
  • C
    $CN^{-}(aq.)$
  • D
    $SCN^{-}(aq.)$

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