In drinking water,if the maximum prescribed concentration of copper is $x \ mg \ dm^{-3}$,the maximum prescribed concentration of zinc will be

  • A
    $3.0 \ mg \ dm^{-3}$
  • B
    $5.0 \ mg \ dm^{-3}$
  • C
    $1.0 \ mg \ dm^{-3}$
  • D
    $2.0 \ mg \ dm^{-3}$

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