The number of sodium ions present in $0.5 \ mol$ of sodium ferrocyanide is?

  • A
    $2 \times 10^{23}$
  • B
    $0.5 \times 10^{23}$
  • C
    $12 \times 10^{23}$
  • D
    $4 \times 10^{23}$

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