Which compound is formed as a violet-colored complex during the test for sulfur?

  • A
    $Na_4[Fe(CN)_5NOS]$
  • B
    $Na_3[Fe(CN)_5NOS]$
  • C
    $Na_2[Fe(CN)_5NOS]$
  • D
    $Na_2[Fe(CN)_5NOS]$

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