The main reason for the brown ring test of $NO_3^-$ is:

  • A
    Negligible tendency of $FeSO_4$ to form complex
  • B
    Reducing power of $FeSO_4$ to convert $NO_3^-$ to $NO$
  • C
    Decomposition of $FeSO_4$ to give $SO_2$ gas
  • D
    Oxidising property of $FeSO_4$

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