In the nitroprusside ion,the iron exists as $Fe^{2+}$ and $NO$ as $NO^{+}$ rather than $Fe^{3+}$ and $NO$ respectively. These forms of ions are established with the help of

  • A
    magnetic moment in solid state
  • B
    thermal decomposition method
  • C
    by reaction with $KCN$
  • D
    by action with $K_2SO_4$

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