In the brown ring test,the brown color for $NO_2^-$ and $NO_3^-$ is due to the formation of which complex ion?
- A$[Fe(H_2O)_6]^{2+}$
- B$[Fe(NO)(CN)_5]^{2+}$
- C$[Fe(H_2O)_5(NO)]^{2+}$
- D$[Fe(H_2O)(NO)_5]^{2+}$
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