The brown ring test for \( \mathrm{NO}_{2}^{-} \)and \( \mathrm{NO}_{3}^{-} \)is due to the form...

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The brown ring test for \( \mathrm{NO}_{2}^{-} \)and \( \mathrm{NO}_{3}^{-} \)is due to the formation of complex ion with formula -
(A) \( \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \)
(B) \( \left[\mathrm{Fe}(\mathrm{NO})(\mathrm{CN})_{5}\right]^{2-} \)
(C) \( \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{NO}\right]^{2+} \)
(D) \( \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)(\mathrm{NO})_{5}\right]^{2+} \)
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