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  • In the ring test of NO^{3-} ion, Fe^{2+} ion reduces nitrate ion to nitric oxide, which combines with Fe^{2+}(aq) ion to form the brown complex. Write the reactions involved in the formation of a brown ring.

In the ring test of NO^{-}_{3} ion, Fe^{2+} ion reduces nitrate ion to nitric oxide, which combines with  Fe^{2+}(aq) ion to form the brown complex. Write the reactions involved in the formation of a brown ring.

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             NO_{3}^{-}+3Fe^{2+}+4H^{+}\rightarrow NO+3Fe^{3+}+2H_{2}O

\left [ Fe\left ( H_{2}O \right )_{6} \right ]SO_{4}+NO\rightarrow \left [ Fe\left ( H_{2}O \right )_{5}NO \right ]SO_{4}\; \left ( Brown \; Complex \right )+H_{2}O

 

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