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  4. A brown ring is formed in the ring test for NO 3-ion. It is due to the formation of

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Q. A brown ring is formed in the ring test for $NO _{3}^{-}$ion. It is due to the formation of

Solution:

Correct answer is (a) $\left[ Fe \left( H _{2} O \right)_{5}( NO )\right]^{2+}$