Presence of which of the following ion can be detected using ring test?

N O^{-}

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N O_{3}^{-}

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C l^{-}

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P O_{4}^{3 -}

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Solution

The correct option is A $N O_{3}^{-}$
Brown ring test is used in the detection of nitrate $(N O_{3}^{-})$ ion.

First, $H_{2} S O_{4}$ is added in the nitrate ion solution and heated. Then and $F e S O_{4}$ is added in the solution.

During the brown ring test, the complex, $[F e (H_{2} O)_{5} N O]^{2 +}$ is formed which gives a brown colour.

Hence, option $B$ is correct.

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