Nitrate is formed by the ring test. Which of the metal ion produces the brown colour of ring?

Iron

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Chromium

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Vanadium

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None of the above

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Solution

The correct option is A Iron
Brown ring test is performed by adding iron(II) sulphate to a solution of nitrate and slowly adding sulphuric acid forming a brown ring in the test tube. A brown ring is formed at the junction of two layers indicating the presence of nitrate ion.
$2 H {N O}_{3} + 3 H_{2} {S O}_{4} + 6 F e {S O}_{4} \to 3 {F e}_{2} ({S O}_{4})_{3} + 2 N O + 4 H_{2} O$

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If a salt produces a brown ring in the brown ring test it is a nitrate salt.

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