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Ion Electron Method

A mixture is ...

Question

A mixture is known to contain ${N O}_{3}^{-}$ and ${N O}_{2}^{-}$ . Before performing ring test for ${N O}_{3}^{-}$ , the aqueous solution should be made free of ${N O}_{2}^{-}$ . This is done by heating aqueous extract with:

A

conc.

{H N O}_{3}

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B

dil.

{H N O}_{3}

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C

urea

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D

zinc dust

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Solution

The correct option is C urea
In the mixture of nitrite and nitrate ions, the nitrite ions can be removed by heating with urea and sulphuric acid.
$2 N a N O_{2} + H_{2} S O_{4} \to N a_{2} S O_{4} + 2 H N O_{2}$
$2 H N O_{2} + C O (N H_{2})_{2} \to C O_{2} + N_{2} + 3 H_{2} O$

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