Assertion : ${N O}_{2}^{-}$ ion cannot be detected in presence of ${N O}_{3}^{-}$ ions. Reason: Both ${N O}_{2}^{-}$ and ${N O}_{2}^{-}$ ions are confirmed by brown ring test.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is incorrect but Reason is correct.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is C Assertion is incorrect but Reason is correct.
$N O_{2}^{-}$ ions can be detected in the presence of $N o_{3}^{-}$ ions as.
Also, both $N O_{2}^{-}$ and $N O_{3}^{-}$ ions are confirmed by brown ring test. Brown ring test is performed, by adding $I r o n (I I) s u l p h a t e$ to a solution of a nitrate. Then slowly adding concentrated $H_{2} S O_{4}$ such that the acid forms a layer below the aqueous solution.

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Assertion :NO−2 ion cannot be detected in presence of NO−3 ions. Reason: Both NO−2 and NO−2 ions are confirmed by brown ring test.

Assertion : ${N O}_{2}^{-}$ ion cannot be detected in presence of ${N O}_{3}^{-}$ ions. Reason: Both ${N O}_{2}^{-}$ and ${N O}_{2}^{-}$ ions are confirmed by brown ring test.