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Nitrous Acid

Nitrite NO2- ...

Question

Nitrite $(N O_{2}^{-})$ interferes in the ‘ring-test’ of nitrates $(N O_{3}^{-})$ . Among the following reagent(s) that can be used for the removal of nitrite is/are:
I. $N H_{4} C l$
II. $(N H_{2})_{2} C S$ (thiourea)
III. $N H_{2} S O_{3} H$ (sulphamic acid)
Correct choice is

I, II only

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I, II, III

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II, III only

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I only

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Solution

The correct option is B I, II, III
All three reagents can be used:
$N O_{2}^{-} (a q) + N H_{4}^{+} (a q) \to N_{2} + 2 H_{2} O (l)$
$C S (N H_{2})_{2} (a q) + H N O_{2} (a q) \to N_{2} + H^{+} (a q) + S C N^{-} (a q) + 2 H_{2} O (l)$
$H O - S O_{2} - N H_{2} (a q) + H N O_{2} (a q) \to N_{2} (g) + 2 H^{+} (a q) + S O_{4}^{2 -} (a q) + H_{2} O (l)$

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Similar questions

({N O_{2}}^{-})

(N O_{3}^{-})

{N O_{2}}^{-}

({N O}_{2}^{-})

({N O}_{3}^{-})

{N H}_{4} C l

({N H}_{2})_{2} C S

{N H}_{2} {S O}_{3} H

A

B

{N O_{2}}^{-}

N O_{3}^{-}

F e {S O}_{4}

F e {S O}_{4}

{N O}_{2}^{-}

{N O}_{3}^{-}

H_{2} {S O}_{4}

(I)

(I I)

N O

(I I I)

{F e}_{2} {({S O}_{4})}_{3}

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