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Q.

In which of the following reactions is there a change in the oxidation number of nitrogen atoms?

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a

$2 {NO}_{2} ⟶ N_{2} O_{4}$

b

${NH}_{3} + H_{2} O ⟶ {NH}_{4}^{+} + {OH}^{-}$

c

$N_{2} O_{5} + H_{2} O ⟶ 2 {HNO}_{3}$

d

None of these

answer is D.

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Detailed Solution

In none of the given there is no change in the oxidation number of nitrogen atom.

In option A, nitrogen has oxidation state of +4 in both reactant and product.

In option B, nitrogen has oxidation state of −3 in both reactant and product

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