Question

which of the following gives nitrogen dioxide when reacting with concentrated nitric acid​

Answer 1

Answer:

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Explanation:

Nitric acid is made by reaction of nitrogen dioxide (NO2) with water. The net reaction is: 3 NO2 + H2O → 2 HNO3 + NO.Normally, the nitric oxide produced by the reaction is reoxidized by the oxygen in air to produce additional nitrogen dioxide.

Answer 2

$\mathrm{Cu}+4 \mathrm{HNO}_{3}(\text { Conc. }) \rightarrow+\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}+2 \mathrm{NO}_{2}+2 \mathrm{H}_{2} \mathrm{O}$

When copper reacts with concentrated HNO3  it gives nitrogen dioxide.