Question

If ${\mathrm{P}}_4{\mathrm{O}}_{10}+{\mathrm{HNO}}_3$ are mixed in a $1:4$ ratio, then the nature of nitrogen oxide obtained will be:

• A. Acidic
• B. Basic
• C. Amphoteric
• D. Neutral

Answer 1

The correct option is A

Acidic

Explanation for the correct option:

The ratio of the mixture

When the single compound of Phosphorus pentoxide $\mathit{\left(}{\mathit{P}}_{\mathit{4}}{\mathit{O}}_{\mathit{10}}\mathit{\right)}$ react with four compound of Nitric acid $\left({\text{HNO}}_{\text{3}}\right)$ gives Metaphosphoric acid $\left(HP{O}_3\right)$ and Dinitrogen pentoxide $\left(N_2{O}_5\right)$

$\underset{\mathrm{Phosphorus}\mathrm{pentoxide}}{{\mathrm{P}}_4{\mathrm{O}}_{10}}+4\underset{\mathrm{Nitric}\mathrm{acid}}{{\mathrm{HNO}}_3}\to \underset{\mathrm{Metaphosphoric}\mathrm{acids}}{4{\mathrm{HPO}}_3}+\underset{\mathrm{Dinitrogen}\mathrm{pentoxide}}{2{\mathrm{N}}_2{\mathrm{O}}_5}$

Dinitrogen Pentoxide $\left(N_2{O}_5\right)$ is the anhydride form of Nitric acid and can be made as white crystals, by dehydrating Nitric acid with diphosphorus Pentoxide or by oxidizing Nitrogen dioxide $\left({\mathrm{NO}}_2\right)$ with ozone.

Therefore, the nature of the compound is acidic.

Hence, the correct option is (A).