Question

When $HN{{O}_{3}}$ reacts with ${{P}_{4}}{{O}_{10}}$ the compound(s) formed is\are:
[A] $HP{{O}_{3}}$
[B] ${{N}_{2}}{{O}_{3}}$
[C] ${{N}_{2}}{{O}_{5}}$
[D] ${{H}_{3}}P{{O}_{3}}$

Answer 1

Hint: It is also known as aqua fortis and is a highly corrosive mineral acid. The pure compound is colorless, but older samples tend to acquire a yellow cast due to decomposition.
It is a white crystalline solid. It is a dehydrating agent and is used as a strong drying and dehydrating agent.

Complete step by step answer:
First let us know about the reactants in detail.

-$HN{{O}_{3}}$ : Nitric acid is also known as aqua fortis and spirit of niter, is a highly corrosive mineral acid. The pure compound is colorless, but older samples tend to acquire a yellow cast due to decomposition into oxides of nitrogen and water.

-${{P}_{4}}{{O}_{10}}$ : Phosphorus pentoxide is a chemical compound and the white crystalline solid is the anhydride of phosphoric acid. It is a powerful desiccant and dehydrating agent.
Reaction of nitric oxide with phosphorus pentoxide gives us an acid of phosphorus and anhydride of nitric acid.

Now, coming to the products formed:
-$HP{{O}_{3}}$: Its chemical name is metaphosphoric acid.It is a monovalent inorganic anion obtained by deprotonation of one of the two OH groups in phosphonic acid It is a phosphorus oxoanion and a monovalent inorganic anion.

-${{N}_{2}}{{O}_{5}}$: Dinitrogen Pentoxide is the anhydride form of nitric acid, can be made as white crystals, by carefully dehydrating nitric acid with diphosphorus pentoxide or by oxidizing nitrogen dioxide with ozone.
Now, let us see the chemical reaction:
     \[HN{{O}_{3}}+{{P}_{4}}{{O}_{10}}\to HP{{O}_{3}}+{{N}_{2}}{{O}_{5}}\]

We can see from the above reaction that the products formed are metaphosphoric acid and dinitrogen pentoxide.
Therefore, the correct answers are $HP{{O}_{3}}$ and ${{N}_{2}}{{O}_{5}}$
So, the correct answer is “Option A and C”.

Note: Nitric acid is highly corrosive in nature, if inhaled it irritates and burns the lungs throat badly, which can lead to pulmonary edema and death. Breathing nitric acid may cause death and it burns the skin in contact.