What is the correct name for \[{{\text{N}}_2}{{\text{O}}_5}\] ?
A.Dinitrogen pentoxide
B.Dinitrogen tetroxide
C.Pentoxygen dinitride
D.Nitrogen pentoxide
E.Pentanitrogen dioxide

Hint: To write the IUPAC name for the given compound we have to specify the numbers of respective atoms there. For this we have to add the required prefix. The prefix used for 2 is di and 5 for pent.

Complete step by step answer:
\[{\text{N}}\] Represents the nitrogen element whose atomic number is 7 and mass number is 14. \[{\text{O}}\] Represents oxygen whose atomic number is 8 and mass number us 16. Since nitrogen forms many oxides we have to write a prefix as well to differentiate various oxides of nitrogen. Using the prefix di for two and five for pent we will get the name as dinitrogen pentoxide.

Hence, the correct option is A.

Additional information:
Dinitrogen pentoxide is a binary compound that contains the elements nitrogen and oxygen. Binary compounds are those compounds which consist of only two elements. it exists as solid at room temperature but sublimates to a colourless gas when temperature is raised slightly above room temperature. It is a very good oxidizing agent. Dinitrogen pentoxide is one among the gases that are responsible for ozone depletion. It is hydrolyzed to form an nitric acid mixture that forms an explosive mixture with an organic compound. Its decomposition produces nitrogen dioxide gas which is highly toxic. It is relatively less stable and decomposes into nitrogen dioxide and oxygen. It also reacts with hydrochloric acid to form nitric acid and nitryl chloride.

Note:
Due to possession of five valence electrons nitrogen forms five different types of oxides namely dinitrogen oxygen, nitrogen monoxide, dinitrogen trioxide, nitrogen dioxide and nitrogen pentoxide.