Question

Dinitrogen pentoxide $\left(N_2{O}_5\right)$, a colourless solid, is prepared by:

• A. heating $N{H}_{4}N{O}_2$ with an excess of oxygen
• B. dehydrating $HN{O}_3$ with $CaO$
• C. dehydrating $HN{O}_3$ with $P_4{O}_{10}$
• D. heating a mixture of $HN{O}_2$ and $Ca(N{O}_3{)}_2$

Answer 1

The correct option is C dehydrating $HN{O}_3$ with $P_4{O}_{10}$

Dinitrogen pentoxide is prepared by treating phosphorus pentoxide with nitric acid. Phosphoric acid is also produced in the process.

$P_4{O}_{10}+12HN{O}_3\to 4H_{3}P{O}_4+6N_2{O}_5$