Question

Dinitrogen pentoxide $(N_2O_5)$, a colourless solid, is prepared by :

• A. heating $NH_4NO_2$ with an excess of oxygen
• B. dehydrating $HNO_3$ with $CaO$
• C. dehydrating $HNO_3$ with $P_4O_{10}$
• D. heating a mixture of $HNO_2$ and $Ca(NO_3)_2$

Answer 1

Answer: (C)

dehydrating $HNO_3$ with $P_4O_{10}$

Answer 2

Dinitrogen pentoxide is prepared by treating phosphorus pentoxide with nitric acid. Phosphoric acid is also produced in the process.
$P _{4} O _{10}+12 HNO _{3} \rightarrow 4 H _{3} PO _{4}+6 N _{2} O _{5}$