Question

When concentrated nitric acid is heated with $P_2{O}_5$; it forms?

• A. $H_{3}P{O}_4$
• B. $N{O}_2$
• C. $N_2{O}_5$
• D. $NO$

Answer 1

The correct option is C $N_2{O}_5$

Nitric acid react with phosphorus pentoxide to produce dinitrogen pentoxide($N_2{O}_5$) and phosphorous acids($H_{3}P{O}_3$). This reaction takes place at a temperature.

$2HN{O}_3+P_2{O}_5\to N_2{O}_5+2HP{O}_3$.

Hence option C is correct.