When heated $NH_3$ is passed over $CuO$,the gas evolved is:

Why does $R_{3}P=O$ exist but $R_{3}N=O$ does not ($R=$ alkyl group)?

Which blue liquid is obtained on reacting equimolar amounts of two gases at $-30\,^oC$?

The reaction of white phosphorus with sodium hydroxide solution gives

Dinitrogen and dioxygen are main constituents of air but these do not react with each other to form oxides of nitrogen because .......................

Which among the following oxoacids of phosphorus will have $P-O-P$ bonds?
$I$. $H_4P_2O_5$
$II$. $H_4P_2O_6$
$III$. $H_4P_2O_7$
$IV$. $(HPO_3)_3$