When $PbO_2$ reacts with concentrated $HNO_3$,the evolved gas is:

Among the following compounds,the one which does not produce nitrogen gas upon heating is

White phosphorus,when heated with conc. $NaOH$ solution in an inert atmosphere of $CO_2$,forms phosphine and a sodium salt of oxoacid of phosphorus,$'X'$. The oxidation state of phosphorus in $'X'$ is

Nitrogen gas is obtained by thermal decomposition of .... .

Which of the following compounds will not give $NH_3$ on heating?

White phosphorus when boiled with a strong solution of caustic soda produces: