$A$ mixture of ammonia and air at about $800\,^{\circ}C$ in the presence of $Pt$ gauze forms:

Strong reducing behaviour of $H_3PO_2$ is due to

In which of the following arrangements,the order is not strictly according to the property written against it?

The compound$(s)$ which generate$(s)$ $N_2$ gas upon thermal decomposition below $300^{\circ} C$ is (are)
$(A)$ $NH_4 NO_3$
$(B)$ $(NH_4)_2 Cr_2 O_7$
$(C)$ $Ba(N_3)_2$
$(D)$ $Mg_3 N_2$

For making $Ag$ from $AgNO_3$,which of the following is used?

Why does $PCl_3$ fume in moisture?