The reaction that does not produce nitrogen is

The acidic character of the group-$15$ elements' oxides in increasing order is:

$NH_3$ is $NOT$ used in which of the following?

Which of the following is the correct decreasing order of bond angles in the hydrides of group $15$ elements?

At what temperature is white phosphorus heated to form $\beta$-black phosphorus (in $K$)?

Which is the correct sequence in the following properties? For the correct order mark $(T)$ and for the incorrect order mark $(F)$.
$(a)$ Lewis acidity order : $SiF_4 < SiCl_4 < SiBr_4 < SiI_4$
$(b)$ Melting point : $NH_3 > SbH_3 > AsH_3 > PH_3$
$(c)$ Boiling point : $NH_3 > SbH_3 > AsH_3 > PH_3$
$(d)$ Dipole moment order : $NH_3 > SbH_3 > AsH_3 > PH_3$