Which of the following elements forms oxides in all oxidation states from $+I$ to $+V$?

The stability of $+1$ oxidation state increases in the sequence:

The bond energies (in $kJ \ mol^{-1}$) of $N-H$,$P-H$,and $As-H$ are respectively:

Zinc on reaction with concentrated nitric acid gives an oxide of nitrogen $(A)$. Zinc with dilute nitric acid gives another oxide of nitrogen $(B)$. Oxidation numbers of nitrogen in $(A)$ and $(B)$ are respectively:

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

What is the $P-P-P$ bond angle in white phosphorus?