Which of the following is the formula for metaphosphoric acid?

Write four characteristic properties of $p$-block elements.

$A$ metalloid is

Statement $(A)$: Among the oxides of nitrogen, $NO$ and $NO_2$ are paramagnetic.
Statement $(B)$: $NO$ is paramagnetic in the gaseous state and diamagnetic in the liquid state.
The correct answer is:

The reaction of $HNO_3$ with $P_4O_{10}$ produces ....

In group $15$ of the periodic table,nitrogen forms only a trihalide,but other elements form pentahalides also. The reason is: