Phosphorus reacts with chlorine gas to give a colourless liquid,which fumes in moist air to produce $HCl$ and

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:

Which of the following halides is most acidic?

$PCl_5$ exists but $NCl_5$ does not because:

$P_4 + 3 NaOH + 3 H_2 O \xrightarrow{CO_2} 3 X + PH_3 \uparrow$
$X \xrightarrow{HCl_{(aq)}} Y + NaCl$
The incorrect statement about $Y$ is

Which of the following is not correct?