Chemistry - Complete P-block Question with Solution | TestHub

Identify (C) and (D): Non-metals reacting with concentrated $HN{O}_3$ produce $N{O}_2$ (brown gas C), which is paramagnetic. $NaN{O}_2$ reacting with dilute acid produces $NO$ (colorless gas D), which is also paramagnetic (making statement A correct and C incorrect).

Identify (A): The non-metal (A) is Phosphorus ($P_4$), which dissociates at very high temperatures into $P_2$ gas—a molecule that is paramagnetic like $O_2$ (making statement B correct).

Identify (B): The non-oxidizing oxyacid (B) is $H_{3}P{O}_4$, which has a tetrahedral geometry around the phosphorus atom where a maximum of 5 atoms can lie in a single plane (making statement D correct).

Thus, the correct options are A, B, and D.