Here Q is nitric oxide (NO) and statements in options A, B and D are correct while in option C it is incorrect as it does not combine with $\mathrm{F}{\mathrm{e}}_2(\mathrm{S}{\mathrm{O}}_4{)}_3$ but can combine with $\mathrm{F}\mathrm{e}\mathrm{S}{\mathrm{O}}_4$ .
$\mathrm{P}\mathrm{b}+\mathrm{d}\mathrm{i}\mathrm{l}.\mathrm{H}\mathrm{N}{\mathrm{O}}_3\to \mathrm{P}\mathrm{b}(\mathrm{N}{\mathrm{O}}_3{)}_2+\mathrm{N}\mathrm{O}\uparrow +{\mathrm{H}}_2\mathrm{O}$
$\text{NO}(15{\text{e}}^{-})$ paramagnetic, colourless gas
$\mathrm{N}\mathrm{O}\uparrow \stackrel{{\mathrm{O}}_2}{\to }\mathrm{N}{\mathrm{O}}_2\uparrow$ paramagnetic, coloured gas
$\mathrm{H}\mathrm{N}{\mathrm{O}}_2\to \mathrm{H}\mathrm{N}{\mathrm{O}}_3+\mathrm{N}\mathrm{O}\uparrow +{\mathrm{H}}_2\mathrm{O}$