নিম্নের কোন বিক্রিয়াটি দ্বিমুখী কিন্তু একমুখী দেখানো হয়েছে?

$2 \mathrm{KClO}_{2}(\mathrm{~s}) \triangleq 2 \mathrm{KCl}(\mathrm{s})+3 \mathrm{O}_{2}(\mathrm{~g})$

$\mathrm{H}_{2}(\mathrm{~g})+\mathrm{I}_{2}(\mathrm{~g}) \ \underline{450^{\circ} \mathrm{C}} \ 2 \mathrm{HI}(\mathrm{g})$

$\mathrm{H}_{2}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{HCl}(\mathrm{g})$

$2 \mathrm{HI}(\mathrm{g})\ \underline{450^{\circ} \mathrm{C}} \ \mathrm{H}_{2}(\mathrm{~g})+\mathrm{I}_{2}(\mathrm{~g})$

B & D