A. H2(g)+Cl2(g)⇆2 HCl(g)\mathrm{H}_{2}(\mathrm{g})+\mathrm{Cl}_{2}(\mathrm{g}) \leftrightarrows 2 \mathrm{~HCl}(\mathrm{g})H2(g)+Cl2(g)⇆2 HCl(g)
B. N2(g)+3 H2(g)⇆2 NH3(g)\mathrm{N}_{2}(\mathrm{g})+3 \mathrm{~H}_{2}(\mathrm{g}) \leftrightarrows 2 \mathrm{~NH}_{3}(\mathrm{g})N2(g)+3 H2(g)⇆2 NH3(g)
C. 2 H2O(g)⇆2 H2(g)+O2(g)2 \mathrm{~H}_{2} \mathrm{O}(\mathrm{g}) \leftrightarrows 2 \mathrm{~H}_{2}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g})2 H2O(g)⇆2 H2(g)+O2(g)
D. PCl5(g)⇆PCl3(g)+Cl2(g)\mathrm{PCl}_{5}(\mathrm{g}) \leftrightarrows \mathrm{PCl}_{3}(\mathrm{g})+\mathrm{Cl}_{2}(\mathrm{g})PCl5(g)⇆PCl3(g)+Cl2(g)
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