Cân bằng hoá học nào sau đây không bị chuyển dịch khi thay đổi áp suất?

$2{\text{SO}}_2(\text{g})+{\text{O}}_2(\text{g})\rightleftharpoons 2{\text{SO}}_3(\text{g})$

$\text{C}\left(\text{s}\right)+{\text{H}}_2\text{O}\left(\text{g}\right)\rightleftharpoons \text{CO}\left(\text{g}\right)+{\text{H}}_2(\text{g})$

${\text{PCl}}_3(\text{g})+{\text{Cl}}_2(\text{g})\rightleftharpoons {\text{PCl}}_5(\text{g})$

$3\text{Fe}\left(\text{s}\right)+4{\text{H}}_2\text{O}\left(\text{g}\right)\rightleftharpoons {\text{Fe}}_3{\text{O}}_4(\text{s})+4{\text{H}}_2(\text{g})$