甲:FeCl3+3KSCN⇌Fe(SCN)3+3KCl
乙:CO2(g)+3H2(g)⇌CH3OH(g)+H2O(g)
丙:H2(g)+I2(g)⇌2HI(g)
丁:2SO2(g)+O2 (g) ⇌2SO3 (g)