The following reaction occurs at 500 K. Arrange them in the order of increasing tendency to proceed to completion.
(I) H2(g)+I2(g)⇌2HI(g); Kc=1.8×10−3
(II) N2O4⇌2NO2(g); Kc=3×10−3
(III) PCl5(g)⇌PCl3(g)+Cl2(g); Kc=1.3×10−4
(IV) 2SO3(g)⇌2SO2(g)+O2(g); Kc=1.3×10−5