In which of the following reactions is the position of equilibrium not affected by an increase in pressure?
3Fe(s) + 4H2O(g) ⇌ Fe3O4(s) + 4H2(g)
2NO2(g) ⇌ N2O 4(g)
3H2(g) + N2(g) ⇌ 2NH3(g)
2SO2(g) + O2(g) ⇌ 2SO3(g)
Correct answer is A
No explanation has been provided for this answer.