Le-Chatelier principle is not applicable to

Options

A. `H_(2(g))+I_(2(g))hArr2HI_((g))`
B. `Fe_((S))+S_((S))hArrFeS_((S))`
C. `N_(2(g))+3H_(2(g))hArr2NH_(3(g))`
D. `N_(2(g))+O_(2(g))hArr2NO_((g))`

Answer

B

Explanation

Le chatelier principle is not applicable to solid-solid equilibrium.