Which of the following compounds would result in the reaction being more active in the reverse direction?
In fact, adding more ion hydroxide won't displace the equilibrium towards the reverse reaction. This is due to the fact that ion complex $\ce{[Fe(OH)4]^{-2}}$, which is stable in presence of excess of ion hydroxide, is formed by successive addition of ion hydroxide on ferrous hydroxide.
If you want to study this more in depth, I invite you to read this webpage
It's explained at the end of the page under &quot;numerical problems&quot;.