JEE · NEET Previous Year Question

In the reaction, $\text{Fe}\text{(}\text{OH}{\text{)}}_{3\text{(}s\text{)}}\text{⇌}{\text{Fe}}^{3+}{}_{\text{(}\text{aq}\text{)}}+3{\text{OH}}^{-}{}_{\text{(}\text{aq}\text{)}\text{,}}$
if the concentration of ${\text{OH}}^{-}$ions is decreased by $1/4$ times, then the equilibrium concentration of ${\text{Fe}}^{3+}$ will increase by

Topic: JEE PYQ

Answer: C. Full step-by-step solution below.