$\begin{array}{1 1} \text{(a) A reddish brown colloidal solution of} \;Fe(OH_{2})_{3} \\ \text{ (b) A bluish colloidal solution of}\;Fecl_{3} \\ \text{(c) A reddish brown colloidal solution of}\;Fe(OH)_{3} \\ (d) \text{A brown solution of} \;Fe_{2}(OH)_{3} \end{array}$