For the given aqueous reactions, which of the statement(s) is / are true?

Excess

$$\begin{gathered} \mathrm{KI}+{\mathrm{K}}_3\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]\stackrel{\text{ dil. }{\mathrm{H}}_2{\mathrm{SO}}_4}{\to } \mathrm{Brownish}-\mathrm{yellow} \mathrm{solution} \\ \downarrow {\mathrm{ZnSO}}_4 \\ \text{ White ppt. }+\text{ Brownish-yellow filtrate } \\ \downarrow {\mathrm{Na}}_2{\mathrm{s}}_2{\mathrm{O}}_3 \\ \mathrm{Colourless} \mathrm{solution} \end{gathered}$$