JEE Main 2025 — 2 April, Morning Shift — Question 14

Choose the correct tests with respective observations.

(A) $\mathrm{CuSO}_{4}$ (acidified with acetic acid) + $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \rightarrow$ Chocolate brown precipitate.

(B) $\mathrm{FeCl}_{3}+\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \rightarrow$ Prussian blue precipitate.

(C) $\mathrm{ZnCl}_{2}+\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$, neutralised with $\mathrm{NH}_{4} \mathrm{OH}$ $\rightarrow$ White or bluish white precipitate.

(D) $\mathrm{MgCl}_{2}+\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \rightarrow$ Blue precipitate.

(E) $\mathrm{BaCl}_{2}+\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$, neutralised with $\mathrm{NaOH} \rightarrow$ White precipitate.

Choose the correct answer from the options given below :