JEE Main 2025 — Practical Chemistry Question with Solution

Choose the correct tests with respective observations.
(A) ${\mathrm{CuSO}}_4$ (acidified with acetic acid) $+{\mathrm{K}}_4\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]\to$ Chocolate brown precipitate.
(B) ${\mathrm{FeCl}}_3+{\mathrm{K}}_4\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]\to$ Prussian blue precipitate.
(C) ${\mathrm{ZnCl}}_2+{\mathrm{K}}_4\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]$, neutralised with ${\mathrm{NH}}_4\mathrm{OH}$ $\to$ White or bluish white precipitate.
(D) ${\mathrm{MgCl}}_2+{\mathrm{K}}_4\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]\to$ Blue precipitate.
(E) ${\mathrm{BaCl}}_2+{\mathrm{K}}_4\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]$, neutralised with NaOH $\to$ White precipitate.
Choose the correct answer from the options given below :