Chemistry · Practical Inorganic chemistry (Qualitative Analysis)

JEE Main 2025 — 24 January, Morning Shift — Question 45

Among the following cations, the number of cations which will give characteristic precipitate in

their identification tests with $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$ is :

$\mathrm{Cu}^{2+}, \mathrm{Fe}^{3+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{NH}_{4}^{+}, \mathrm{Mg}^{2+}, \mathrm{Zn}^{2+}$

Answer: 3

Numerical answer — enter this value.

Only $\mathrm{Cu}^{2+}, \mathrm{Fe}^{3+}, \mathrm{Ca}^{2+} \& \mathrm{Zn}^{2+}$ form precipitate with

$\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$

Answer key and solution verified before publishing.

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