Practical & Analytical Chemistry · JEE Main previous year questions

2025 1 question

1. Q722025 · 24 Jan 2025 · Shift 1· Numerical answer

   Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with ${\mathrm{K}}_4[\mathrm{Fe}(\mathrm{CN}{)}_6]$ is ____. $\mathrm{C}{\mathrm{u}}^{2+},\mathrm{F}{\mathrm{e}}^{3+},\mathrm{B}{\mathrm{a}}^{2+},\mathrm{C}{\mathrm{a}}^{2+},\mathrm{N}{\mathrm{H}}_4^{+},\mathrm{M}{\mathrm{g}}^{2+},\mathrm{Z}{\mathrm{n}}^{2+}$

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   Answer: 4