Chemistry - Salt Analysis Question with Solution | TestHub

The question asks to identify the reaction that does NOT produce a red precipitate or solution.

A. $\mathrm{FeC}{\mathrm{l}}_3$ (neutral sol.) + $\mathrm{C}{\mathrm{H}}_3\mathrm{CO}{\mathrm{O}}^{-}\to$

This reaction forms blood-red ferric acetate complex, $[\mathrm{F}{\mathrm{e}}_3(\mathrm{OH}{)}_2(\mathrm{C}{\mathrm{H}}_3\mathrm{COO}{)}_6{]}^{+}$.

B. $2\mathrm{Cu}(\mathrm{N}{\mathrm{O}}_3{)}_2+{\mathrm{K}}_4[\mathrm{Fe}(\mathrm{CN}{)}_6]\to \mathrm{C}{\mathrm{u}}_2[\mathrm{Fe}(\mathrm{CN}{)}_6]+4\mathrm{KN}{\mathrm{O}}_3$

This reaction forms a reddish-brown precipitate of copper(II) ferrocyanide, $\mathrm{C}{\mathrm{u}}_2[\mathrm{Fe}(\mathrm{CN}{)}_6]$.

C. $\mathrm{Hg}(\mathrm{N}{\mathrm{O}}_3{)}_2+\mathrm{KI}$ (aq. sol.) $\to \mathrm{Hg}{\mathrm{I}}_2+2\mathrm{KN}{\mathrm{O}}_3$

This reaction forms a scarlet red precipitate of mercury(II) iodide, $\mathrm{Hg}{\mathrm{I}}_2$.

D. $\mathrm{AgN}{\mathrm{O}}_3$ sol. + ${\mathrm{K}}_2\mathrm{Cr}{\mathrm{O}}_4\to \mathrm{A}{\mathrm{g}}_2\mathrm{Cr}{\mathrm{O}}_4+2\mathrm{KN}{\mathrm{O}}_3$

This reaction forms a brick-red precipitate of silver chromate, $\mathrm{A}{\mathrm{g}}_2\mathrm{Cr}{\mathrm{O}}_4$.

All options A, C, and D produce a red-colored product. Option B produces a reddish-brown precipitate, which is distinct from a red color. Therefore, option B is the correct answer.

The final answer is $\boxed{B}$