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$\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$ is used in detecting.
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Verified Answer
The correct answer is:
$\mathrm{Fe}^{3+} \mathrm{ion}$
$\mathrm{Fe}^{3+}$ ion can be detected by $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
$$
\begin{aligned}
4 \mathrm{Fe}^{3+}+3 \mathrm{~K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \\
& \longrightarrow \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}+12 \mathrm{~K}^{+}
\end{aligned}
$$
$$
\begin{aligned}
4 \mathrm{Fe}^{3+}+3 \mathrm{~K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \\
& \longrightarrow \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}+12 \mathrm{~K}^{+}
\end{aligned}
$$
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