Q32 / 125 · BITSAT 2015 · Chemistry

$\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$ is used in detecting.

  • Correct answer
    A
    $\mathrm{Fe}^{3+} \mathrm{ion}$
  • B
    $\mathrm{Cu}^{+} \mathrm{ion}$
  • C
    $\mathrm{Cu}^{3+}$ ion
  • D
    $\mathrm{Fe}^{2+}$ ion

Solution

$\mathrm{Fe}^{3+}$ ion can be detected by $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$ $$ \begin{aligned} 4 \mathrm{Fe}^{3+}+3 \mathrm{~K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \\ & \longrightarrow \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}+12 \mathrm{~K}^{+} \end{aligned} $$

Hence, the correct answer is option: 'A'.

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