Q43 / 180 · COMEDK 2020 · Chemistry

Which complex cannot ionise in solution?

  • A
    $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{4}$
  • B
    $\mathrm{K}_{2}\left[\mathrm{Pt}\left(\mathrm{F}_{6}\right)\right]$
  • C
    $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$
  • Correct answer
    D
    $\left[\mathrm{CoCl}_{3}\left(\mathrm{NH}_{3}\right)_{3}\right]$

Solution

The complex $\left[\mathrm{CoCl}_{3}\left(\mathrm{NH}_{3}\right)_{3}\right]$ cannot ionise in the solution as there is no primary valency in this compound and all the ions are within the coordination entity.

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

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