Q58 / 180 · KCET 2007 · Chemistry

Which complex cannot ionise in solution?

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

Solution

$\left[\mathrm{CoCl}_{3}\left(\mathrm{NH}_{3}\right)_{3}\right]$ cannot ionise in solution because three chloride ions satisfy primary and secondary valencies. It will not be precipitated by the addition of $\mathrm{AgNO}_{3}$.

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

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