Which among the following doesn't form a white precipitate with $\mathrm{AgNO}_3$ solution?

Which among the following doesn't form a white precipitate with $\mathrm{AgNO}_3$ solution?
  1. $\left[\mathrm{Co}\left(\mathrm{NH}_3ight)_6ight] \mathrm{Cl}_3$
  2. $\left[\mathrm{Co}\left(\mathrm{NH}_3ight)_5 \mathrm{Cl}ight] \mathrm{Cl}_2$
  3. $\left[\mathrm{Co}\left(\mathrm{NH}_3ight)_4 \mathrm{Cl}_2ight] \mathrm{Cl}_2$
  4. $\left[\mathrm{Co}\left(\mathrm{NH}_3ight)_3 \mathrm{Cl}_3ight]$

Solution

The $\left[\mathrm{CoCl}_3\left(\mathrm{NH}_3ight)_3ight]$ complex contains elements of symmetry and is optically inactive. It does not give white precipitate with silver nitrate solution as chlorine is present in coordination sphere.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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