One mole of the complex compound $\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}_3$, gives 3 moles of…

One mole of the complex compound $\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}_3$, gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of $\mathrm{AgNO}_3$ solution to yield two moles of $\mathrm{AgCl}$ (s). The structure of the complex is
  1. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right] \cdot 2 \mathrm{NH}_3$
  2. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{Cl} . \mathrm{NH}_3$
  3. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}\right] \mathrm{Cl}_2 . \mathrm{NH}_3$
  4. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2$

Solution

$\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}_3\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right]^{+2}+2 \mathrm{Cl}^{-}$ $\therefore$ Structure is $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2$.

Asked in: JEE Main 2003

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