PYQ NEET- Coordinate Compounds L-5

Question: Which complex compound is most stable?#

A) $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3\left(\mathrm{NO}_3\right)_3\right]$

B) $\left[\mathrm{CoCl}_2(\mathrm{en})_2\right] \mathrm{NO}_3$

C) $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]_2\left(\mathrm{SO}_4\right)_3$

D) $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\left(\mathrm{H}_2 \mathrm{O}\right) \mathrm{Br}\right]\left(\mathrm{NO}_3\right)_2$

Answer: $\left[\mathrm{CoCl}_2(\mathrm{en})_2\right] \mathrm{NO}_3$#