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  •  Which complex compound is most stable?Option: 1 <img alt="\left.\left[\mathrm{Co}\left(\mathrm{NH}_3\right)\right)_4\left(\mathrm{H}_2 \mathrm{

 Which complex compound is most stable?

Option: 1

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


Option: 2

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


Option: 3

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


Option: 4

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


Answers (1)

best_answer

We know,

\text { Stability }\propto \text{ Chelation }

So,  \left[\mathrm{CoCl}_2(\mathrm{en})_2\right] \mathrm{NO}_3 has "en" ligand which provides chelation to the complex which makes it stable.

Correct option 3

Posted by

Rishi

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