Factors Affecting the Stability of Complexes MCQ

Solve by difficulty

The complex ion that will lose its crystal field stabilization energy upon oxidation of its metal to +3 state is:

$\left[\mathrm{Co}(\text { phen })_3\right]^{2+}$

$\left[Z n(\text { phen })_3\right]^{2+}$

$\left[F e(p h e n)_3\right]^{2+}$

$\left[N i(\text { phen })_3\right]^{2+}$

Which complex compound is most stable?

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

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

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

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

Concepts Covered - 1

Factors Affecting Stability of Complex Compound

Stability of complex compound $\propto$ oxidation state of central meta atom.
Stability of complex compound $\propto$ charge on central metal atom.
Stability of complex compound is inversely proportional to central metal atom.
Stability of complex compound $\propto$ electronegativity of central metal atom.
Stability of complex compound $\propto$ charge on ligands.
Stability of complex compound is inversely proportional to the size of ligands.
Chelating ligands which form 5-6 membered ring complex compound are far more stable than any other complex compound.