Chemistry Coordination Compounds

Stability constant of complex = $\frac{1}{dissocationconstant}$  

$\therefore$ Dissociation constant = $\frac{1}{2.1*10^{13}}=4.76*10^{-14}$  

the nearest value of dissociation constant = 5 * 10^-14

Ans. = 5

${\left[Fe{\left(CN\right)}_{5}NOS\right]}^{4-}$  ${{}_{}}^{}$ Violet colour

${{}_{}}^{}$  ${\left[Fe{\left(SCN\right)}_6\right]}^{4-}$ Blood red colour

$$ $F{e}_4{\left[Fe{\left(CN\right)}_6\right]}_3{H}_{2}O\to$  Prussian blue colour

$$ ${\left[Fe{\left(CN\right)}_6\right]}^{4-}\to$  Yellow colour

$\left[Co{\left(N{H}_3\right)}_3{\left(N{O}_2\right)}_3\right]$ shows Facial and Meridional geometrical isomerism.

$\left[CoC{l}_2{\left(en\right)}_2\right]$ shows cis and trans geometrical isomerism.

${\left[Co{\left(N{H}_3\right)}_{4}C{l}_2\right]}^{+}$  shows cis and trans geometrical isomerism.

${\left[Co{\left(CN\right)}_5\left(NC\right)\right]}^{3-}$ can not show geometrical isomerism.

CFSE $\propto$ strength of ligand           

And order of strength of ligand is

en > NH₃ > H₂O > F^-

FeCl₃. 3H₂O i.e. [Fe(H₂O)₃], K₃[Fe(CN]₆ and [Co(NH₃)₆]Cl₃; the last two complex are inner-orbital complex due to presence of strong ligand.

$\therefore {\Delta }_{0}of{K}_3\left[Fe{\left(CN\right)}_6\right]>{\Delta }_{0}of\left[Co{\left(N{H}_3\right)}_6\right]C{l}_3$       

Because CN^- is strong ligand

$\therefore {\Delta }_0\propto \frac{1}{\lambda }$         

More ${\Delta }_0$  smaller value of absorbed $\lambda$ .

$K_3\left[Fe{\left(CN\right)}_6\right]\to F{e}^{+3}=4s^{0}3d^{5}4p^0$       

$\therefore u.e=1$      

$\therefore \mu =\sqrt[]{1*\left(1+2\right)}B.M=\sqrt[]{3}B.M$        

= 1.732 B.M

$\approx$ 2

the lowest spin only magnetic moment for Ni⁺² because of minimum unpaired electron.

Complex is   $\left[Co{\left(N{H}_3\right)}_{4}C{l}_2\right]Cl$

Primary valency = No. of ionisable species = 1

Stronger ligand will produce more ${\Delta }_0$ . so energy absorbed will be of greater extent.

Among all CO³⁺ has the highest +ve charge density and CN^- is the strongest ligand among all which will give maximum CFSE.

In strong ligand field  ${\mathrm{C}\mathrm{o}}^{3+}$ will have ${\mathrm{t}}_{2\mathrm{g}}^6{\mathrm{e}}_{\mathrm{g}}^0$ of configuration and $\mathrm{\Delta }\mathrm{t}=\frac{4}{9}{\mathrm{\Delta }}_0$