Download App

Coordination Compounds — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds5 Marks
Question
What is meant by stability of a coordination compound in solution? State the factors which govern stability of complexes.
✓

Answer

The stability of a complex in a solution refers to the degree of association between the two species involved in a state of equilibrium. Stability can be expressed quantitatively in terms of stability constant or formation constant.

$\text{M}+3\text{L}\leftarrow\rightarrow\text{ML}_{3}$

Stability constant, $\beta=\frac{[\text{ML}_{3}]}{[\text{M}][\text{L}]^{3}}$

For this reaction, the greater the value of the stability constant, the greater is the proportion of ML3 in the solution.

Stability can be of two types:

  1. Thermodynamic stability:

The extent to which the complex will be formed or will be transformed into another species at the point of equilibrium is determined by thermodynamic stability.

  1. Kinetic stability:

This helps in determining the speed with which the transformation will occur to attain the state of equilibrium.

Factors that affect the stability of a complex are:

  1. Charge on the central metal ion: Thegreater the charge on the central metal ion, the greater is the stability of the complex.

  2. Basic nature of the ligand: A more basic ligand will form a more stable complex.

  3. Presence of chelate rings: Chelation increases the stability of complexes.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "5 Marks Questions" from Coordination Compounds→Coordination Compounds — all question types→Chemistry STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Match the items of Column I and Column II.
 
Column I
 
Column II
i.
Lead storage battery
a.
Maximum efficiency.
ii.
Mercury cell
b.
Prevented by galvanisation.
iii.
Fuel cell
c.
Gives steady potential.
iv.
Rusting
d.
Pb is anode, PbO2 is cathode.
→
Prove that the relative depression of vapour pressure is equal to the mole fraction of solute.
→
Describe the nucleophilic addition- elimination reactions of carbonyl compounds with reference to their reaction with the following compounds:
(i) Alcohol and thio alcohol
(ii) Ammonia and its derivatives
→
Match the items of Column I and Column II on the basis of data given below:
$\text{E}^{\ominus}_{\text{F}_2/\text{F}^-}=2.87\text{V},\text{ E}^{\ominus}_{\text{Li}^+/\text{Li}}=-3.5\text{V},\text {E}^{\ominus}_{\text{Au}^{3+}/\text{Au}}=1.4\text{V},\text{ E}^{\ominus}_{ \text{Br}_2/\text{Br}^-}=1.09\text{V}$
 
Column I
 
Column II
i.
F2
a.
Metal is the strongest reducing agent.
ii.
Li
b.
Metal ion which is the weakest oxidising agent.
iii.
Au3+
c.
Non metal which is the best oxidising agent.
iv.
Br-
d.
Unreactive metal.
v.
Au
e.
Anion that can be oxidised by Au3+
vi.
Li+
f.
Anion which is the weakest reducing agent.
vii.
F-
g.
Metal ion which is an oxidising agent.
→
  1. State Raoult’s law for a solution containing volatile components.

 How does Raoult’s law become a special case of Henry’s law?

  1. 1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. Find the molar mass of the solute. (Kf for benzene= 5.12 kg mol-1).
→
Match the items of Column I and Column II.
  Column I   Column II
(i) Mathematical expression for rate of reaction. (a) Rate constant.
(ii) Rate of reaction for zero order reaction is equal to. (b) Rate law.
(iii) Units of rate constant for zero order reaction is same as that of. (c) Oder of slowest step.
(iv) Order of a complex reaction is determined by. (d) Rate of a reaction.
→
A voltaic cell is set up at 25°C with the followinng half-cell:
Al | Al3+ (0.001M) and Ni | Ni2+ (0.50M)
Calculate the cell voltage $\text{E}^{\circ}_{\text{Ni}^{2+}/\text{Ni}}\Big[=-0.25\text{V,E}^{\circ}_{\text{Al}^{3+}/\text{Al}}=-1.66\text{V}\Big]$
→
Magnetic properties of coordination compounds. Explain in detail.
→
Answer the following question:
g of benzoic acid (C6H5COOH) dissolved in 25g of benzene shows a depression in freezing point equal to 1.62K. Molal depression constant for benzene is 4.9K kg mol-1. What is the percentage association of acid if it forms dimer in solution?
→
Explain primary, secondary and tertiary structure of proteins with diagram.
→