Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Coordination Compounds

One Word Answers

161. Using IUPAC norms write the systematic name of the following:
[Ni(NH₃)₆]Cl₂

260 Views

162. Using IUPAC norms write the systematic name of the following:
[Co(en)₃]³⁺

139 Views

163. Using IUPAC norms write the systematic name of the following:
[Ni(CO)₄]

141 Views

Long Answer Type

164.
List various types of isomerism possible for coordination compounds, giving an example of each.

(i) Ionisation isomerism: This type of isomerism occurs when there is an interchange of groups between the co-ordination sphere of the metal ion and ions outside this sphere, e.g.,

\underset{Bromopenta - amine cobalt (III) sulphate (violet)}{{[Co ({NH}_{3})_{5} Br]}^{2 +} {SO}_{4}^{2 -}} \underset{Sulphatopenta - amine cobalt (III) bromide (red)}{{[Co ({NH}_{3})_{5} {SO}_{4}]}^{+} {Br}^{-}}

are ionisation isomers.

(ii) Coordination isomerism: This type of isomerism occurs when both the cation and anion are complexes and they differ in the coordination of ligands, e.g., [Co(NH₃)₆][Cr(C₂O₄)₃] and [Cr(NH₃)₆] [Co(C₂O₄)₃] are coordination isomers.

(iii) Linkage isomerism: The isomerism in which a ligand can form linkage with metal through different atoms, e.g., nitro group can link to metal either through nitrogen (–NO₂) or through oxygen atom, e.g.,

\underset{Nitritopenta - amine cobalt (III) chloride}{[Co ({NH}_{3})_{5} ONO] {Cl}_{2}}

and

\underset{Nitropenta - amine cobalt (III) chloride}{[Co ({NH}_{3})_{5} {NO}_{2}] {Cl}_{2}}

are linkage isomers.

(iv) Geometrical isomerism: In tetra coordinated square planar complexes, cis- (when same groups are on same side and trans- (when same groups are on opposite sides) isomers are possible depending on position of different ligands, e.g., cis-platin and trans-diamine dichloro platinum(II).

Fig. Geometrical isomerism.

(v) Optical isomerism: Optical isomers are those which are not superimposable on their mirror images. Complexes with coordination number six, having bidentate ligands provide examples of optical isomerism, e.g.,

Fig. Optical isomerism.