Chemistry Class 12 NCERT Solutions: Chapter 9 Coordination Compounds Part 5

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Q: 11. Draw all the isomers (Geometrical and optical) of:

(i)

(ii)

(iii)

Answer:

(i)

Q 11 i Superimposable and Non Superimposable Mirror Images

Q 11 I Superimposable and Non Superimposable Mirror Images

Q 11 i Superimposable and Non Superimposable Mirror Images

In total, three isomers are possible.

(ii)

Q 11 ii Trans-Isomers are Optically Inactive

Q 11 Ii Trans-Isomers Are Optically Inactive

Q 11 ii Trans-Isomers are Optically Inactive

Trans-isomers are optically inactive.

isomers are optically active

(iii)

Q 11 iii The Isomers Geometrical and Optical

Q 11 Iii the Isomers Geometrical and Optical

Q 11 iii The Isomers Geometrical and Optical

Q: 12. Write all the geometrical isomers of and how many of these will exhibit optical isomers?

Answer:

Q 12 The Geometrical Isomers

Q 12 the Geometrical Isomers

Q 12 The Geometrical Isomers

From the above isomers, none will exhibit optical isomers. Tetrahedral complexes rarely show optical isomerization. They do so only in the presence of unsymmetrical chelating agents.

Q: 13. Aqueous copper sulphate solution (blue in colour) gives:

(i) A green precipitate with aqueous potassium fluoride, and

(ii) A bright green solution with aqueous potassium chloride

Explain these experimental results.

Answer:

Aqueous exists as . It is blue in colour due to the presence of ions.

(i)When is added

(ii) When is added

In both these cases, the weak field ligand water is replaced by the and ions.

Q: 14. What is the coordination entity formed when excess of aqueous is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when is passed through this solution?

Answer:

i.e.,

Thus, the coordination entity formed in the process is . is a very stable complex, which does not ionize to give ions when added to water. Hence, ions are not precipitated when is passed through the solution.