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Coordination Compounds

Short Answer Type

171. Draw all the isomers (geometrical and optical) of
[Co(NH₃)Cl(en)₂ ]²⁺

238 Views

172. Draw all the isomers (geometrical and optical) of
[Co(NH₃)₂Cl₂(en)]⁺

802 Views

173. Write all the geometrical isomers of[Pt(NH₃)(Br)Cl(py)] and how many of these will exhibit optical isomers?

655 Views

174. 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.

327 Views

175. What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H₂S(g) is passed through this solution?

Aqueous solution of copper sulphate contains Cu²⁺ ions in form of complex entity, [Cu(H₂O)₄]²⁺ and H₂O ligand is a weak ligand. When excess of KCN is added, a new coordination entity, [Cu(CN)₄]^2– is formed due to following reaction:

CuSO₄ (aq) + 4KCN → K₂[Cu(CN)₄] + K₂SO₄(aq)

{[Cu (H_{2} O)_{4}]}^{2 +} + \underset{(from aq . KCN)}{4 CN} \to \underset{(highly stable coordination entity)}{{[Cu (CN)_{4}]}^{2 -}} + 4 H_{2} O

Cyanide ligand CN^– is a strong field ligand and stability constant of [Cu(CN)₄]^2– is quite large and thus practically no Cu²⁺ ions are left in solution. Hence, no precipitate of copper sulphide is obtained when H₂S(g) is passed through solution.

549 Views

176.

Draw figure to show splitting of d orbitals in an octahedral crystal field.

276 Views

177.

What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand.

592 Views

178. Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory.
[Fe(CN)₆]^4–

447 Views

179. Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory.
[FeF₆]^3–

324 Views

180. Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory.
[CoF₆]^3–

329 Views

Previous Year Papers

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Test Yourself

Short Answer Type

175. What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H2S(g) is passed through this solution?

175. What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H₂S(g) is passed through this solution?