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Coordination Compounds

Multiple Choice Questions

401.

Which of the following complexes has lowest molar conductance?

${CoCl}_{3} \cdot 3 {NH}_{3}$
${CoCl}_{3} \cdot 4 {NH}_{3}$
${CoCl}_{3} \cdot 5 {NH}_{3}$
${CoCl}_{3} \cdot 6 {NH}_{3}$

402.

Select the diamagnetic complex ion amongst the following complexes (At. no. : Fe = 26,CO = 27)

K₃[Fe(CN)₆]
[Co(NH₃)₆)Cl₃
K₃[FeF₆]
K₃[CoF₆]

403.

The correct charge on and co-ordination number of 'Fe' in K₃[Fe(CN)₆] is

+2, 4
+3, 6
+2, 6
+3, 3

404.

Which of the following co-ordinate complexes is an exception to EAN rule? (Given, atomic number Pt = 78, Fe = 26, Zn = 30, Cu = 29)

[Pt(NH₃)₆]⁴⁺
[Fe(CN)₆]^4-
[Zn(NH₃)₄]²⁺
[Cu(NH₃)₄]²⁺

405.
Consider the following two complex ions : [CoF₆]^3- and [Co(C₂O₄)₃]^3-. Which of the following statement(s) is/are false?
I. Both are octahedral.
II. [Co(C₂O₄)₃]^3- is diamagnetic while [CoF₆]^3- is paramagnetic.
III. Both are outer orbital complexes.
IV. In both the complexes, the central metal is in the same oxidation state.

Both II and III

II, III and IV

Only III

Both III and IV

Only III

Among all the given statements, statement III is false.

In both the given complexes, the central metal is in the same oxidation state, i.e. +3. [CoF₆]^3- due to weak ligand (F) does not go for pairing and show outer octahedral orbital complex (sp³d²). As it has five unpaired electrons, therefore, it is paramagnetic in nature.

While [Co(C₂O₄)₃]^3- due to strong bidentate ligand, go for pairing and forms inner octahedral orbital complex (d²sp³). As it does not have any unpaired electrons, therefore, it is diamagnetic in nature.