#### Coordination Chemistry Model Questions

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
10 x 1 = 10
1. The sum of primary valance and secondary valance of the metal M in the complex [M(en)2(Ox)]Cl isL

(a)

3

(b)

6

(c)

-3

(d)

9

2. A magnetic moment of 1.73BM will be shown by one among the following (NEET)

(a)

TiCl4

(b)

[CoCl6]4-

(c)

[Cu(NH3)4]2+

(d)

[Ni(CN)4]2-

3. How many geometrical isomers are possible for<<EVA035.eps>>?

(a)

3

(b)

4

(c)

0

(d)

15

4. Fac-mer isomerism is shown by

(a)

[CO(en)3]3+

(b)

[Co(NH3)4(Cl)2]+

(c)

[Co(NH3)3(Cl)3]

(d)

[Co(NH3)5Cl]SO4

5. Choose the correct statement

(a)

Square planar complexes are more stable than octahedral complexes

(b)

The spin only magnetic moment of [Cu(Cl)4]2- is BM and it has square planar structure.

(c)

Crystal field splitting energy $\left( { \Delta }_{ 0 } \right)$ [FeF6]4- is higher than the $(\Delta _{ 0 })$ $[Fe(CN)6]{ { 4 }^{ - } }$

(d)

crystal field stabilization energy of [V(H2O)6]2+ is higher than the crystal field stabilization of [Ti(H2O)6]2+

6. Primary and secondary valencies of Cu in [Cu(NH3)4]SO4 is

(a)

4,4

(b)

2,4

(c)

4,1

(d)

4,2

7. Which of the following octahedral complexes do not show geometrical isomerism?

(a)

[Co(NH3)3Cl3]

(b)

[PtCl2(NH3)4]

(c)

[Pt(NH3)2Cl2]

(d)

[Co(en)3]3+

8. IUPAC name of H2[Ptcl6] is

(a)

Hexa chloridoplatinum (IV) acid

(b)

Hexa chloridoplatinum (IV) acid

(c)

Hexachloridoplatinic (IV) acid

(d)

Dihydrogenhexaehloro platinate (IV)

9. The name of complex ion, [Fe(CN)6]3- is

(a)

Trieyanoferrate (III) ion

(b)

Hexacyano iron (III) ion

(c)

Hexacyanitoferrate (III) ion

(d)

Hexacyanido ferrate (III) ion

10. In Co-ordination compound. [Cr(en)3][CrF6

(a)

ligand is en (ethylenediamine)

(b)

Oxidation state of central atom is +3

(c)

Central metal is Cr (in anomie comples)

(d)

Cation complex is [Co(NH3)4Cl2]+

11. 5 x 2 = 10
12. Write the IUPAC names for the following complexes
i) Na2[Ni(EDTA)]
II) [Ag(CN)2)
iii) [Co9en)3]2(SO4)3
iv)[Co(ONO)(NH3)5]2+
v)[Pt(NH3)2Cl(NO2)]

13. Based on VB theory explain why [Cr(NH3)6]3+ is paramagnetic, while [Ni(CN)4]2- is diamagnetic.

14. Draw all possible geometrical isomers of the complex [Co(en)2]+ and identify the optically active isomer.

15. [Ti(H2O)6]3+ is coloured, while [Sc(H2O)6]3+ is colourless- explain

16. Write the IUPAC name of the complex.

17. 5 x 3 = 15
18. Give an example for complex of the type [Ma2b2c2] where a, b, c are monodentate ligands and give the possible isomers.

19. Write briefly about the applications of coordination compounds in volumetric analysis

20. Write the postulates of Werner’s theory

21. Why tetrahedral complexes do not exhibit geometrical isomerism

22. Draw the structure of the following homoleptic metal carbonyl.
(i) [Ni(CO)4]
(ii) [Fe(CO)5]
(iii) [Cr(CO)6]

23. 3 x 5 = 15
24. What is the coordination entity formed when excess of liquid ammonia is added to an aqueous solution copper sulphate?

25. Give the postulates and limitation of Werner's theory of co-ordination compounds.

26. Give the structure for the following compounds.
(i) pentaamminechlorocobalt (III) ion
(ii) Triamminetrinitrito- k N cobalt (III)
(ill) tetraammineaquabromidooobalt(III)nitrate
(iv) Dichloridobisethane-1 )2-diamine) cobalt (lIl) chloride
(v) Tetraamminecopper (lI)sulphate