Class 12
Question paper
COORDINATON
COMPOUNDS AND ORGANOMETALLICS
1.
Write the IUPAC names of the
following compounds
[Co(NH3)6]Cl3,
K3[Fe(C2O4)3],
K[PtCl3(NH3)], Na2[CrOF4], [CoCl2(en)2]SO4,
Hg[Co(SCN)4], [Ni(CO4)],
[PtCl2(NH3)2],
[CoCl2(en)]SO4, [CoCl2(NH3)4]3[Cr(CN)6],
Li[AlH4], [Fe(C5H5)2],
[Ni(dmg)2], [Mn3(CO)12],
[(NH3)5Cr-OH-Cr(NH3)5]Cl5
2.
Which types ligands form
chelates?
3.
How many isomers are there for
the complex [Co(NH3)4Cl2]Cl ?
4.
Which isomer of [CoCl2(en)2]+
does not show optical isomerism ?
5.
A co-ordination compound has
the formula CoCl3.4NH3. It does not liberate ammonia but
precipitates chloride ions as silver chloride. Give the IUPAC name of the
complex and write its structural formula.
6.
Which of the compounds is more
stable and why?
7.
[NiCl4]2-
is paramagnetic while [Ni(CO)4] is diamagnetic though both are
tetrahedral. Why?
8.
[Co(CN)6]3- and
[CoF6]3- both are octahedral complexes. Then what is the difference
between the two?
9.
Account for the fact that
[Ni(CO)4] has tetrahedral geometry whereas [Ni(CN)4]2-
has square planar geometry.
10. Why Ligand Field Theory is also called Crystal Field Theory?
11. What is Crystal
12. Draw isomers of the complex ion [Co(en)2Cl2]+
13. Using th valence bond theory, predict the geometry and magnetic
character of
(i) [NiCl4]2- (ii) [Ni(CO)4] (At. No.
of Ni = 28)
Hint. (i) sp3
hybridization-tetrahedral, two unpaired electrons-paramagnetic.
14. How coordination sites are there in ethylene diamine CH2NH2
?
|
CH2NH2
15. Write the formula of tetrachlorocuprate (II) ion.
16. What are tetrabutyl tin prepared?
17. Name the ionisarion isomer of [Cr(H2O)Br]SO4
18. Predict the number of different types of isomers for the following
complex :
(i) [Pt (NH3)3Br]NO2 (ii) [Cr(ox)3]3-
(iii) [Co(en)2Cl2]+ (iv) [Pt(NH3)4][PtCl]4]
19. Which of the following exhibit geometrical isomers :
(a) [Co(en)2Cl2]+ (b) [Pt(Nh3)3Cl]
(c ) Tetrahedral [Co(NH3)2BrCl] (d) [Rh(NH3)3Cl3]
20. Write the formula of the following :
(i)
Linkage isomer of [CoCl (NO2)(en)2]Cl2
(ii)
Coordination isomer of [Co(NH3)6][Cr(NO2)6]
(iii)
Ionisation isomer of [CoCl (NO2)(en)2]Cl
21. Give one example of hexadentate ligand.
22. What is linkage isomerism? Give one example.
23. What is chelate? Give one example.
24. Give the example of an organometallic compound that is used as a
homogeneous catalyst.
25. Write the formula of the complex ion chloronitrotetrammine cobalt
(III) and identify ligand, coordinate number and coordinate sphere in this
complex. How many ions per mole would be given by this complex in solution?
26. Write the formula for
(i) Zeise
salt (ii) Ferrocene (iii) Trimethyl aluminium
27. How many geometrical isomers of [Cr(en)2Cl2]+ axist?
Which of these show optical activity?
28. Ni(CO)4 has tetrahedral geometry while [Pt(NH3)2Cl2]is
square planar.
29. Account for the non-ionic nature of the complex CoCl3.3NH3.
30. Write the formula of the following complexes:
(a)
Diamminechloroethylenediaminenitro-platinum(IV)
chloride
(b)
Calcium hexacyanoferrate (II)
(c)
Tetracarbonylnickel (0)
(d)
Iron hexacyanoferrate (II)
(e)
Hexaaquonickel (II) perchlorate
(f)
Dichlorobis (ethylenediaamine)
cobalt (III) sulphate.
31. What is spectrochemical series? Explain the difference between a
week field ligand and a strong field ligand.
32. How many geometrical and optical isomers are possible for the
complex ion, [Co(en)2Cl2]+?
33. Write the formula of the following complex:
(i)
Pentaamminechlorocobalt (III)
ion
(ii)
Lithium tetrahydroaluminate
(III)
34. Explain how [Pt (NH3)2Cl2] and
[Pt(NH3)6]Cl4 differ in their electrolytic
conductance?
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