Guru Nanak Dev University 2005 B.Sc Chemistry INORGANIC (Chem-201) 2k5 - Question Paper
B.Sc (H.S.) in Chemistry second Semester
2045
Chem - 201
INORGANIC CHEMISTRY
Time Allowed : three hours
Maximum Marks : 75
part - A
Note : All parts of ques. one are Compulsory. every part carries 1½ marks.
1)
i) Differentiate ranging from ortho and para hydrogen.
ii) discuss the effect of polarization on the decomposition of metal carbonates.
iii) Why does the chemical reactivity of metals increase from Li to Cs ?
iv) discuss giving reasons why NaOH is stronger than Ba(OH)2.
v) Refer attachment
vi) Acidic character of dioxides of Group-IV elements reduces as we move down the group.
vii) Nitrogen molecule is diatomic, but phosphorous molecule is tetra atomic. discuss.
viii) Refer attachment.
ix) What happens when bromine oxide dissolves in sodium trifluoride ?
x) Compare the buoyancy of helium with that of hydrogen.
part - B
Note : Attempt any 8 ques.. every ques. carries 4½ marks.
2. There is a distinct participation of d-orbitals in pi bonding in heavier p-block elements. Illustrate this statement.
3. provide a brief account of the oxides and hydroxides of alkalene metals. Comment on the structure of oxides also.
4. (a) Draw and discuss the structure of calcium carbide and chlorophyll 'a'. (3)
(b) Nitrogen has no pentahalides unlike phosphorous. discuss. (1½)
5. define briefly the preparation and properties of Borax.
6. refer to attachment
7. define briefly complexes of alkali metals with polydentate ligands.
8. Write short note on Silicones.
9. Refer attachment.
10. (a) What is 'curse' of inert pair effect ? (2½)
(b) discuss the factors which favour catenation (2)
11. discuss the structure of oxyacids of phosphorous.
12. (a) Compare and discuss the relative tendancies of lanthanides and actinides to form complexes. (2½)
(b) discuss briefly chemistry involved in the separation of lanthanides. (2)
13. (a) elaborate actinides ? provide their electronic configurations (2½)
(b) define briefly oxidation states of Group XII (zinc, cadmium, mercury group) elements. (2)
part - C
Note Attempt any 2 ques.. every ques. carries 12 marks.
14. refer attachment.
15. refer attachment.
16. refer attachment.
17. refer attachment
Section A
1)
v) Aluminium forms [Al(OH)6]3- but [B(OH)6]3- is not known. Explain
viii) The formula of telluric acid is Te(OH)6. Explain as to why the analogous sulphuric acid S(OH)6 does not exist.
Section B
6. Explain the structure of XeO3 and ICl2-.
9. On the basis of back bonding, explain why BF3 is a weak Lewis acid than BCl3.
Section C
14. (a) What are phosphazenes? How are they prepared? Discuss the structure of hexachlorocyclophosphazene (NPCl2)3 .
(b) Discuss the electropositive character of iodine. (6,6)
15. (a) Discuss the method of preparation, properties and structure of XeF6 and
XeO2F2.
(b) Describe briefly the preparation of boron hydrides and structure of boranes. (6,6)
16. Explain briefly the following :
(a) Clathrates of Noble gases
(b) Chemistry and structure of Cl2O6
(c) Preparation, properties and structure of N2O and NO2. (4,4,4)
17. (a) Describe the preparation, properties and structure of Boron Nitride (BN).
(b) Explain the difference in structure between CaH2 and BeH2.
(c) Write a note on the diagonal relationships among certain elements. (6,3,3)
| Earning: Approval pending. |
