Guru Nanak Dev University 2006-3rd Sem B.Sc Chemistry CHEMICAL BONDING (Chem-301) (, 2k6) - Question Paper

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2126

B.Sc. (H.S) (Third Semester)

CHEMISTRY

Paper - Chem-301
(Chemical Bonding)

Time Allowed : three hours

Maximum Marks : 75

part - A

Note : Attempt ALL the ques. from this part. every ques. carries 1½ Marks.

1.

(i) Distinguish ranging from the subsequent :
(a) Hexagonal close packing and cubic close packing
(b) Tetrahederal and octahederal void.

(ii) provide the general characteristics of ionic and covalent bonds.

(iii) refer to attachment

(iv) discuss the subsequent terms with suitable examples:
(a) Schottky effect
(b) Fernel defect
(c) F-Centres

(v) discuss Ligand field Theory.

(vi) provide different factors affecting CFSE.

(vii) discuss hydration energy.

(viii) provide the importance of unit cell in crystal chemistry.

(ix) draw and define the structure of Nickel Arsenide.

(x) provide molecular orbital energy diagram of CO.

part - B
4½ every

2. provide the limiting radius ratio for different coordination numbers. provide examples of the kind of crystal structures associated with every coordination number.

3. define the variation of Bond angles on the basis of VSEPR theory.

4. In terms of bond theory, what is the difference ranging from :
(a) a conductor and an insulator.
(b) a conductor and a semi-conductor.

5. refer to attachment

6. discuss the term hybridization. provide the rules for otaining for hybrid orbitals.

7. define Nephelauxetic effect,

8. discuss electroneutrality principle.

9. provide the efficiency of packing in case of a metal crystal for :
(a) Simple cubic
(b) Body centered cubic.
(c) Face centered cubic.

10. provide different assumptions of valence bond theory.

11. define VSEPR rules.

12. provide limitations of Crystal Field Theory (CFT).

13. provide the imporyance of Spectrochemical series.

part - C

Note : Atempt any 2 ques. from this part.

14. Write short notes on :-
(a) Born - Haber cycle. (6)
(b) High temperature super conductors. (6)

15. provide a qualitative picture of molecular orbital energy level diagrams of octahederal, tetrahederal and square planar complexes. (12)

16. Using VSEPER theory, predict the structure of a few simple molecules. (12)

17. explain the applications of valence bond theory for the formation of coordination complexes. (12)

Earning:   Approval pending.