Acharya Nagarjuna University (ANU) 2006 B.Sc Chemistry - Question Paper

B.Sc. DEGREE EXAMINATION, MAY 2006.
(Examination at the end of 1st Year)
Part II - Chemistry
Paper I - CHEMISTRY

Time : 3 hours Maximum : 100 marks

part A - (4 x 15 = 60 marks)
ans ALL ques.

1. (a) describe Electronegativity. How it is determined by Pauling's method.

(b) elaborate the factors affecting the magnitude of Electronegativity ?

(c) Write any 2 applications of electronegativity in predicting and explaining nature of chemical bond.

Or

(d) elaborate interhalogen compounds ? How are they classified based on their structures ? provide examples.

(e) discuss the structures of the subsequent.

(i) I3 (ii) ICI4

(f) Write about the basic characters of Iodine.

2. (a) What is Huckel's rule of aromaticity ? How it is applicable to Benzene and cyclo propenylcation ?

(b) describe Inductive effect. discuss why ammonia is more basic than Aniline and less basic than ethyl amine.

(c) Write Diel's-Alder's reaction with an example.

Or

(d) discuss why Toluene is more reactive than benzene and nitrobenzene is less reactive in electrophyllic substitution reactions.

(e) Why tertiary butyl carbonium ion is more stable than isopropyl carbonium ion ?

(f) Write and discuss Zaitsev's rule for elimination reactions of alkyl halides.

3. (a) State Raoult's legal regulations of dilute solutions. Derive an formula to determine molecular weight of a non volatile solute from lowering of vapour pressure.

(b) At 270C the vapour pressure of benzene is 720 mmHg. It is lowered to 702 mmHg on
dissolving five gms of a non volatile solute in 100 gms of benzene. Determine the molecular weight of solute.

(c) Derive Brag's formula.

(d) Write the differences ranging from physisorption and chemisorption.

(e) discuss FREUNDLICH isothermic legal regulations of adsorption.

(f) provide an account on applications of adsorption.

4. (a) define LCAO approximation of the formation of molecular orbitals.

(b) discuss the paramagnetic nature of Boron (B2) molecule through MOED.

(c) On the basis of MOT, prove that Helium (He2) molecule does not exist

Or

(d) elaborate neutralization indicators ? provide 2 examples.

(e) discuss the principle involved in the selection of a suitable indicator in various neutralization reactions.

(f) What is coprecipitation ? Write the various kinds of coprecipitations possible in the
precipitation reactions.

part - B (8 x five = 40 marks)
ans any 8 of the subsequent.

5. discuss the Lewis acidic nature of Boron Trihalides.

6. elaborate metal carbonyls ? discuss the structure and bonding in Fe(CO)5

7. Write a short note on oxyacids of chlorine.

8. Write the mechanism of additon of HBr to propene under various conditions.

9. How does Sache-Mohr theory discuss the stability of cyclohexane.

10. Write about Friendel Craft's alkylation and acylation reactions of benzene.

11. Why real gases deviate from ideal behaviour ? How it is discussed by van der Waal's formula ?

12. discuss the subsequent :

(a) Vant Hoff's factor

(b) Joule-Thomson effect.

13. Write about Frankel and Schottky defects in crystals.

14. State and discuss Heisenberg's uncertainty principle.

15. What is Accuracy and Precision of experimental outcomes. discuss.

16. discuss the subsequent :

(a) Significant figures

(b) Post precipitation.

Earning:   Approval pending.