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

B.Sc. Chemistry, 1st Year DEGREE EXAMINATION, DECEMBER 2006
Paper I - CHEMISTRY

Time : 3 hours Maximum : 100 marks

PART A - (4 X 15 = 60 marks)
ans ALL ques..

1. (a) What is atomic/ionic radius of elements? discuss in how many ways it is determined.

(b) describe Ionization potential. Why 2nd ionization potential of an element is always greater than its 1st ionization potential?

(c) elaborate the factors effecting ionization potential?

Or

(d) elaborate carbides? How are they classified? provide examples.


(e) explain the structures of XeO3 and XeOF2.

(f) Write any 5 oxy acids of sulphur along with their structures.

2. (a) provide reasons for the following:
(i) Alcohols are neutral where as phenols are acidic compounds.
(ii) Formic acid is stronger than Acetic acid.

(b) explain the mechanism of free radicle substitution of chlorination of methane.

(c) What is bond fission? discuss the species formed on bond fissions in organic molecules.
provide examples.

Or

(d) discuss the orientation of aromatic substitution reaction of Benzene.

(e). explain structure and bonding of Benzene ring.

(f) Write about 1,4-addition reaction takes place in conjugated dienes.

3. (a) Derive the relation ranging from elevation of boiling point and the molecular weight of solute.

(b) The molal elevation constant of water is 0.54 kg-mol-1. compute the boiling point of solution containing six grams of Urea in 100 grams of water (mol. wt. of Urea = 60).

(c) What is vant Hoff’s factor? Write its significance.

Or

(d) describe critical constants. discuss the Andrew’s isotherms of carbondioxide.

(e) What is coagulation and peptization of colloids? discuss the gold number.

(f) What is meant by p-type and n-type semiconductors?

4. (a) elaborate molecular orbitals? Write the criteria of formation of various kinds of molecular orbitals.

(b) Construct MOED of N2 molecule.

(c). Write the molecular electronic configuration of CO and NO molecules. Compare their magnetic properties.

Or

(d) Write the principles involved in the detection of end point in redox titrations.

(e) describe Co-precipitation and post-precipitations take place in gravimetric analysis. How are they prevented?

(f) Write a short notes on titration curves.

PART B - (8 X five = 40 marks)
ans any 8 of the following:

5. elaborate hydrides? How are they classified? provide examples.

6. Write about the general methods of preparation of silicones.

7. discuss the following:
(a) Diagonal relationship
(b) Structure of Boron nitride.

8. discuss with an example the mechanism of nucleophilic substitution reaction.

9. What is ozonolysis reaction? elaborate its applications?

10. Write any 2 general methods of preparation of cycloalkanes.

11. elaborate emulsions and emulsifiers? discuss with suitable examples.

12. What is osmotic pressure? discuss the determination of osmatic pressure by Berkeley-Hartley’s method.

13. discuss the following:
(a) Miller indices
(b) Inversion temperature.

14. What is Blackbody? How does Max Planck’s radiation theory discuss the behaviour of Black body?

15. What is experimental error? discuss in how many ways experimental errors are expressed.

16. elaborate metallochrome indicators? How they are useful in complexometric titrations?

Earning:   Approval pending.