Friday, March 7, 2008



(First Year – Year-Wise Scheme)

Part III – Physical Sciences


Time : 3 Hours (English Version) Max.Marks: 60

Note :Read the following instructions carefully.

1) Answer ALL questions of Section-A. Answer any SIX questions from Section-B and any Two

Questions in Section-C.

2) In Section-A questions from Serial Nos. 1 to 10 are of “Very Short Answer type”. Each question

Carries Two marks. Every answer may be limited to 2 or 3sentences. Answer all these questions

At one place in the same order.

3) In Section-B questions from Serial Nos. 11 to 18 are of “Short Answer Type”. Every question

Carries Four marks. Every answer may be limited to 75 words.

4) In Section-C questions from Serial Nos. 19 to 21 of Long Answer Type”. Each question carries

Eight marks. Every answer may be limited to 300 words.

5) Draw labelled diagrams wherever necessary for questions in Section in Sections B and C


Answer ALL questions.

1.Calculate the wave number of radiation with wavelength 4000 A0.

2.What is Lanthanide contraction?

3.In H2O and HF which has higher boiling point? Why?

4.Calculate the volume occupied by 2.5 moles of CO2 at STP.

5.What is Deuterolysis? Give example.

6.What is tha stable number of Lead? Why?

7.Why do helium and neon cannot form clathrate compounds?

8.Write the hybridization and shape of the XeO3 molecule.

9.Define COD and BOD.

10.What are the effects of acid rains?


Attempt any SIX questions:

11.A flask contains 1 gm of hydrogen, 2 gm of neon and 1.6 gms of oxygen at a pressure of 2 atm. At

270C. Calculate the partial pressures of each gas and the volume of the flask.

12.Deduce a)Boyle’s law

b)Graham’s law from kinetic gas equation.

13.Balance the following Redox reaction by ion-electron method in acid medium.

H2SO4 + HBr --------à SO2 + Br2

14.Write two oxidising and two reducing properties of hydrogen peroxide.

15.Write two methods of preparation of ethane. Write the reactions of ethane.

16.What is Ozonolysis? Explain with examples.

17.Explain the purification of Bauxite by Bayer’s process with equations.

18.Explain the extractions of sodium metal by Down’s process.


Attempt any TWO questions

19.State the important postulates of Bohr’s theory. Based on the postulates, explain the formation of

Different lines in various series of hydrogen atomic spectrum with diagram.

20.What is periodic property? How do the following properties change in first group and third period?

a) Nature of oxides

b)Ionisation potential

c)Metalic and non-metalic properties

21.Define Crystal Lattice Energy. Describe energy changes in the formation of sodium chloride according

to Born-Haber cycle.

No comments: