B.A. /B.Sc. (General) 2nd Semester
Chemistry
(Same for B.Sc. Microbial and Food Tech.)
Paper-VII:
Physical Chemistry-B
Time Allowed: Three Hours] [Maximum Marks: 22
Note: Attempt five questions in all, including Question No. IX which is compulsory and selecting one question from Units I, II, III and IV. You may use simple calculators.
UNIT-I
I. (a) What are Extensive and intensive properties? Explain.
(b) What are molar heat capacities at constant volume and constant pressure? How are they related?
(c) Derive expression for w, q, A E and A H for an ideal gas undergoing isothermal reversible expansion.
II. (a) Define Joule Thomson Coefficient and Inversion Temperature. What is the significance of Inversion Temperature in adiabatic expansion of real gas?
(b) Describe comparison between Reversible Isothermal and Adiabatic expansion for an ideal gas. Show with graph if any.
(Compulsory)
IX.
(a) Under what conditions is Van't Hoff factor 'i' not equal to one ?
(b) Define Electrophoresis.
(c) What is Standard State?
(d) Define enthalpy of formation.
(e) Define Gold Number.
(f) Define the term 'Chemical Potential.'
(a) Give different methods for the formation of emulsions.
(b) Explain five important applications of colloids.
(c) Define:
(i) Imbibition
(ii) Peptization
VI. (a) How colloidal solution can be purified?
(b) What is the cause of Tyndall effect?
(c) Why some Colloidal solutions are coloured?
UNIT-IV
VII. (a) What are Colligative Properties? How can you explain the fact that the elevation of Point is a Colligative Property?
(b) What do you know about abnormal molecular masses? Explain.
(c) What are ideal and non-ideal solutions?
VIII. (a) Thermodynamically derive the relationship between elevation in Boiling Point and relative lowering of Vapour Pressure.
(b) A 10% solution of an organic compound (with Mol. W192) is given. Taking R =0.0821
litre.atm/degree/mol. Calculate osmotic pressure at 10° C.
(c) Explain in detail about azeotropes.
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