Download PTU B.Sc-BT 2020 March 2nd Sem 47012 Physical Chemistry Question Paper

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Roll No. EEEEEEEEEEE Total No. of Pages : 02
Total No. of Questions : 09

B.Sc.(BT) (2014 to 2017) (Sem.-2)
PHYSICAL CHEMISTRY
Subject Code : BSBT-106

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INSTRUCTION TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.

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3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Write briefly :
   1. Define Zeroth law of thermodynamics. Give its important application.
   2. What is thermodynamic basis of Hess law?
   3. What is the basis of thermodynamic scale of temperature? Why is it more basic than that based on ideal gas?

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   4. What is meant by triple point of water? Why is it different from normal melting point of'ice?
   5. What is the difference between eutectic point and cryohydric point?
   6. Why all the four phases cannot exist together in sulphur system?
   7. How can you justify that osmotic pressure is a colligative property?
   8. Which colligative property is used for finding the molecular masses of polymers and why?

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   9. Briefly explain the effect of solvent on the rate of reaction.
   10. Derive the expression for decay constant of a radioactive substance.

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SECTION-B

2. Derive expressions for AH and AE for adiabatic reversible expansion of a real gas.
3. What is Carnot cycle? How does it lead to the definition of entropy?
4. Draw and explain a phase diagram for one component system comprising more than one solid phase.

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5. Write a detailed note on pseudo-order reactions.
6. Derive thermodynamically the expression for relative lowering in vapour pressure.

SECTION-C

7. 1. Discuss in details the phase diagram for KI-H2O system.
   2. Calculate the activation energy of a reaction whose reaction rate at 27°C gets doubled for 10°C rise in temperature.

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8. 1. After 24 hours, only 0.125 g out of the initial quantity of 1 g of a radioactive isotope remains behind. What is its half-life period?
   2. Write a detailed note on acid base catalysis.
9. 1. A solution contains 6 g of a solute dissolved in 250 ml of water gave an osmotic pressure of 4.5 atm at 27°C. Calculate the boiling point of the solution. The molal elevation constant of water is 0.52K Kg/mol.

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   2. Write a detailed note on Nernst heat theorem.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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