Physical 121-final 2005
This document was uploaded by user and they confirmed that they have the permission to share it. If you are author or own the copyright of this book, please report to us by using this DMCA report form. Report DMCA
Overview
Download & View Physical 121-final 2005 as PDF for free.
More details
- Words: 431
- Pages: 1
(B. Sc. Biochemistry) Second Semester 2005 Subject: Chem 121 (Physical Chemistry II)
Full Marks: 100 Pass Marks: 45 Time: 3 hours
Candidates are required to give their answers in their own words as far as practicable. The figure in the margin indicates full marks. (3× ×14 = 42)
Group (A) Long Questions (Any three)
1. What is the difference between chemical cells with and without transference? Derive an expression for the emf of chemical cell without transference. 2. Show your familarity with BCS theory of superconductors. Show that superconductor is a perfect diamagnet. 3. Starting from the postulates, derive Langmuir adsorption isotherm. 4. Derive the relationship between entropy and probability ( S = K lnW) 1. 2. 3. 4. 5. 6. 7. 8.
Group (B) Short Questions: (Any six) (6× ×7 = 42) Starting from Van't Hoff isotherm, derive Nernst equation for the emf of a cell. What will be the emf of the cell Zn(s) / Zn+2 (0.01 M) Fe+2 (0.005 M)/Fe(s) at 298 K. Given E0cell = 0.323 V. State Bragg's law. Calculate the angle at which first order diffraction will occur in an X-ray diffractometer when X-rays of wavelength 1.539 A0 are diffracted by crystal, given that the interplanar distance is 2.04 A0. What are the Miller indices? How are they determined? What would be the Miller indices of a plane which makes intercepts 1/2, 2 and 3/2 multiples of unit cell edge length? Derive Gibbs phase rule from thermodynamic combinations A certain system absorbs 8.81× 108 ergs of radiation of the wavelength 2541 A0 in a certain time. It is observed that 1.12 × 10-6 moles of the irradiated substance has reacted in the same time. What is the quantum yield for this reaction. Derive an expression for translational partition function. Show the relation of entropy with translational partition function. (2× ×8 = 16)
Group (C) Very Short Questions: (Any eight) 1. 2. 3. 4. 5. 6. 7.
Point out difference between a galvanic cell and an electrolytic cell. Define over voltage. What do you mean by primary and secondary cells? Define allotropy and polymorphism. What are phonons and cooper pairs? Show your familiarity with sintering. What is the number of components, phases and degree of freedom in the following equilibrium system: CaCO3 (s) == CaO (s) + CO2 (g) 8. What is a condensed system. 9. Differentiate between phosphorescence and fluorescence 10. Write the expression of Bose – Einstein distribution law. 11. What do you understand by the term Fermion? 12. Why is the standard third law entropy value less than statistical value for CO? ***
Full Marks: 100 Pass Marks: 45 Time: 3 hours
Candidates are required to give their answers in their own words as far as practicable. The figure in the margin indicates full marks. (3× ×14 = 42)
Group (A) Long Questions (Any three)
1. What is the difference between chemical cells with and without transference? Derive an expression for the emf of chemical cell without transference. 2. Show your familarity with BCS theory of superconductors. Show that superconductor is a perfect diamagnet. 3. Starting from the postulates, derive Langmuir adsorption isotherm. 4. Derive the relationship between entropy and probability ( S = K lnW) 1. 2. 3. 4. 5. 6. 7. 8.
Group (B) Short Questions: (Any six) (6× ×7 = 42) Starting from Van't Hoff isotherm, derive Nernst equation for the emf of a cell. What will be the emf of the cell Zn(s) / Zn+2 (0.01 M) Fe+2 (0.005 M)/Fe(s) at 298 K. Given E0cell = 0.323 V. State Bragg's law. Calculate the angle at which first order diffraction will occur in an X-ray diffractometer when X-rays of wavelength 1.539 A0 are diffracted by crystal, given that the interplanar distance is 2.04 A0. What are the Miller indices? How are they determined? What would be the Miller indices of a plane which makes intercepts 1/2, 2 and 3/2 multiples of unit cell edge length? Derive Gibbs phase rule from thermodynamic combinations A certain system absorbs 8.81× 108 ergs of radiation of the wavelength 2541 A0 in a certain time. It is observed that 1.12 × 10-6 moles of the irradiated substance has reacted in the same time. What is the quantum yield for this reaction. Derive an expression for translational partition function. Show the relation of entropy with translational partition function. (2× ×8 = 16)
Group (C) Very Short Questions: (Any eight) 1. 2. 3. 4. 5. 6. 7.
Point out difference between a galvanic cell and an electrolytic cell. Define over voltage. What do you mean by primary and secondary cells? Define allotropy and polymorphism. What are phonons and cooper pairs? Show your familiarity with sintering. What is the number of components, phases and degree of freedom in the following equilibrium system: CaCO3 (s) == CaO (s) + CO2 (g) 8. What is a condensed system. 9. Differentiate between phosphorescence and fluorescence 10. Write the expression of Bose – Einstein distribution law. 11. What do you understand by the term Fermion? 12. Why is the standard third law entropy value less than statistical value for CO? ***
Related Documents
Physical 121-final 2005
November 2019 7
Physical World
June 2020 8
Physical Fitnes.pdf
May 2020 6
Physical Therapy
April 2020 9
Physical-assessment.doc
December 2019 14