MSc Chemistry (Organic And Analytical) SEM I 2022 2023 Dec 2023 CHEMISTRY PHYSICAL CHEMISTRY Question Paper - Mumbai University | munotes

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1. Q2 Figure to the right indicates full marks
2. Q3 Use of non — programmable scientific calculator is allowed 9.110 kg leV = 8.06 x Atomic mass of H=1,C 16,S = 32, Cl 1.A) Attempt any two of the following:
3. Q1 Using Maxwell relation prove that il) Show that Joule Thomson coefficient = 0 for an ideal 4 on the liquification of an ideal gas ili) Write the expression for entropy change in the following phase 4 4 marks
   • iv) What is state function? Give the significance of Maxwell’s relation. 4 1.B) Attempt any one of the following:
   • i) The heat capacity Cp in of a substance is given by following 4 At the melting point (150K) = 1255.2 J mol’. Calculate absolute entropy of the substance in the liquid state at 300K?
   • ii) Calculate 7 for a certain gas at 273K and 150 bars taking Cp as 36.5 4 JK" The van der Waal’s constant a and b are 0.139 and 2.A) Attempt any two of the following:
4. Q1 What do you mean by degeneracy and non degenerate of energy levels? Find the degree of degeneracy li) State the basic postulates of quantum mechanics. 4 ili) Verify that the wave functions of a particle in a one — dimensional box of 4 width a and infinite height are orthogonal 4 marks
   • iv) Explain the concept of particle wave and Schrodinger wave equation. 4 2.B Attempt any one of the following:
5. Q1 Calculate the energies (in eV) of an electron constrained to move infinite one — dimensional box of width 1 A and exhibit these energies in il) If A and B are two operators such that [ A,B] = 1 show that [A, B2] = 2B 4 3.A) Attempt any two of the following: 4 marks
6. Q1 Write the reaction mechanism for the decomposition of acetaldehyde and using steady state principle show that = li) Explain the kinetics of free radical polymerization. 4 ili) Explain in brief the Rice-Ramsperger Kassel Marcus (RRKM) theory. 4 4 marks
   • iv) Explain the mechanism of decomposition of ozone. 4 3.B) Attempt any one of the following:
7. Q1 Consider the following consecutive reaction Here and k> are the rate constants for a first order reaction If = 1.0: 0.25. After what time from the start of the reaction, the concentration of B will be maximum? Given = 5 x li) The rate of formation of C in the reaction, 4 2A +B—2C+3D mol L's". State the rate of reaction and the rates of formation or consumption of A, B and D 4.A) any two of the following: 4 marks
8. Q1 Explain the relaxation effect for the conductance of strong electrolytes and write the expression for relaxation force li) Explain Debye-Falkenhagen effect and Wien effect for the conductance of 4 Explain the construction and working of the phosphoric acid fuel cell. 4 4 marks
   • iv) Explain the use of enzymes as electrodes. 4 4.B) Attempt any one of the following:
9. Q1 Calculate the mean activity coefficient of (1) 0.05m (ii) 0.002m K,SO, in aqueous solution at 298K. (Given: A for water at 298K is 0.509) li) Calculate the resting membrane potential for the following: 4 (Given that at 298K = 61) 4 marks
10. Q5 Attempt any four of the following
    • a) Write a note on the third law of thermodynamics. 3
    • b) Give the reason which molecule of the pair given below has greater molar 3 entropy under the same condition What is condition required for orthogonality of wave function? Show that 3 two normalized wave function and are orthogonal to each other
    • d) Write a note on Hamiltonian operator. 3
    • e) Explain the principle of microscopic reversibility. 3
    • f) Explain in brief about factors affecting explosion limits. 3
    • g) Write any two applications of molten carbonate fuel cell. State one 3 advantage of fuel cell over conventional cell
    • h) State Debye-Huckel-Onsager equation and explain its validity for non- 3

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