TYBSc Chemistry Sem 6 Physical Chemistry Question Paper PDF 2026 - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate full marks

1. Q1 Answer the following (any four) A Derive expression for the cell emf for concentration cell with transference (5) reversible to cation B Set up the electrode concentration cell without transference reversible to cation (5) using HCl electrolyte and obtain an expression for its emf C Define: Overvoltage. How is it determined experimentally? (5) D A solution of silver nitrate with concentration of 0.1 mole per dm? is (5) electrolysed with a platinum cathode. Predict whether hydrogen gas will be liberated at cathode or silver will get deposited Assume overvoltage of hydrogen on platinum to be equal to zero and E The emf of the following cell with transference is 0.0 20 volt. Calculate the (5) transport number of cation and anion F Define activity coefficient. Obtain the expressions for activities of uni - (5) bivalent and uni - trivalent electrolytes
2. Q2 Answer the following (any four) A a) Define : i) Polymerization ii) Degree of polymerisation (2)
   • b) The intrinsic viscosity of a solution of polymer in an organic solvent is 1.82dl at 298K. Calculate the Molar mass of the polymer B What are light emitting polymers? Give their applications. (5) C Classify the polymers on the basis of their source and structure with suitable (5) D a) Explain the term curing agents. What are their types? (3) 3
   • b) What are antioxidants? How are they classified? E Describe the method of determination of molecular weight of polymer using (5) F A polymer sample has 100g, 200g and 300g of polymers of molecular weight 10,000, 20,000 and 30000 respectively. Calculate (i) Mw 2
3. Q3 Answer the following (any four) A State de-Broglie’s equation. Prove that de — Broglie wavelength of electron is (5) given by 1 , where m is the mass of electron accelerated by a B State the drawbacks of classical mechanics. Explain any one in detail. (5) C Define commutative and non commutative operators. State whether the (5) following operators are commutative or non commutative?
4. Q1 A =d/dx and B function f li) A =d/dx and B =J on function f (x) = sin5x D Define the following: (5) E Explain the construction and working of Bacon’s H2 — fuel cell. (5) F State Heisenberg’s uncertainty principle. Calculate uncertainty in the position (5) of electron weighing 9.1 x kg and moving with 1/5 of velocity of light, if the uncertainty in momentum is 2.5%
5. Q4 Answer the following (any four): A Explain the working of NMR Spectrometer with the help of a diagram. (5) B Explain relaxation processes in NMR spectroscopy? Why is relaxation process (5) C What is Larmor’s Precession? Explain in detail. (5) D With the help of schematic diagram describe the construction and working of (5)
   • E.S.R. Spectrometer E What is hyperfine structure? How does it arise? (5) F How does ESR spectrum of hydrogen differ from deuterium? (5)
6. Q5 A in the blanks with the correct option provided (any five) 5 marks
   • a) For electrolytes of the same type the values of mean ionic activity coefficient
7. Q1 Nearly the same Different iii) Zero is an example of
   • c) the electrical energy available for doing work is less than free energy
   • d) For concentration cell, is
   • e) Saturated solution of KCI is used in making salt bridge because <
   • i) velocity of K* and CI is nearly velocity of K* and ii1) KCT is soluble in water
   • f) Tafel proposed, the theory of
8. Q1 electrolytic dissociation ii)hydrogen overvoltage and (i1)
   • g) Inconcentration cell two electrodes are chemically
   • h) Reduction of metal ion leads to deposition of the metal on the B State whether the following statements are TRUE or FALSE (any five). (5)
   • a) Vulcanized rubber is an example of thermosetting plastic
   • b) Thermoplastic polymers cannot be recycled
   • c) Antistatic agents are hydroscopic chemicals
   • d) For synthetic polymers Mn
   • e) The degree of polymerization is a measure of weight of polymer
   • f) Methyl cellulose is a semi synthetic polymer
   • g) Epoxy resins are thermosetting resins C Match the following (any five) (5)
   • b. Range of energy of an electron
9. Q5 Planck e. Discrete packets of energy layer g. Scattering of electrons D State whether the following statements are TRUE or FALSE. (any five) (5)
   • a) spectroscopy is useful in the study of metal complexes
   • b) The mutual exchange of spin in precessing nuclei gives rise to spin-spin
   • c) The NMR spectrum cannot be recorded with zero spin nuclei
   • d) The hyperfine structure of the ESR spectrum is due to nucleus-nucleus
   • e) With the process of transfer of hydrogen nucleus to higher energy state by absorption of radiation is called excitation
   • f) A nucleus with zero spin interacts with the applied magnetic field
   • g) For the total spin of the nucleus is one

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