BSc Sem VI 2022 2023 Apr 2023 CHEMISTRY PHYSICAL CHEMISTRY Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate full marks

1. Q1 Attempt any four of the following:
   • A. a note on liquid junction potential. Give functions of salt bridge. 5
   • B. are galvanic cells? Classify them. 5
   • C. Derive an expression for the emf of electrolyte concentration cell with 5 transference reversible to cation
   • D. an expression for the emf of electrode concentration cell reversible 5
   • E. Explain the terms i) Polarization ii) Decomposition potential 5 Define overvoltage. In electrolysis of 2 N sulfuric acid, the hydrogen 5 overvoltage at lead cathode was found to be 0.64 V at 298 K for a given current density. What will be the hydrogen overvoltage if the current density is increased to twice its present value for the same cathode under same
2. Q2 Attempt any four of the following:
   • A. How are polymers classified on the basis of physical properties? 5
   • B. Explain the method for determination of molecular weight of polymers. 5
   • C. a note on curing agents. 5
   • D. What are stabilisers? Explain with examples. 5
   • E. What is LEP? How are they prepared? 5
   • F. Equal weights of polymer molecules each of molecular weight 40,000 g/mol 5 and 50,000 g/mol are mixed. Calculate Mn and Mw
3. Q3 Attempt any four of the following:
   • A. is an operator? How is multiplication of operators carried out? Show 5 that the following pairs of operator commute and on f(x) = Sinx
   • B. What are the salient features of a black body radiation? How does classical 5 theory explain the variation of intensity with respect to Temperature?
   • C. the Planck’s theory of quantisation. 5
   • D. work function of silver metal is 4.7 eV. Calculate the Kinetic energy A and velocity of the electron ejected when a radiation of wavelength 300 nm is incident on the silver surface. Will photoelectrons be observed?
   • E. Explain the Structure of Solar cell with the help of diagram. 5
   • F. Explain how Hydrogen be generated by direct electrolysis of water. 5
4. Q4 Attempt any four of the following:
   • A. the term nuclear spin in NMR. 5
   • B. Explain spin-spin and spin- lattice relaxation in NMR. 5
   • C. the principle and fundamental equation of NMR. 5
   • D. the principle of ESR spectroscopy. 5
   • E. Write on ESR spectrometer. 5
   • F. Explain the ESR spectra of hydrogen. 5
5. Q5 Answer the following:
   • A. Select whether the following statements are true or false (Any five) 5
   • a. For galvanic cells the value of is always greater than 1
   • b. Incase of concentration cells both half cells are chemically identical with differing in concentrations
   • c. The value of the hydrogen overvoltage for lead cathode is less than platinum cathode under same conditions
   • d. Liquid junction potential cannot be removed completely, but it can be
   • e. For sulfuric acid the activity can be represented as a = (m.y+)”
   • f. ideal solution, the value of activity coefficient is always equal to one
   • g. With change in pH of solution the value of overvoltage remains same
   • h. represented as, Zn Ag is an example of
   • B. Fill in the blank with appropriate words given in the bracket. (Any five ) 5
   • a. a linear polymer
   • b. is a thermoplastic polymer
   • c. The repeated unit in a polymer is called is used as adhesives
   • e. Polymers having long range elasticity are called
   • f. average molar mass is denoted as
   • g. LED is made of --------material
   • C. Select and write the appropriate answer. (Any five) 5
   • a. Newton’s law of mechanics is the backbone of
   • i. Quantum mechanics
   • b. Total radiation emitted per unit surface area is called
   • i. Energy
   • c. The waves which do not travel in vacuum
   • i. Matter
   • ii. Rotational Volume occupied by a particle location and motion of particle area occupied by the particle
   • iv. of the particle
   • e. Schrodinger equation is a
   • f. Hamiltonian is given by
   • i. Kinetic Energy Sum of kinetic and potential energy
   • iv. momentum
   • g. One of the ways to tap solar energy is
   • i. stark effect
   • h. The band possessed by valence electrons is called
   • D. Match the column (Any 5
   • ii. Solvent in NMR spectrometer
   • d. iv. I=1
   • e. ESR spectra
   • f. Hyperfine splitting of deuterium vi
   • g. vii. 2 peaks
   • ix. ratio

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