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 Attempt any three of the following :— Define dipole moment. Explain the structure of BF, and NH, on basis of dipole moment. 5
   • (B) What is meant by Raman effect ? What are stokes and anti stokes lines? Howdothey 5 differ from Rayleigh line
   • (C) Show that the frequency of fundamental, first and second overtone bands areinthe 5 ratio 1: 2 : 3 for anharmonic oscillator
   • (D) Obtain a relationship between moment of inertia and of adiatomicmolecule 5
   • (E) Calculate the bond length of carbon monoxide molecule, ifthe rotational 5 the molecule is 1.90 x 107
   • (F) What is meant by zero point energy ? Calculate the zero point energy 5 whose vibrational frequency is 2 x
2. Q2 Attempt any three of the following :—
   • (A) Explain: (i) Wave Particle duality 5
   • (B) State Schrodinger wave equation for a particle in three dimensional motion. Identify 5 the terms involved. Give the properties of wave function
   • (C) Explain the term commutative operators. Find whether the two operators A andB 5 commute or not, if A = and
   • (D) What is meant by eigen function and eigen value ? Find eigen function and eigen 5 value for sin 4x when it is operated by
   • (E) What is meant by electroplating ? Explain the process and theory behind it. 5
   • (F) Explain the Tafel’s theory of hydrogen overvoltage. 5
3. Q3 Attempt any three of the following :—
   • (A) Describe the construction and working of hydrogen oxygen fuel cell. 5
   • (B) Answer the following :—
   • (i) Give the merits of fuel cell. 2
   • (ii) Explain why hydrogen is called the fuel of the future. 3
   • (C) Explain why ethanol gives three peaks in NMR spectra. 5
   • (D) Name the internal standard used for production of NMR spectra. Why used ?What 5 are the peak positions of the internal standard ?
   • (E) What are fast reactions ? Describe the stop flow method to study the kinetics of stop 5
   • (F) State the important assumptions of collision theory. Give merits and limitations ofthis 5
4. Q4 Attempt any three of the following :—
   • (A) Explain the term radioactive equilibrium. How does it differ from chemical equilibrium? 5
   • (B) Describe the construction and working of Gieger Muller counter. 5
   • (C) What is meant ? Explain how they are used to study mechanism of hydrolysis 5
   • (D) Name the basic components of a nuclear reactor and explain them. 5
   • (E) Calculate the Q-Value and threshold energy of the nuclear reaction. 5
   • (F) decays to by What will be the weight of in equilibrium withig 5 of The half life of is 28 years and that of = 63 hour
5. Q5 (A) Choose the correct answer :— 4 marks
   • (a) The dipole moment of p-dichlorobenzene is
   • (i) Unity
   • (ii) Zero
   • (b) Which of the following molecule is microwave active ?
   • (ii) O,
   • (iii) HCI
   • (c) Number of vibrational modes in H,O are
   • (ii) 4
   • (iii) 9
   • (d) can be classified as out of plane vibrations
   • (i) Rocking
   • (ii) Scissoring
   • (iii) Wagging OR [ TURN OVER
   • (A) State True or False of the following :— 4
   • (p) The rotational lines on the higher frequency side constitute R-branch lines of
   • (q) The heavier isotopic molecule has smaller value of the rotational constant B as compared to lighter isolopic molecule
   • (r) Dipole moment is scalar quantity
   • (s) According to Rule of Mutual exclusion, IR active molecule are Raman active too
6. Q5 (B) Choose the correct answer :— 4 marks
   • (a) A.C f(x) =CA f(x), where C is a constant is operator
   • (i) Linear
   • (ii) Sound
   • (iii) Stationary
   • (b) The waves associated with motion of electron are waves
   • (i) Progressive
   • (ii) Sound
   • (iii) stationary
   • (c) When the operator operators on wave function = the eigen value is
   • (ii) 4
   • (iii) 4x
   • (d) The overvoltage is given by the where is decomposition potential and Eis reversible potential (ii) (iii)
   • (B) State True or False of the following :— 4
   • (p) The classical mechanics could not explain the phenomenon of black body radiation
   • (q) Operators exist in classical mechanics
   • (r) Decomposition potential depends on the temperature at which electrolysis is carried
   • (s) Simultaneous deposition of two metals from the same solution is possible if their deposition potentials are same
7. Q5 (C) Choose the correct answer :— 4 marks
   • (a) The reversible potential of lithum ion cell is
   • (ii) less than 3.0V
   • (iii) 2.0V
   • (b) in fuel cells, the electrode reactions are
   • (i) reversible
   • (ii) irreversible
   • (iii) at equilibrium
   • (i) half integral
   • (ii) integral
   • (iii) zero
   • (d) The energy of the activated complex formed as an intermediate in a chemical reaction has energy products
   • (ii) less than
   • (iii) equalto
   • (C) State True or False of the following :— 4
   • (p) According to activated complex theory, the rate of reaction is given by rate of decomposition of activated complex into the products
   • (q) Fuel cells are galvanic cells
   • (r) The most widely used solvent in NMR spectra is
   • (s) The relaxation process is the one in which proton in lower energy state goes toa higher energy state
8. Q5 (D) Choose the correct answer :— 3 marks
   • (a) One Curie is disintegrations per second
   • (ii) 3.7 x 107 (iii)
   • (b) The best projectile that can be used in nuclear transmutation reactions is
   • (i) proton
   • (ii) neutron
   • (iii) deutron
   • (c) K-electron capture is characteristic of
   • (i) natural radioactivity
   • (D) State True or False of the following :— 3
   • (p) Fission of is brought about by fast neutrons
   • (q) is fertile material
   • (r) During exoergic nuclear reaction, energy is evolved

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