BSc Sem V 2023 2024 Nov 2024 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 material is irradiated with a wavelength of 435.8 nm and the first 5 Raman line appears at 440.1 nm. Calculate the Raman shift and identify the type of line
   • B. the expression for the moment of inertia (I )of a rigid rotor. 5
   • C. Explain different types of stretching and bending modes of vibration in 5
   • D. dipole moment. Explain the structure of and on the of dipole moment
   • E. and expression for frequency of P and R branch lines inIR 5 of diatomic molecule
   • F. Calculate the wave number of the first four lines in the rotational 5 spectrum of diatomic molecule (I = 1.457x
2. Q2 Attempt any four of the following
   • A. the dynamic method for determination of relative lowering of 5 vapour pressure when a nonvolatile solute is added to solvent
   • B. Define ebullioscopic constant-Aqueous solution of urea boils at 374.15 5
   • K .What is its molality? (kp = 0.512
   • C. Derive VantHoff’s equation for osmotic pressure. 5
   • D. Derive Lindemann’s Unimolecular theory of reaction rates. 5
   • E. Describe the stop flow method to study the kinetics of fast reaction 5
   • F. 2.50 g of naphthalene (m.wt :128) is dissolved in 25.0 g of benzene. The 5 freezing point of pure benzene is 278.5K, and the freezing point of the solution is 275.8K. What is the molal freezing point depression constant,
3. Q3 Attempt any four of the following:
   • A. neat labeled diagram, explain the principle and working of 5
   • B. The C activity of a sample of wood from the sample is 5.6 dpm/gm. If in living plants the equilibrium value of activity is 24.4 dpm/gm, calculate the age of sample of wood. (Half-life of is 5720 years)
   • C. Derive an equation for the Q value of a nuclear reaction. 5
   • D. a note on artificial transmutation. Give any two artificial nuclear 5
   • E. With the help of diagram, describe different components of a nuclear 5
   • F. Write thermonuclear fusion reactions involved in the carbon Nitrogen 5 cycle which occur in stellar bodies
4. Q4 Attempt any four of the following:
   • A. State BET equation, identify terms involved in it. Test the validity of the 5
   • B. Explain the different types of adsorption isotherm with one example of 5
   • C. What is electro-osmosis? How is it studied experimentally? 5
   • D. What is meant by electric double layer? Explain it with a diagram. 5
   • E. Absorption of hydrogen gas forms a complete monolayer on the surface 5 of charcoal, the volume of hydrogen reduced to S. T. P was found to be 1.79 per g of charcoal. Calculate the surface area of adsorbent, if the area occupied by one hydrogen molecule is 15.0 x
   • F. Write a note on surfactants. 5
5. Q5 Answer the following:
   • A. Choose the correct option and fill in the blank (Any 5 Centre of symmetry]
   • a. Dipole moment of CO2 molecule is
   • b. Equation of moment of inertia I =
   • c. Rotational spectra are obtained in ------- region
   • d. Vibrational motion of a single particle is --------------- motion
   • e. In Anti stokes line Raman shift is
   • f. Mutual exclusion rule is applicable for those molecules that possess
   • g. 1s out of plane vibration is the same atomic number but different mass number
   • B. Select whether the following statements are true or false (Any five) 5
   • a. A property which depends upon the number of particles of solute and independent of its nature is called additive property
   • b. boils at a temperature T; and solvent at temperature T2 , then the elevation in boiling point is T2
   • c. |The depression in freezing point in a one molal solution is called as
   • d. Ostwald and Walker method is used to determine the osmotic pressure of
   • e. The probability factor in the rate equation considers the orientation of the
   • f. The collision frequency is inversely proportional to the concentration of the reacting molecule
   • g. Flash photolysis technique is used to determine the rate of a slow
   • C. Select and write the appropriate answer. (Any five ) 5
   • a. can be used as phosphor in a scintillator counter
   • a) NaCl c) Anthracene
   • b) KCl d) Ethanol
   • b. The average life of a radioactive element is times the half-time
   • c. The process of converting the stable nucleus of one element into unstable nucleus of another element by bombarding it with fast moving particle is
   • d. can be used as moderator in nuclear power reactor
   • e. of nuclear reaction is related to mass defect by relation, Q =
   • f. In Geiger-Muller counter can not detect radiation
   • a) c) B d) *He2
   • g. of the following is fertile material?
   • h. Predict the projectile in the following reaction
   • D. Match the column: (Any five ) 5
   • e. Zeta potential
   • f. Adsorbent Vi Proposed by Guoy model
   • ix. Electrophoresis
   • x. Micelles

Read from the scan above, so a character or two may differ. The scan is the original.