BSc Chemistry SEM V 2018 19 2018-19 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 the following
   • (A) What is the origin of dipole moment? Explain the structure of and on basis of dipole 05
   • (B) Obtain the expression for the wave number of fundamental band and first overtone in an 05
   • (C) Give study of IR spectra with Raman spectra. (any five points). 05
   • (D) Explain the Rule of Mutual Exclusion with the help of CO2 molecule. 05
   • (E) The rotational constant for HCl molecule is 1059 the bond distance in the molecule. 05 Also Calculate the oscillation frequency of this molecule if the force constant is 516 N
   • (F) A diatomic molecule was exposed to radiations of wave number 2.222 x The first Anti 05 Stoke’s line was obtained at 2.2580 x 10 Calculate the Raman shift, wave number for first Stoke’s line and difference between first Stoke’s and Anti Stoke’s line Attempt any the following
   • (A) the Dynamic method for measuring the lowering of vapour pressure. 05
   • (B) What is meant by reverse osmosis? Give any three applications of it. 05
   • (C) Derive thermodynamically the expression for relation between boiling point elevation of a 05 solution and mole fraction of solute
   • (D) solution of compound A (mol wt = 60) boils at 373.12 K, determine the concentration 05 of the solution. By how much would the normal boiling point of water be raised on dissolving 3.0 g of the same compound A in 84.0 g water. (kp = 0.512 K kg
   • (E) Explain the Lindemann’s unimolecular theory of reaction rate. 05
   • (F) the Flash Photolysis method to study fast reactions. 05 Attempt any the following 15
   • (A) Explain the construction and working of Geiger Muller counter with the help of appropriate
   • (B) Give of artificial radioactivity. Distinguish between artificial and natural radioactivity O5 (any three points)
   • (C) Describe the basic components of a nuclear reactor. 05
   • (D) Give two applications of radioisotopes being used as tracers to study reaction mechanism. 05
   • (E) The Q-value of the nuclear reaction: + 7 H ——> Na + is 2.1413 MeV. Calculate the 05 isotopic mass of Na, the mass of:
   • (F) Define decay constant. A radio element has half-life of 140 days. How much time in seconds will 05 be required so that activity falls to 0.05" of its original value
2. Q4 Attempt any the following
   • (A) State BET equation, identify the terms involved in it,test the validity of the equation. 05
   • (B) Give the assumptions on which Langmuir adsorption isotherm is based. 05
   • (C) Describe any two methods by which colloids acquire electric charge. 05
   • (D) Derive an expression to show that at equilibrium, the distribution of diffusible salt is influenced 05 by the presence of non-diffusible salt across semipermeable membrane
   • (E) an experiment to study electrophoresis. 05
   • (F) the use of surfactants in pesticide and food industry. 05
3. Q5 Answer the following questions
   • (A) Match the following the any five) 05
   • e. Number of vibrational mode for
   • f. Moment of inertia. vi. scattering of light
   • g. Changes in rotational and vibrational
   • ix. H2 molecule
   • (B) State True or False for the five) 05
   • a. Berkley Hartley method is used to determine depression in freezing point
   • b. The salt of in aqueous solution dissociates to give two ions
   • c. Liquids with weak intermolecular forces are less volatile
   • d. Osmotic pressure is related to the activity of the solvent
   • e. Beckmann thermometer is a differential thermometer
   • f. For slow reaction P< 1
   • g. Collision theory considers reacting molecules as rigid spheres
   • h. According to Collision theory, the colliding molecules possess translational and rotational motion
   • (C) in the blanks from the given words.(any five) 05
   • a. ———— is used as phosphor in Scintillation counter
   • b. Threshold energy is calculated for ——————— nuclear reactions
   • c. ————— is fissile material
   • d. Fission reaction is sustained if —————— reactions are known as thermonuclear reactions Al+ 'n —->?’ Mg + 'H is type of transmutation
   • g. can be converted into —————
   • (D) Define :( any five). 05
   • a. Adsorption isotherm
   • c. Sol
   • d. Gel
   • e. Dispersed phase
   • f. Colloidal electrolyte
   • g. isoelectric point

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