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 :—
   • (A) Explain the concept of ‘Activated complex’. 5
   • (B) Differentiate between thermoplastic and thermosetting polymers. 5
   • (C) Explain the effect of environment on the proton resonance in a magnetic field. 5
   • (D) Give reason :
   • (i) Tetramethyl silane is used as internal standard in NMR spectroscopy. 2 Three peaks are observed in NMR spectrum of ethanol. 3
   • (E) The reaction 2XY— X,+ Y, takes place at 560K at aconcentration of | mol 5 The total number of collisions taking place per second per cubic meter is 5 x and effective collisions are 1:95 x 10!4 per second per cubic meter Calculate the activation energy of the reaction
   • (F) Calculate the number average molecular weight and weight average molecular 5 weight for a polymer sample which has four diefferent kinds of molar masses as 1:5 x 5 x 2 x 3.5 x present in the ratio 1:2 :3:4
2. Q2 Attempt any three of the following :—
   • (A) Explain how emf measurements can be used to determine changes in enthalpy, 5 entropy and free energy of a cell reaction
   • (B) Explain the use of quinhydrone electrode in the determination of 5
   • (C) Define the term overvoltage. How is it determined experimentally ? 5
   • (D) Why lithium is used to prepare high power battery ? Describe the components 5 of a typical lithium-ion cell
   • (E) Calculate the solubility product of AgCl and emf of the following cell 5 if solubility of 1.1 x mol 2 QP CODE No. 00031345
   • (F) density of 1.0 The overvoltage of hydrogen is on platinum electrode. What will be the depostion potetial of hydrogen on this electrode from a solution of pH 2.5 at 298
3. Q3 Attempt any three of the following :—
   • (A) Explain the construction and working of Gieger-Muller counter. What are its 5
   • (B) Describe the various components of a nuclear reactor
   • (C) Define artificial radioactivity. What are the different modes of decay of the artificial radioactive element. Explain
   • (D) Define nuclear fusion. Give the sequence of nuclear reactions in the carbon 5
   • (E) has a half-life of 7.2 x 108 years and its daughter element 5 half-life of 24.75 hour. What is the weight of in equilibrium with one
   • (F) Define Q-value. 5 For the following nuclear reaction What is the atomic mass of P ?
4. Q4 Attempt any three of the following :—
   • (A) What is black body radiation. Which observations classical mechanics failed 5 to explain ? How Planck was able to explain it
   • (B) Explain : 5
   • (i) State function
   • (C) Draw well labelled diagram of : 5
   • (4). Unit cell of NaCl
   • (ii) Centre of symmetry in a simple cube
   • (iii) Plans of symmetry (any two planes) in a simple cube
   • (D) Find the angle at which second order reflection maxima from (100) plane of 5 NaCl is obtained. Wave length of X-rays used is 1.54 x Density of 3 QP CODE No. 00031345
   • (F) (i)Determine which of the following is eigen function with eigen value when 5
5. Q5 (A) State whether the following statements are true or false :— 4 marks
   • (a) Natural polymers are monodispersed
   • (b) The nucleus of Mg possesses half integral spin
   • (c) Kinetics of fast reactions are studied by sedimentation velocity method
   • (d) The solvent CCl, can be used to obtain NMR spectra
   • (A) Choose the correct answer :— 4
   • (p) The nucleus of has spin
   • (q) is synthetic polymer
   • (r) The activiated complex theory of reastion rates is based on
   • (i) kinetic theory of gases — Collision frequency
   • (i) arithmetic (ii) is dependent on molecular size is determined by sedimenation method
6. Q5 (B) State whether the following statements are true or false :— 4 marks
   • (a) Glass electrode is ion selective electrode
   • (b) When the temperature coefficient of a cell is positive, it becomes hot during
   • (c)The value of ‘a’ in Tafel’s equation, logl, depends on cathode used
   • (d)Hydrogen is called the fuel of future because it can be produced on large scale on earth and it is non-pollutant 4 QP CODE No. 00031345
   • (B) Choose the correct answer :— 4
   • (p) The fuel cell reactionis
   • (i) reversible (ii) irreversible (iii) at equilibrium
   • (q) The value for Eg for all the glass
   • (r) Overvoltage is affected ‘
   • (s) Electroplating consists of depositing thin layer of metal over
7. Q5 (C) State whether the following statements are true or false :— 4 marks
   • (a) The can be converted into
   • (c) In the nuclear transmutation reactions, are better projectiles than
   • (d) When the difference in decay constant of two radioelements in equilibrium is very large, then the equilibrium is called secular equilibrium
   • (C) Choose the correct answer :— 4
   • (p) Threshold energy is given
   • (i) (ii) j
   • (q) Transmutation of into is called (—, —) type of reaction
   • (r) The activity of per second is called one Curie
   • (i) 3.7 x (ii) 3.7 x (iii)
   • (s) The reactions takes place in sun and other stars 5 QP CODE No. 00031345
8. Q5 (D) State whether the following statements are true or false :— 3 marks
   • (a) The equation A is called eigen value equation
   • (b) Photo electric effect proved that light has wave nature
   • (c) In NaCl crystal, one is surrounded by and one is surrounded
   • (D) Choose the coorect answer :— 3
   • (p) For a face centred cubic lattice, the length of edge of a cube is x
   • (q) Let two operators be B=/n, {(x)=sinx these two operators are
   • (r) cubic crystal has of symmetry
   • (ii) (iti) 9

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