TYBSc Chemistry Sem 6 May. ()(.) Chemistery Physical Chemistery () .may (pc ) 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) State any three merits and two drawbacks of collision theory. 5
   • (b) With the help of neat labeled diagram explain the stop flow method usedto 5 study the kinetics of fast reactions. State the advantages of this method
   • (c) Explain the low resolution NMR spectrum of methanol and ethanol. 5
   • (d) Discuss the viscocity method of determining molar mass of polymers. 5
   • (e) A polymer sample is composed of chains of three distinct molecular weights 5 2 x 10*,3 x 104 and 4 x 10* in the ratio
   • (f) Explain the following terms with suitable diagrams in NMR spectroscopy : 5
   • (i) Flipping of a proton (ii)
2. Q2 Attempt any three of the following :—
   • (a) Define an expression for determination of pH using quinhydrone electrode in 5 acidic and alkaline medium
   • (b) Define decomposition potential. Describe the experimental 5 determination of decomposition potential
   • (c) (i) State any two objectives of electroplating. 2
   • (ii) The overvoltage of hydrogen on a certain cathode is 0.44V. Calculate the 3 minimum voltage that must be applied to evolve hydrogen on this cathode from a solution of pH = 3.6
   • (d) Describe the principle, construction and working of the silicon withthe 5 help of a neat labeled diagram
   • (e) The emf of the cell 5 sat- with AgCl is 0.0390V at 298K. Calculate the solubility product and solubility of in pure water at 298K. (y of KCI = 0.769)
   • (f) (i) Name the cathode and anode used in the lithium ion cell. 2
   • (ii) State any three advantages of hydrogen as a fuel. 3
3. Q3 Attempt any three of the following :—
   • (a) Describe the principle, construction and working of GM counter. 5
   • (b) (i) Explain secular radioactive equilibrium. 2
   • (ii) Calculate the weight of in equilibrium with 1g of The halflife of 3 is 6.97 x years while that of is 22.4 hours
   • (c) Explain the basic components of a nuclear power reactor. 5
   • (d) Discuss the use of radioisotopes as tracers in Friedel-Craft’s reaction andester 5
   • (e) For 27Al (n, y) reaction Q value is 6.569MeV. If the mass of the neutron 5 is 26.990080 amu and 1.0089830 amu respectively. Calculate the mass of the
   • (f) Explain the thermonuclear reactions on earth. 5
4. Q4 Attempt any three of the following :—
   • (a) Explain any two limitations of classical mechanics. 5
   • (b) (i) State and explain Heisenberg’s Uncertainity Principle. 2
   • (ii) A cricket ball weighing 50g is to be located within 0.2 x What 3 is the uncertainity in its velocity ?
   • (c) The first order reflection maxima from (100), (110), (111) planes of a given crystal 5 occur at and respectively. What type of a lattice does the crystal
   • (e) Explain the following with suitable examples : 5
   • (i) Linear operator
   • (f) State and explain any two laws of crystallography. 5
5. Q5 (A) Choose the correct answer :— 4 marks
   • (a) Ultracentrifuge method for determination of molecular weight requires quantities of synthetic macromolecules
   • (i) large
   • (ii) small
   • (iii) both
   • (b) is a natural polymer
   • (i) cellulose
   • (ii) Melamine
   • (iii) Nylon
   • (c) Anucleus containing even number of protons and even number of neutrons will have spin
   • (i) zero
   • (ii) integral
   • (d) The rate of the reaction is to the energy of activation
   • (i) directly proportional
   • (iii) Not proportional OR [ TURN OVER
   • (A) State whether True or False :— 4
   • (p) Silk is an example of an inorganic polymer
   • (q) According to the activated complex theory of reactions rates, the rate constant of a reactions is given by
   • (r) The ratio of weight average molecular weight to number average molecular weight is called polydispersity index
   • (s) has zero spin
   • (B) Match the following :— 4
   • (b) AS (ii) -nFE
   • (d) Hydrogen oxygen fuel cell (iv) aT
   • (B) State whether True or False 4
   • (p) Quinhydrone electrode can function satisfactorily in highly acidic solutions
   • (r) If the temperature coefficient is positive the emf of the cell decreases with rise
   • (s) Calomel electrode is used in the experimental determination of overvoltage
   • (C) Choose the correct answer :— 4
   • (a) In a breeder reactor U is converted into (ii) (iii)
   • (b) An ideal phosphor should have _ scintillation efficiency
   • (i) low
   • (ii) high
   • (iii) medium
   • (c) The change 33 Si requiress the emission of :
   • (i) a particle
   • (ii) positron
   • (iii) neutron
   • (d) In nuclear transmulation
   • (i) total charge and number of nucleons is conserved
   • (ii) only total charge is conserved
   • (iii) neither total charge nor number of nucleons are conserved
   • (C) State whether True or False 4
   • (p) is called fissile material
   • (q) Radiactive equilibrium is essentially an irrversible equilibrium
   • (r) In artificial radioactivity there are no radiactive series of elements formed
   • (s) > + is an example of (a, n) type of nuclear transmutation
   • (D) Choose the correct answer :—
   • (a) The wave function 3
   • (i) should be finite, single valued and continuous
   • (ii) should be discontinuous
   • (iii) should be infinite and single valued
   • (b) The expression of the de Broglie’s equation is :
   • (ii) A=
   • (iii) p=ha
   • (c) NaCl molecule has elements of symmetry
   • (ii) 22
   • (iii) 24
   • (D) State whether True or False :— 3
   • (p) not an eigen function of the operator
   • (q) A total of four Na* ions belongs to a unit cell
   • (r) X-rays an produced in a Coolidge tube

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