Download SGBAU B-Tech 4th Sem Chemical Engineering Applied Physical Chemistry Question Paper

Pages: 3

Time : Three Hours

10994 : Applied Physical Chemistry : 4 CH 04

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AW - 3067

Max. Marks : 80

Notes :

Answer three questions from Section A and three questions from Section B.

Assume suitable data wherever necessary.

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Diagrams and chemical equations should be given wherever necessary.

Illustrate your answer necessary with the help of neat sketches.

Discuss the reaction, mechanism wherever necessary.

Use of pen Blue/Black ink/refill only for writing the answer book.

1. 1. What is conductance of an electrolyte? Explain different types of conductometric titrations. (6)

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   2. How will you determine pH of unknown solution for following cell, using EMF measurement? (4)
      Hg | Hg₂Cl₂(KCl_Sat) || unknown. c, pH | Pt
   3. The molar conductance at infinite dilutions for sodium acetate and hydrogen chloride at 30°C are 91.0x10^-5 and 426.16x10^-5 Sm²mol^-1 respectively. Also for H⁺ ions in HCl, t₊ is 0.821 and for CH₃COO^- ions in CH₃COONa, t_- is 0.556. Assuming that t₊ = t_-. Calculate Λ°_m for CH₃COOH. (4)

   OR

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2. 1. What are concentration cells? Derive expressions for the EMF of concentration cells. (6)
      1. With transference
      2. Without transference
   2. What do you mean by specific and equivalent conductance of an electrolytic solutions? Write their interrelation. (4)
   3. At 25°C, the degree of dissociation (α) of pure water is 1.90x10^-7. Calculate the molar conductance (Λ°_m) and specific conductance (k) of water at this temperature. The molar ionic conductance of H⁺ and OH^- ions are 349.83x10^-5 and 198.50x10^-5 Sm² mol^-1 respectively. (4)

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3. 1. Define collision parameter and derive an expression for collision number. (6)
   2. State law of corresponding state. (3)
   3. Critical constants for benzene are T_c =560.5k and P_c =47.5atm . Calculate the van-der wall's constants. (4)

   OR

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4. 1. Deduce the Virial equation of state from Vander wall's equation and critical state. (6)
   2. State the postulates of Kinetic theory of gases. (3)
   3. Find average and most probable velocity of CO₂ gas at 30°C. (R =8.314 J K^-1mol^-1) (4)

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5. 1. State Stark - Einstein law of photochemistry and give the examples of photochemical reactions which shows deviation from this law. (6)
   2. Define: (3)
      1. Wavelength
      2. Wave number
      3. Chemical shift

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   3. What is the selection rule for IR and NMR spectroscopy? (4)

   OR

6. 1. Derive an expression for moment of Inertia frequency of spectral lines of a diatomic molecule acts as rigid rotator. (6)
   2. Define: (3)
      1. Electromagnetic spectrum

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      2. Photosensitization
      3. Phosphorescence
   3. Define Quantum yield of photochemical reaction. Give the reason of low quantum yield of a photochemical reaction. (4)

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7. 1. State and explain BET equation for multilayer adsorption. (6)
   2. Distinguish between physisorption and chemisorption. (3)
   3. Explain homogenous catalysis with acid - base catalysis. (4)

   OR

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8. 1. Derive Langmuir adsorption isotherm. Write the factors on which adsorption depends. (6)
   2. Explain the various characteristics of catalyst. (3)
   3. Explain the following with examples. (4)
      1. Catalytic poisoning
      2. Auto catalysis

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9. 1. Derive rate equation for first order reaction and write two examples (reactions). (6)
   2. In first order reaction, it takes the reactant 40.5 min. to be 25% decomposed. Calculate the rate constant of reaction. (3)
   3. What is Zero order reaction. Explain with example. (4)

   OR

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10. 1. Show that for first order reaction, the time required for 99.9% completion of the reaction is 10 times that required for 50% completion. (3)
    2. What is order of reaction? Explain Pseudo - unimolecular reaction with example. (4)
11. 1. Discuss the thermodynamic scale of temperature. (6)

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    2. State first law of thermodynamics with its limitations. (4)
    3. Define (4)
       1. Enthalpy
       2. Entropy
       3. Gibb's free energy

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    OR

12. 1. State the third law of thermodynamics and Explain how absolute entropy can be calculated from this law. (6)
    2. Define (4)
       1. Free Energy
       2. Chemical potential

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    3. Explain the following (3)
       1. Isolated system
       2. Open system
       3. Adiabatic process

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