BSc Sem V 2015 2016 2016 Chemistry 1 Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q1 Attempt any three of the following:
   • (A) (i) A solution containing 0.220 g of a certain compound in 100g was found 3 to freeze at the molecular weight of the Freezing point of water is mol")
   • (ii) Why is vapour pressure of the solvent lowered non-volatile solute is 2 dissolved in it?
   • (B) With a neat labelled diagram, explain three compongat exhibiting formation of one pair of partially miscible liquids
   • (C) Define Van't Hoff factor. 5 Derive the relation between Van't Hoff degree of association of solute :
   • (D) Explain application of phase rule to system, 5
   • (E) (i) State and explain Raoult's law. & 3
   • (ii) Give graphical representation elevation in boiling point of a solvent due 2 to addition of a non-volatile so
   • (F) (i) State Gibbs Phase Rule . e any one term involved in it. 2
   • (ii) What are colligative pr ies? Give suitable examples. 3
2. Q2 Attempt any three of the foll
   • (A) (i) Explain with examples homogeneous and hetrogeneous catalysis. 3
   • (ii) Explain the a ation of surfactants in detergents. 2
   • (B) Adsorption of gas forms a complete monolayer on charcoal. The volume of 5 the gas reduced to N.T.P. conditions was found to be 125 cm’ per g of adsorbent the surface area of the adsorbent. The area occupied by each gas
   • (D) phenomenon of electro-osmosis with a neat labelled diagram. Give the tionship between electro-osmotic pressure and zeta potential A Explain colloidal electrolytes with special reference to 5
3. Q3 Attempt any three of the following:
   • (A) Calculate the mean activity coefficient of 0.02 m HCI in 0.002m 5 (A= 0.509 at 298 K for water) transference
   • (B) Derive the expression for emf of the electrolyte concentration cell wi 5 and reversible to cation tation and any two
   • (C) With the help of neat labelled diagram, give the working, advantages of glass electrode. &
   • (D) What is liquid junction potential? Explain its How
   • (E) With suitable examples, explain the classification of electroc em
   • (F) Calculate the liquid junction potential for the following cell if the transport number of Cu” is 0.368 at 298K. (n = 2)
4. Q4 Attempt any three of the following:
   • (A) Give the classification of polymers based on source and roperties. Give suitable 5
   • (B) A substance crystallizes in a form like that of NaCl. is gm? and its molecular weight is 74.5 What is the edge of a single cell?
   • (C) Define number average molecular weight. For Re ution of a polymer in chloroform 5 of concentration 3.0 g/dl, the specific is found to be 0.121. Calculate the molecular weight of the polymer. Given 0:85
   • (D) Explain the term ‘light emitting What are their advantages? 5
   • (E) Explain Frenkel and Schottky crystal lattice. 5
   • (F) Draw neat labelled diagrams of 5
   • (a) X-ray s ometer
   • (b) Unit Cell of
   • (c) Plane of
5. Q5 (A) State True or False: 4 marks
   • (a) Colligative pr on chemical nature i of species present
   • (b) Van't Hoff is given by = nkT
   • (c) Boiling pointylevation of a solute on additi oF non-volatile solute is inversely
   • (d) In gram for water, on any curve F=2,
   • (A) Match the columns 4
   • r) Eutectic point 3)
   • s) Binodal curve 4) F=
6. Q6 Ternary system L
   • (B) in the blanks with correct alternative:
   • (a) In adsorption isotherm amount of adsorbate is plotted against
   • (b) Trace substance added to improve the catalytic activity of catalyst is called
   • (c) A catalyst the energy of activation of a reaction
   • (d) In Chemical adsorption only of adsorbate molecules is possible
   • (B) Choose the correct alternative 4
   • (p) A plot of log K versus pH for a acid catalysed reaction slope
   • (q) Ifexcess of silver nitrate is added to a dilute solution of iodide, the colloidal silver iodide system will have charge
   • (r) The potential difference between the fixed layer and diffuse double layer is
   • (s) For a colloidal solution, the particle
   • (C) Match the following columns 4
   • (C) State the following statements are True or False. 4
   • (p) law is applicable for weak electrolytes
   • (q) Quinkydrone electrode gives good results with solution having pH greater than 8
   • (r) electrode is used in the determination of solubility product of sparingly soluble by using concentration cell, chemical cells, the two electrodes are chemically different
   • (D) Choose the correct alternative. 3
   • (a) Bakelite is an example of
   • (b) nylons and polyesters are examples of
   • (c) The ratio of Weight average molecular Weight to number average molecular ght,
   • (i) Degree of Polymerisation (ii) Polydispersity index
   • (D) in the blanks with Correct alternative:- | 3 For simple cubic lattice, number of atoms belonging to unit cell a
   • (q) For ratio d is 1:0.707:0.577
   • (r) In Coolidge tube, cathode is made up of aS (Tungsten or Aluminium, Bronze or Silver, Rubidium

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