BSc Chemistry SEM III ATKT 2017-18 ATKT Chemistry Paper I Question Paper - Mumbai University | munotes

Questions asked in this paper

• 2. Figures to the right indicate full marks

1. Q3 The use of non-programmable calculator/log-table is allowed
2. Q1 Select the correct option and complete the following sentences: 12 marks
3. Q1 Fugacity has the same dimensions as ,
   • ii) The variation of with temperature is given by van’t Hoff’s
   • iii) The equivalent conductance of a solution of an electrolyte with increase in dilution
   • (a) decreases (b) increases (c) does not change
   • iv) In electrolytic conductors, ----------- act as carriers of electricity
   • (a) equal to zero (b) >0 (c) <O
   • vi) A triple bond number of pi bonds
   • vii) molecule, the atom S undergoes hybridisation vili) The energy released in the formation of one mole of ionic solid from its constituent gaseous ions is known as
   • ix) Allyl aryl ethers on heating at about undergoes rearrangement reaction which is known as
   • x) Alcohols on treatment with HI in presence of red phosphorus gives
   • (a) (b) alkyne x1) Epoxidation of alkenes is done by using
   • xii) of sodamide in liquid ammonia on p-bromo toluene gives
   • (a) only p-amino toluene (b) only m-amino toluene (c) mixture of p- toluene and m-amino toluene State whether the following statements are True of False 03
4. Q1 The transport number of an ion decreases with an increase in temperature
   • ii) Born Haber Cycle helps to determine lattice energies of ionic compounds
   • iii) The elimination-addition mechanism involves Benzyne intermediate
   • Q.P.Code : 30159
   • C] Match the following 05
5. Q1 For non-spontaneous process a) AG>0
6. Q2 unit of cell constant b) AG=0
7. Q3 Ionic bond c)
8. Q5 o-nitrophenol e) m!
   • f) double bond
   • ii) the free energy change of a process whose enthalpy change at 373 K is x J and temperature coefficient of the process is 03
   • A]i) The equilibrium constant for a gaseous reaction is 169 at 500 K and its heat of reaction is — 42.68 x J. Calculate the equilibrium constant of the same 05 reaction at 690 K. (Given R = 8.314 JK?
   • ii) | Write a short note on “ Partial molal properties”. 03
   • B]i) Discuss the factors which affect transference number of an ion. 05
   • ii) At 291 K, the equivalent conductance at infinite dilution of NH4Cl, NaOH, NaCl are129.8 S cm’, 217.4 S and 108.9 S cm” respectively. Calculate equivalent conductance at infinite dilution of NH4OH. 03
   • B]i) The transport number of H* ion is 0.847 in 0.005 M HCI solution. The cross-sectional area of the tube is 1.5 Find the quantity of electricity required to displace the boundary through 1.4 cm. (F = 96485 C/mole). 05 State and explain Kohlrausch’s law of independent migration of ions. 03 Show that decrease in Gibbs free energy at constant pressure and
   • C]i) Define 04
9. Q1 Cell constant of conductivity cell
   • ii) Conductivity of electrolyte Transference number of an ion
   • iv) Equivalent conductance of an electrolyte at infinite dilution Aji) What is limiting radius ratio of cation? How does it help in predicting its
   • ii). Discuss in brief the crystal structure of CsCl. 03 Write a Kapustinskii’s equation and explain the terms involved in it. Using Kapustinskii’s equation calculate the lattice energy of CaCO3.The radius of Ca*? is 114 pm. Radius of is 185 pm. (Constant C = 1-079 x 05 What are the conditions to be satisfied by atomic orbitals to form molecular
   • Q.P.Code : 30159
   • B]i) Discuss the importance of exchange energy and shielding effect in determining the bond energy and bond length in the formation of hydrogen molecule on the basis of valence bond approach. 05
   • ii) the basis of hybridization, explain the geometry of BF3 molecule. 03
   • B]i) Write a brief note on the concept of resonance and resonance energy with
   • ii) Write a note on sigma and pi covalent bonds. 03
   • C] is hybridisation? Explain hybridisation with a suitable example
   • C] Write a brief note on gerade and ungerade orbitals . Give examples. 04
10. Q4 Ali) Explain the mechanism of alkaline hydrolysis of tert-butyl bromide and give its energy profile diagram. 05 li) Write the reaction between ethylene oxide and
    • A]i) What are organometallic compounds? Write down the reaction between n butyl lithium and — li) Write the reactions for the action of acidified K2Cr207 on primary,
    • B]i) Give preparation of ethylene oxide from:
    • a) b) vicinal halohydrin. 05
    • B]i) What are primary, secondary & tertiary alcohols? How they are synthesized? Explain with suitable example iit) How are a B — naphthols prepared using naphthalene sulphonic acids? 03
    • C] What is esterification and etherification of alcohols? Give one example of
    • C]i) How is phenol prepared from cumene? 02
    • ii) How you will prepare the following compounds using Grignards reagent?
11. Q5 Attempt any four of the following— Explain the variation of equivalent conductivity with dilution for (i) weak On the basis of molecular orbital theory, explain the bonding and magnetic behavior of molecule. 05
    • d) With the help of diagrams explain the formation of bonding and anti bonding molecular orbitals on the basis of wave mechanical treatment. 05
    • e) What is cine substitution? Explain with mechanism. 05
    • Q.P.Code : 30159
    • f) What happens when 5
12. Q1 Ethylene oxide reacts with methanol in presence of H2SO4
13. Q2 Phenol is treated with Benzoyl Chloride
14. Q3 Phenyl lithium reacts with methyl cyanide
15. Q4 Sodium phenoxide reacts with methyl iodide
16. Q5 Phenol is treated with bromine water

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