BACHELOR OF SCIENCE (B.Sc.) Term-End Examination December, 2011 CHEMISTRY CHE-04 : PHYSICAL CHEMISTRY

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1 No. of Printed Pages : 12 BACHELOR OF SCIENCE (B.Sc.) Term-End Examination December, 2011 CHEMISTRY CHE-04 : PHYSICAL CHEMISTRY I CHE-04 Time : 2 hours Maximum Marks : 50 Note : Attempt all the parts. Answer five questions from each of the parts A, B, C and D. PART - A Answer any five questions : 1. What is the S.I. unit of density? 2. Define molar enthalpy of vaporisation What are semiconductors? CD - C) 41' 4. CD Define molality of a solution. 1 IN) 5. State Le Chatliers principle Define equivalent conductance What is the effect of temperature on adsorption 1 of gases on a solid surface? CHE-04 1 P.T.O.

2 PART - B Attempt any five questions : 8. Write mathematical expression for most probable, 2 average and root mean square speeds of molecules. 9. At room temperature, which of the following will 2 have highest surface tension? Give reasons. H2O, CH 3CN and CH 3OH. 10. Find out the ratio of the volume occupied by the 2 atoms to the total volume of the unit cell of a simple cubic cell. 11. Define eutectic for a two component system show 2- using phase rule that at constant pressure, eutectic, is invariant. 12. Given that K sp of PbC/2 is 1.6 x Find out its 2 solubility in water. r0 13. Given that I- = Fe 1Fe 0.44 V 2 E0, = Cut ' 1Cu Can CuSO 4 solution be stored in an Fe-vessel? 14. Define photosensitisation with an example. 2 CHE-04 2

3 PART - C Attempt any five questions : 15. Write equation of corresponding states, and define 3 reduced pressure, reduced volume and reduced temperature. 16. State Hes's Law of constant Heat Summation. Calculate AFf' for the reaction C(graphite) (g) CO 2(g) at 298 K. Using the following thermochemical equation C(graphite) + 0 2(g) CO 2(g) 6,11 = -393,5 kj CO(g) + -i02(g) -> CO 2(g) kj 17, Using first law of thermodynamics, derive an 3 expression for work done by the system when n-moles of an ideal gas are expanded isothermally and reversibly from V i to V Derive integrated form of Clausius-Clapeyron 3 equation for vaporisation of an ideal gas. CHE-04 3 P.T.O.

4 19. What is distribution law for a solution of solute in 3 a pair of immiscible liquids? Name three factors it depends upon. 20. Draw a labelled phase diagram of sulphur Define transport number. Explain one 3 experimental method in detail for its determination. CHE-04 4

5 Given that PART - D Attempt any five questions : 22. For the reactions : 4 Cl2(g) + 2N0(g) ----> 2NOC/(g) given that [C12] 0 / M [NO] 0 /M Initial Rate/Ms x x x Calculate order of the reaction with respect to each reactants, overall order and rate law. 23. At 478 nm, H2 and C/ 2 combine to give HCl with 4 a quantum efficiency of 1 x If the absorbed intensity is 2.5 x 10-3 Js -1, calculate the amount of HC1 formed in 10 minutes. 24. Write short notes on : 4 (a) emulsions and (b) colloids 25. Calculate the equilibrium constant at 298 K for 4 the following reaction : Zn NH3 = [Zn(NH 3 ) CHE-04 5 P.T.O.

6 E0, = 0.76 V ; Zn-+ IZn E0 [Zn(NH3 ) 4 12+, NH3 1Zn = 1.03 V 26. Assume that an ideal gas undergoes isothermal 4 irreversible expension and is in contact with a heat reservoir inside an isolated system. Given that heat absorbed by the gas under isothermal irreversibly condition is 2.37 x 10 5 J and heat change under reversible conditions is 7.47 x 10 5 gas (b) heat reservoir and (c) the isolated system as whole. at 300 K. Calculate the entropy change (a) the mol of an ideal gas at 300 K and 2 x 10 6 Pa is 4 expanded reversibly and isothermally till its pressure is 2 x 10 5 Pa. Calculate Ay, q and W. 28. What are azeotropes? Show using the 4 temperature_composition diagrams that azeotropes can not be separated into pure components by fractional distillation. CHE-04 6

7 711: a qui CaVi ft.) *Nil Titan 2011 tt4lt4 1 I ci X1 11 1: : 1.1rdW %Wig : 2 alfgrwffq 3 - )2. : Fr* TO,* dzy 57rok ri rn --* w A- Fr F). Skvj * q7rin i vrtr 3o-tr dru : tilc-cf T SI Jim" SIT t-? am 4 14Ḵ{ 7-4-1ft 4 trftitri-erd wir- R i Ttf-AWPF,49T4 t? 1 4. :rwiri Riogri -1- tiloopi 4 Trfrzusrt cli,,r AFFR T i-nil furtir r 4- mucicnii *4 trftwerr -r- fa-r fir?.aki 75 cr{ W.-ft.-T aftto-ercrr wrq dt 1 *1 Pbt-I mctlit 314Traff ill' t? CHE-04 7 P.T.O.

8 vut ft77 rft TR** dtv %;// : 8. 3-T014 I qcf-k1 1-1, 3t717 "Ii t rc-r f7ft17 9. cilli 1: ( Fmii,i # 2 31-N :?lilt? ' d- q7 H2O, CH 3CN AT CH 3OH. 10. f- 7: zr '71= TTI felt 3-IT 2 t 31d 711c, tlfa7 11. fgera- 4,4 t rci 1-41) Trffrff -q-rq- -WT 2 fizrq t 747 -gru ra-) ft-q-t qitvi '1 f~ldl t fzlt fi Pbc/2 t Ksp sh1 HI x10-5 t I 2 AO 14 77*1 FIC)q(-11 ltd 1f I 13. fq-zrr t Fe - _ IFe = 0.44 V 2 E0 Cu+ l icu = +0.34V W-11 CuSO4 fay Fe--4 t-ila.17 IT t? 14. WT t+,10chtul ct) t*7 1:0:Wfisrff CHE-04 8

9 vrtr 'Tr' ft 47 Off mq-f drh G7rvic : 15. trier 374T-gr3 r t-$41ci101 ffffti7 3 W qltsi di 3 *P-11-11c1 114 eft WWR I 16. #1 WI f2t7-d)u-if- fi-tn7 I 31filfiT 3 C (tieftm + 0 2(g) ---> CO2(g) f mi 298 K TIT zifr Hfiebrocr Iw:r 1: sl,uitrinpict) choir' WI Tr*i t : C ( tcht4z ) + O 2(g) --> CO 2(g) ArH = kj CO(g ) 1 02(g ) CO 2(g) Ar1-1 = kj 17. d)tivirocbl * 1;( v-p-1w 17z4Ticr) gm 1 3 TR chl4.0f-a7 n TtiR 3TrO -11-u t dubliu1141 'FT "A altzrifff v 1 3iTzrdff v2 7W Wit( (4)01 t 18. f*711' qfrricrzrḡ- 3 'Wr tv-iicbrocr TIT 9-0:R "W1177 I CHE-04 9 P.T.O.

10 fl. it4 -Tf fl-tw4 TiT 3 crul PtolTf I? 7(7 FA mf if4 9-4 ` ob t (-11 t ` t rsi 20. 7:4*) fc-ff7 k- lfff7d,71-f-9-tt o H-1 Cob 4-,fro--INT RTR fiqkcir 3 fci-fet -4f1 Fri coi WY-11 -f,,17 CHE-04 10

11 WM `l ' 31q-i7' dth OrvN : 22. afilftzft : 4 C/2(g)+2N0(g) > 2NOC/(g)* tr, t-zn. t : [C12] 0 / M [NO] 0/ M VOS jr /Ms x x x fliffT s1211 (4 3Tfilfwzrt.T)tT Lifichol 3 fi.72ft tfu nm ITT \71-1 3t{ TOM T17- tf i aliem k.rat 1 x 10-6 t-,-irc 'ffEra. tm. 2.5 x fi:19z fafgh 7d7R i 24. P-P-irciii5i Tfrucff fa-opfi : 4 (a) Li V1 (b) CHE P.T.O.

12 K TiTrzi 4 Lirtch01.41 A7 Zn NH 3 = [Zn(NH3) 4 ]2+ 54t1)'1 : E0 Zn-+ IZn = 0.76 V,NH3 1Zn = 1.03 V II-11W 370 'TT 311w:ruhr t 4 cif--*-141romilid -q**-t ti rqqr t f ith 3w-erPt FifErff d,u-if 2.37 x 105 J t Trft-q-49, dcsbil 3T4TP1T x 10 5 J t I T9' 31f-q:) ('W) ("U) `1-1t7 (Tr) Tfrk-uf racipici tl'swr Lifichroci WA7 I 27. f 37-0 tltr *too -1. st K 3-17 qlq 4 2 x 106 Pa PTI I 3.t. 3c g 3th ki4-r x 105 Pa 7'4 clot -51-7Tft7 rchtii Av, q 3trt w 11"rff 4fichrclo --r A7 I 28. -ft:9-7 qq1p-11 frfq-ur t? cm)** r-coll 4 giti ft:27-4erreft frmit TriTft 317r4i -FT -rwzrr qr tichal t1 CHE-04 12

BACHELOR OF SCIENCE (B.Sc.) Term-End Examination June, B.Sc. EXAMINATION CHE-1 : ATOMS AND MOLECULES AND CHE-2 : INORGANIC CHEMISTRY

No. of Printed Pages : 15 00881 CHE-1 BACHELOR OF SCIENCE (B.Sc.) Term-End Examination June, 2010 CHEMISTRY CHE-1 : ATOMS AND MOLECULES Time : 1 hour Maximum Marks : 25 B.Sc. EXAMINATION Instructions :