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

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1 No. of Printed Pages : 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 : CHE-1 : ATOMS AND MOLECULES AND CHE-2 : INORGANIC CHEMISTRY Students registered for both CHE-1 & CHE-2 courses should answer both the question papers in two separate answer books entering their enrolment number, course code and course title clearly on both the answer books. Students who have registered for CHE-1 or CHE-2 should answer the relevant question paper after entering their enrolment number, course code and course title on the answer book. Note : Answer all the five questions. CHE-1 1 P.T.O.

2 Use the following data : Planck's constant (11)= x J s Velocity of light (c) = x 108 m s-1 Mass of electron = 9.1 x kg Avogadro constant (N A) = x molt CHE-1 : ATOMS AND MOLECULES 1. Answer any two parts : 1x2=2 If n is equal to infinity for an electron what will be its energy? The first ionisation energy of Be is higher than that of B. Explain. (c) State the selection rule for a molecule to exhibit rotational spectrum. 2. Answer any two parts : 2x2=4 Calculate the molar polarisation of carbon tetrachloride at 293 K. If its dielectric constant and density are and 1.60 x 10 3 kg m3 respectively (Molecular mass of CC/4 = kg mol -1.) A gaseous molecule is exposed to the following radiations : Infrared Ultraviolet Indicate the type of energy, changes brought about in the molecule. (c) The Gyan Vani channel of IGNOU broadcasts at a frequency of 105 MHz. Calculate the wave length of the radio waves. 3. Answer any two parts : 3x2=6 Write the molecular orbital configuration of F2 and 02 molecules and comment on their magnetic behaviours. Predict the structure of SF6 molecule on the basis of valence bond theory. (c) How many normal modes of vibration are there in the following compounds? CO2 SO2 (iii) CHC13 CHE-1 2

3 4. Answer any two parts : (a) An electron is confined to a one dimensional box of a length of 1nm. Calculate : the energies of the ground state and the first excited state. 2 the wavelength of the electromagnetic radiation required to cause a transition 2 from the ground to the first excited state. (b) (i) Which of the following will show absorbance in the IR region? 2 H2, F2, NO, HC/. Give reasons for your choice. (ii) Which of the following can exhibit optical activity? Give reason for your 2 answer. CH3 CH (Br) (Cl) CH3 CH2 Br (c) (i) State Beer - Lambert's law. 2 (ii) 238 U disintegrates by emitting an a-particle followed by a 13-particle Compute the atomic number and the mass number of the resulting nuclei. 5. Answer any one part. (i) State two structural aspects of similarity and dissimilarity between ethylene 2 and benzene. (ii) The rotational constant for 12C 160 is m -1. Calculate its reduced 3 mass, moment of inertia and bond length. (i) Calculate the de-broglie wavelength associated with an electron having 2 velocity of 1000 km s (ii) The half life period of 27Co is 5.26 yrs. How long time would a sample of Co take to reduce to 12.5%? CHE-1 3 P.T.O.

4 ( ) 1: faj1-9. Th7V4-1 Li 4, I I 1kt atit : 7 72T 37ftlohlg 3: 25 trftrit : th I ul ii * : (i) 3?. -2c1 Wc qj-1. (t-?ff dri rf yr-t7t3ff aufw ailwafw,wd q I 17 (11< q 4) 111IH ith7tf sly Fft.q.q.e.-iT &.qr./...-2 f77# k/ q., v et, afft diy dri-yr??1t7 tr TrifT, 4/c5, q UM. (IN, TTT"--- q/97 fc1licht Fr4 eq. 377-q-?" dri1 q7r,/q / CHE-1 5 P.T.O.

5 k 39 r^w c-,r(on r : kg 71f-T 00=6.626 x J s 3T (14 (NA) = x 1023 mol -1 I f (c) = x 108 m s : 1 x2=2 Q,:*) TWA' 6-1,irf Tf{T 1 4 1? Be 3T 2Tif 3{1z1-1-i 3 oif B 3*-41, i (c) f*-7:1 39.* 110f9.q.qtr4fart cr u r f9--qtr 2.,YR" : 2x2=4 293 K 'TT ohnsfi 41,4:-15 T VuT -If-47I of "LRIcqc11:41 9b 4-M: x 10 3 kg m3 t I (CC14c: = kg mot -1) I r R.1 141(1 Fol k-wilt :.-R gp f 39 d 7-*-1T.q-d.1 I (c) arm -;1-1c,r 105 MHz ITT Skilt u f T t I Ti 'tft-zh ciolf chet di 7 r f eft -)fir 3. T2- t 671.). FAQ, : 3x2=6 F2 A.{ , TUT fd774- 'fri t -qq A-74 (>4 c11( -97 I,114tT 'PR751ff : ITT SF frff chi A7 (c) F-1 4-i fir+51 tffm--*4 T1 f-*t-dt fdttfl '6)41. CO2 SO2 (iii) CHC13 CHE-1 6

6 4. '474 3rlt q11-sti : (a) 1 nm Bch RH-1r qr fi -7* Tif fft fii-iroracr '1 kii : TqWf her d,T1c-f 317T-P-TT I ,31c-f 31qmr t N H U I -11 TIT * J.: ?rd fad e 2 rcrichor* I (b) F-p--iroR.g cf *11 317T4l -) '77 74It Pi(? 2 H2, F2, NO, HC/ i-)1( r I certod 4-4 *r9--4,11 1-).& t? 3l 3t1( chi( r 2 '1F,3-R I CH3 CH (Br) (C!) CH3 CH 2 Br (c) fa7414 r" Ur r c u- ch u r,-h(1.3-q-) rtf tifft t I 5Ilti iif t cit.!: 2 TF49 (-R9.,-Ir TT Li 4.onc-i-r 5. fr7 qq, 941TT (a) (i) 4.-11F-311 Ti t 1( t -q-d147 I 2 (ii) 12C 160* ft-q#w m t I 5Trk '1 ca TqN I (b) (i) zffqq km s lt 4 4 Icf I 2 (ii) 267 Co 'W ifa 5.26 tl 267 Co.Wf Q,* izitit1 12.5% ci* 3 CHE-1 7 P.T.O.

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