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BoTO h.CitiI(ConStruction Maha 91mont)/BoTech`CivilVater ResourcOs Egineeng)Ternlnd Exanlination

Detember,2007

ET105(B}:CHEMISTRYTimc:3 hours Max:mum Mar s:7Nore= Alswer grr thc qucstions.Usc o/calculatOr is

a1lowed

1. Attpt any threc 6f the fon6wing: 3 5=15(a) .(1) What dO ,Ou understand by HciSOnberg'suncertainty principl 3

(li) What is thO wavelength of a phOton emittedduring a transition fr9m nh.bl=4 to,inJt=?

s in the H atom.(R=1069705 cm 1) 2(b) What are the electroniC COnfigurations a d bOndOrd9rS 9f He2,BC2 an4 N2? _(c) Calculate the packing fraCtiOi of a simp10 cubic i lattiCe 5

(d) Explain hydr6gen bonding givinC speCifiC exampleS.E-105(B) P.:

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2ttempt any thre9 0f the fOHOwing: =15(a) State third l,W Of therrnOdynamics and find the

entropy Of a substanec at 20 K if the mOlar heait capacity 6f the substance at 15 K is 007K 1.= 5(1) A sattp19 0f 350 g Of wat r is heated fro

1 0 0 5 t o 1 5 . T h e s p e c i f i c h e a t o f wis 484 Jg 1 C) 1Calculate thc heat cha,ge.

(11) Defihe``Ehtropy(1) At 27 C,a reaction hasH ` +10 kJ mOl 1and +`30 JK Llo.whtthvab

of G?(li) What do y6u indarotand by autOtal,siDerive rate cqatiOn for first Order rctiOn` 5

35155

reactiontttk9'place. 5

(b)

)

(d)

3 Attempt an rec of the fO110wing:(a) Dofine:

{1) NOrmality(li)M61arity l :(111)Molality l(ivl Mole fractiOn

(b) Explain a lDanicn cen in which the l)+CYa)'n)Cu l)

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(C) The equilibrium cOnstant for the reactioni)+C12 2gO+2 1Cl+Nia)108x1017 at 298 Ke Whathe vahe of thestandard cpotentiElen fth4is reaCtion?

(80314Kttll 1) . L :)What are buffer sdu ons?D ve HendersOn's

cquatiOne 1 1 5

4Attet any:0f the fo110wing: b7 ,allLll]::::i111illFT )bl :(b)WntC IUPAC hattes Of the f6HOwing: 5' (1) PtCl:l

(li) ICo(en):I C13 : : (lil)K21Cu9141(iVI Cro)4CICl l

. (VI IPt(NH3)2(N)21 1(c)Wh l do y9u inderand by`Hard"ater'?LiSt

. different methods used tO makc hard water sott aAdi eXplain any 9n of theme r5

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5. Attempt any threc of the fo1lowing:(a) Write the structures of

(1) 3-mettyl-2-butanOne(li) 2,3-dirnethyl hexane l(lli) 2-rnethyl-propanol(lv1 1,2-dirnethyl cyclopentene{v1 3-chlorobutanoic acid

(b) Explalh ho"soap helps to rove grea,y matialsthOugh they arot `ub19 in Watere 5( c , W h a t t p e t b y k n O c k n C ? w n t O t h e

tackle this problem.(d)What is the centrJ dOCma of Lcdar bi910gy?

35=155

E-105(B) 3,000