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NATIONAL INSTITUTE OF TECHNOLOGY, KI]RUKSHETRAEND SEMESTER EXAMINATIONS, NOVEMBER/DECEMBER 2012

Programme:Subject:Course No.:Time allowed: 3 Hours

Roll No.

B. Tech. I SemesterChemistry-ICHT-I05 (Common with CHT-101and CHE-I01)Maximum marks: 50

Note: (1)(2)

Unless stated otherwise, the Symbols have their usual meanings in context with the Subject.

Assume suitably and state additional data required, if any.

Before starling to write the solutions, the Candidates are mandatorily required to check the Questionpaper for

"ny di..r"puncy ancl also ensure that they have been delivered the Question Paper of right

Course No. and right Subject title.

Attempt any five questions. All questions carry equal marks.

Justify yor. urrr*ir(s) with suitable example(s)/chemical reaction(s)/neat, cleaned and

labeled diagram(s), wherever applicable.(3) You are mandatorily required to write your Section on the top corner (RHS) of your

Answer Sheet.(4) The question paper consists ofeight questions and is printed on both the sides.

i (a) What'are second order reactions? Mention their two salient characteristics. Derive an expression

for the velocity constant (k) of a second order reaction when the concentrations of both the

reactants are different 6

(b) The rate constants of a second order reaction are 5.70 x l0-5 dm3 mol-' s-r and 1.64 x 10-4 dm3

mol I s-' at25'C and 40 "C respectively. Calculate the activation energy (E ) and Arrhenius pre-4exponential factor (l).

II (a) What are reversible electrodes? How is the calomel electrode represented? Under what condition

does the chloride ions concentration increase in the calomel electrode?

ORCalculate the pH of the acidic solution in the following electrochemical cell:

Hg, Hg2Cl2(s); fCt (saturated solution) ll H. lunknown concentration); Q, QHz, Pt'

iftie values for the EMF of the above cell, Eo"u1o*"1 and Eo6{a,aq, are 0.26, 0.24 and0.70

metals (with the exception of noble metals)

theory of wet corrosion of iron with the6

4respectively at 25 'C).(b) What is meant by corrosion of metals? Why do the

undergo corrosion? Explain the electrochemicalabsorption of oxygen.

III (a) State and explain the photochemical reactions and the reverse of photochemical reactions with

suitable examples. Discuss any two points of differences between the photochemical and the dark3reactions.

(b) Define the term spin multiplicity. With the help of a Jablonski diagram, explain the phenomena offluorescence, phosphorescence, internal conversion, inter system crossing, radiative and non-

radiative transitions. 7

IV (a) State and explain the following terms (any five): Phase, component, degrees of freedom,

metastable equlibrium, transition temperature and enatiotropism. OR. Discuss the XRD method used for the.characterizalion of a given nano material. 5

Rest of the qyestions ure orinted on the bu?k of this sheet,..

Sheet No' 2

(b) Draw a neat, cleaned and labeled phase diagrarn of suiphur sYstem' Explain the various Phase

equilibria and triple points involved in it'Answer

$1",,ii[!"r:"jl|Ii:%g},i]J|l;*",",. oronry amino acid containing no rree a-amino and

carboxYlic acid gouPs'

(ii) wrlt" trre nam" irrr",L reactive functional group present in co-enzyme A'

(iii) Write the number of pentose *" "'J'fr" nf'osphoric acid uniti individually present in

ni cotinamide adeni noiine dinucleoti de (NAD)'

(iv) Write t6e mathematical fo.*uiu'ion of t"iu"td phase rule equation meant for two

(") i;lllT:,,:'"Htl?or" metallurgist who introduced the term eutectic in two components

(vi) H,:iffi,. Haworth p'ojection formula of either o-(D) glucose or p-(D) tructose' 5

Discusstheformation,orderofstabilityarrdorbitalradicals and carbenes.

structure of carbocations, carbanions' free

OR

Discussindetailthegeneralmethodsofsynthesis,importantmethodofthecharacterizationandthe important inOu"'iit or technicai uppiitution' of nuno materials' 10

vl(a)Howdothephospholipidsdifferfro.mthetriglycerides?writethenameanddrawthestructureofa triglyceride possessing two palmitate and one stearate moieties at the primary and secondary

carbon atoms respectively of glycerol molecule' -:^r"+ ^hoih ,ll,qnoic.

4

(b) Write the IUpAb nams and-draw-the structure of a straight chain alkanoic acid which upon

responding the p-oxidatio' in u".ordun." with the t<noop:, theory Produces"two molecules of

acetic acid as the end producrs. :urtiffiu, answer with uliimate B-oxidation of above acid' 6

vll (a) what are the coordination compounds? Mention their two important applications' Answer

following in a Tabular Fom:

Charge Presenton the

coordinationsohere

bxidation number

of the central

metal sPecies

Nanie of the coordination

compound

Name ofthe. Lewisacid

Name otthe Lewisbase

: ^1,^t /n\I J

I elraaquasupl]I;t\rr.,Potassi um hexacyanofbrrate( I t I )

(b) Discuss the paramagnetic behaviour of an outer- and iner orbital- octahedral co(Ir! coordination

OR4

the6

comPounds.Explain the crystal field splitting of d-orbitals in an octahedral environment'

VIII (a) Name any two modern techniques used in the structural elucidation of compounds'

S^' reactions occur with the retention of configuration' Why? ^ ,

(b) Discuss the terms: chemical tt"tit, shieldlng.*and deitrietding frequently used in

spectroscopy.dir"r$ thekinetics of the photochemical formation o?HCl'

(c) Write short note on UV-Visible spectroscopy'

DiscussthephasediagramofPb.AgSyst€mwithspecialemphasisonimportance.

OR2

NMR

OR4

ORits rnetallurgical

4