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CHEMISTRY

TUrffi fdaH(313)

(trfren mr frr q ftriq )

Signature of Invigilators :

(PtfternT * rsemen)

Day and Date of Examination:

'Ihis Question Paper tsooklet contains 30 questions and 12 printcd pages.

Roll No.e|ilrqiq'

Code No.qle i. 56/OSSft

set/tztr

L.

2.

Gencral Instructions:7. Candidate must write his/her Iloll Nurnber on the first page of the Qucstion Paper'

Z. please check the euestion i,aper to veri{y that the total pa[es una tota] number of questions containecl.in

the euestio, rufr. uru the sunre as those printecl on tlie iop of the first page. Also check to see that the

questions are in sequential order'

3. Making a.y ictentiiication mark in the Answer-Book or rvriting Roll Numbcr anywhere other than the

specifiJd piu.u, will leacl to disqualification of the candidate.

4. write your Question Paper Cocle No. 56 / OSS / 1, Sct - A on the Answer-Book'

5. (u) The euestio., prpl, is in EnglishTtiina medium only. I{owever, if you wi-sh' you can answer in any

one of the lang,uages listed below' :

English, Flinai, Ur:ar, prnjabi, Bengali,'Iamif Malayaiam, Kannada,'Ielugu, Marathi'Oriya' Gujarati'

Konkani, Manipuri, Assamese, Nepali, Kashnriti, Sanskrit and Sindhi.

you are ,"q"itia to indicate the language you have chosen to answer in the box provided in the

Answer-Book.(b) If you choose to write the answer in the language other than l{indi and English, the responsibility

for any errors/mistakes in understarrding the question will be yours only'

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r6rrqr qrlmteTqfi Ttrr-gfEhqr vT vs4-* m qts i. 56 / OSS / 1, +e - A fale t

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(rc) rrR snq tfi \,s siffi + s{ftfuffi ffi eFq r+rcn if rt-r ftrs} t, n} syfr q} rrErs} { E}i qrd

ZE-d/rfiftFl1ff ftr+qn1 #+a snrrff trfrt

1..

2.

3.

4.5.

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CHEMISTRY

WTr{I;tfuIq(313)

Time : 3 Hours]Htrq : 3 uut]

[Maximum Marks : 80

[qnf-* : soNote : (i) All questions are compulsory.

(ii) Marks allotted are indicated against each question.(ii0 Each question from Question Nos. 1 to 10 has four alternatives - (A), (B), (C) and (D), out of which one

is most appropriate. Choose the correct answer among the four alternatives and write it in yourAnswer-Book against the Number of the question. No extra time is allotted for attempting multiplechoice questions.

(i") Use log tables, if necessary.

fttu :(i) qrft vni * sil{ {ftrqr(ii) sr#*':rr+ * srq+ BF+ siq, qflt+ rrq tf(iii) sr{ {i@r r i ro{ y:#* :nra i qrt fu*tq - (A), (B), (C) aen (D) t, furi t fr* sqi 3rrgffi tf qrrf

fueu} { + s6 Ert gi nw erq4 Ytr{-gRnr I qrq rirm * Err} sil frrdr qgk+eft *r+ * nAoTftFft glrq qrfr *qr qrftnt

(iv) qR errqvqo t1, * Eirr *+a qr sdrr qir

1' .The momentum of particles associated with deBroglie's wavelength of 1,,i,(h = 6.6x10rakg m2s-1). tll(A) 6.0 x 10-23 kg m sec-r (B) G.6 x LO-24kg m sec-r(C) 6.6 x 10-23kg m sec-l (D) 5.6 x LO'24kg m sec-rirur irr t-qffi 1A. t Er.Fl ri+rr t (h = 6.6x10rakg m2s-r)

(A) 6.0 x 10-23 kg m sec-r (B) 6.6 x 10-24kg m sec-l(C) 6.6 x 1023 kg m sec*r (D) 5.6 x l0-24kg m sec-r

2. The number of spherical nodes in 4s-orbital is tll(A)4 (B)l

, (c)2 (D)34s-mqm { YHq ffi & {6qr dfr tr(A) 4 (B) 1

(c) 2 (D) 3

56/OSSfl-313-AI G-sz 21|||iltffiililil|ililfltilililililil|IiltilflItffitffi1ililil||ililililil

r cond

3. The values of Van-der Wall's constant 'a' for the gases 02, N2, NH, and CHo are

1.360, 1.390, 4.L70 and 2.253 Lz atm mol2- respectively. The gas which can

t1lmost easily be liquified is

(A) 02 (B) NH,

(c) N2 (D) cH,

02, N2, NH3*r CH. nTfr * ftTq eisr qrw ft-enia 'a'FqvT: 1.360, 1.390, 4.170 efr{

2.253 Lz atm mo12- tr q,,t+ rft ts srdlfer*. snsrft t EF{d 6 qmfr t(A) 02 (B) NH,

(c) N2 (D) cHo

4, Capillary action of the liquid can be explained on the basis of its tll(A) Surface tension G) Resistance to flow

(C) Refractive index (D) Heat of vaporisation

fe ff afimfr fr'qr m ftq enern w qstq fuqr qrf,I tt(A) sq, irrrcr (B) ife * YErE { sfrrtq

(C) erqrdqifi (D) EtTGtd ff wr

5. Among the following pairs, the one representing a conjugate pair of an acid and

base is: t1I

(A) CH3COOH and CHTCOONa (B) NH4OH and NH.CI

(C) HrO and HrO* (D) SO, and HSO;

ffifua ff t t qq, qt.sr rr* erm efrr em trl ri$fr *gr tt T€ t(A) CH3COOH 3ft CH,COONa (B) NH4OH *r Nnoct

(C) HzO sfr( HrO* (D) SO2 efrt HSO;

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rContd .

6. The relationship between molar conductivity and specific conductivity is tU1000(B) A,"= C

CxK(D) A, =1000

nilf,{ qrdqaT s{h Fdfrre qrnq,dT t *q it +iaieT tm t

1000(B) A,C

_ CxK1000

(c) A, =K x 1000

(A) A,n=K.ry

C(c) A* = K"looo

1000(A) An,=Kx L̂

(D)nm

7. Which ion gives coloured solution

(A) Cu*

(c) Ag*

qt+ qr snrFT rrftq F{fifi tcr tt(A) Cu*

(c) Ag*

Which one have more negative

(A) Rb

(c) Li

fus qr E'eTfto, xqrilrm tdr t(A) Rb

(C) Li'

tlI(B) Znz*

(D) Fe2*

(B) Znz*

(D) Fe2*

8. value of Eo tU

(B) Cs

(D) Na

(B) Cs

(D) Na

G-52 4s6/ossft-313-AI IContd......

9. Which of the following is not nucleophile?

(A) CN-

(c) NH,

ffifu? fr t 6trqT qrft6 c6 Ts tm tt

(A) CN-

(c) NH,

t1I

(B) OH-

(D) BF,

(B) oH-

(D) BF,

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10. + NH, A is: t1I

.A-zNH(A) (,

-^--zM'(B)l I

\-/

,"rryNH,a ,'--*P

(D) (,

F€ srftfu A tl

3,o(, +NH,=- Ais:

,^,d(c)

56/OSSft-313-AI

,nrNH'(B)l I

\--'-

NH,

/\,o(D) (,

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20

NH

NH

5

L2,

11. What mass of calcium will contain the same number of atoms as are present in3.29 of sulphur (Atomic mass of S = 32 and Ca = 40) tzt

3.2gveu"t t wrm {rgr fr sqft'tm qcn1lq} t ft{q effiHirq tnT Eaqrnq wr drnt(vtrrEEqqrrS=32efuCa=40)

Give the expression of reiative atomic mass and relative molecular mass. 121

rntu qcnq EqGrH o{t{ nrtr snqGr*, EqqH * Ega{ft Afugr

13. Give two properties of stationary states as proposed by Bohr in his atomic theory.

Izt

+t ff qanurdq ftrEia t fr G frifl sffi€en + A uur {ftet

L4. State Heisenberg's uncertainty principle and express it mathematically.

Er$ffi sfiF"rndr ftr6h ftTfuq eft *rm ttffiq sq ftfuet

15. a) Why is lyophilic colloid more stable than a lyophobic colloid?

b) Why does the sky appears blue?

a) Ei-d{rrfr qtdr5e Ee Fdwfr qtdflEs ff ertefi erferq, rff a{il dt tib) s{r?6'r$ *fir qqf M tm tl

L6, Why are detergents advanmgeous over soaps? Why are straight chairt hydrocarbon

tzl

t21

detergents preferred over branched.

sTqqrdq, rrrgeT + sTf*n ffi RT d+ t? vrfuE ElEdffirdr snrrrof-n ff ettefixsriqfT af$qrdeI etqmdql qfr trqr qrn tt

t21

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s6/ossfi-313-AI IContd......

17, How do thermoplastics differ from thermo setting polymers? Give one exampleof each. t2)

qffis EEtrdr rxmdfu qg-i{qit t ft6€ rrt6n ftra dt t t s-** q..r gn. sqrrrur frF"re r

18. Compound (X) is known as king of chemicals. When compound (X) is addedto the blue colour hydrated CuSOo it blue colour disappear. Identify compound(X) and give its structure. 12)

qtfirn (X) r€rq* irT TtctT Er{flrilr tt qe dfus (X) q1fr i'r * srer*ft6 CuSOo *'qrer ftri{rqr qmr t H} srd, *fir trT trr+E fr vmr }1 dftm (X) fi rrdtnd ffFdq e*rsrfr qtT{r {Fqet

L9. How is the heat of formation related to the stability? Which of the two isomers ofbutane is more stable at 25"C.

AH, (nbutane) = -120 kJ mol-' and AH, (Isobutane) = *129.8 kJ mol r l2l

{traq sqt frm rmt rur$ra * mmif*a tt aX*+ + * Hrrr+{q} qlq sr erfBrq lglr$

25'C tt AH, (n tizal = -120 kJ mol-' or AH, (aTEdrqh) = -129.8 kJ mol-'

20. a) The boiling point of water becomes 100.52'C if 1.5 g of a nonvolatilesolute is dissolved in 100 ml of it. Calculate the molecular mass of thesolute (\ for water =0.6 Kmol-l)

b) Calculate the temperature at which ice will begin to separate from a mixtureof 20 m€LSS percent of glycol (Cr{Or) in water (\ for water = 1.86 Kmol-')

t41

a) qR t.5 g erqrEqvftfl ffiq q1 tOO ml qrfi { Eiltn qmr t * qrfi ifi"r €efii6100.52'C S wmr tt F*tq + snurF{n qqrrn d qfimftffi Serq (qrft t ftrqIq = 0'6 mol-')

b) stT flTq a1 qffifr ffeq fte w (C2H6O2) 20 EqqH qftrsfr rirr$frfn t rrrfi {fr:rur t E+ serrr d Erfr t (qr* * ftrq Kr = 1.86 Kmol-')

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21. What is Zero order reaction? Give two examples.

In a first order reaction the concentration of the reactant is reduced to one fourthof its initial value is 50 seconds. Calculate the rate constant of the reaction. t4l

qF?T n)ft ff er&frzn Eqr dfr t? A y{rdrur {ftrq

serq q1fr ff sTeft.in fr 50 niid + e+ftrmffi * Hif{r }nr&*. rrn t f'* elerr$ 16

lrrfr tt e{Fr&-qr * qt ftrriq, q} rrfimfua ffftrqr

22. a) How would you determine the standard electrode potential of Mg2./lvlg?[4]

b) Can Eo cell or ArGo for cell reaction evern be equal to zeto?

a) Mgr*/lvlgqn IIFII5'Eeqrrs fuTd. Grq vq"n ffiiil

b) H.r tfl sTFrfr.qr * ftrq E'" +a qr ArG' 6$ YIq 6 va-m t?

illliltiliillilililtilill iilililtil tiil iilit iilil ilill

23. Explain the following. 14)

a) PbO2 acts as oxidising agent why?

b) Lithium forms only oxide but sodium form peroxide also. Why?

a) PbO2 errede,rcfi * so { u,.r{ a,rn t R} ?

b) iftfu€rq *{6{ qiffir$s EFTkrr t *f*a Filkq vt eriaqrfe rft q+mr tr dl

24. What happens when? Give balanced chemical equations.

a) Acidified solution of KMnO* reacts with HrO,

b) O, reacts with phosphorous.

wr tm t q-{fu? {igftla rrs'qfrs rr+*,,lur frFwqt

a) s{r-irr5-il KNinOo iaffrr HrO, rF vrsr s{frTrdrrr qrrr ib) Orwr*uatw * srE s{nfu q,,rfr t

t41

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25. a) Arrange the following in order of increasing basic character

RNH2, R2NH and RrN

Justify your answer

b) Haloalkanes compounds are more reactive as compared to haloarenescompounds why?

Vla) ffir&n atr ..-t Eq eTrfu Fq fr qqftm ffFsq

RNH2' R2NH ah RrN

sTrFT sin qT efrfue {fqq

b) Htt{ *m ff gr*r q tffia *tu6 eTf*n ffin fi t I d ?

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26. Calculate the bond enrhalpy of N-H in NH, (S) 14)

t?Given , *r,t,

* irrft>

-+ NH, ; (g)D , H" - -46kJmol-r

] *r<rl + H(g); LrHo= 2l8kJmct-r2 z\!

1

in,,r, + N(e); Artf - eT3kJmot-r

\I}l,(g)fr N-H ff errcisr (ffi e1 rrfimrfta #ftTq

l?ftqr t , n, ttl * irr(g)

-+ NH3;(g)DrHo = -46kJmol-l

1r,trl -+ H(g); a,rHo -21SkJmor-r21..

1

,*rt*l + N(g); ArrP - 973kJmol-'

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rcontd

27. a) Write down the IUPAC name of the following complex. [Co (en)rcl,]Cl

b) Draw the geometrical isomers of [Cr (en), Cl2]*

c) ;CoFuJ3- is paramagnetic whereas [Co(I.{Hr)ul3*is diamagnetic. Explain onthe basis of V.B. theory.

d) What is oxidation number of manganese in KMnOo?

t6la) ffiftn Ti$m m errg s fr q rft * eqrrn;nq ftfuq [co (en)rcl2]cl

b) [Cr (en), C12]* * enftrftq {rrflErqEr r{rgq

c) JCoFul3- rygqe{ ftr t wcfu [Co(NHr)ul3* rftgrrfrat r6qqtrcmr enziqftAh *' enern rrt quh fiFurqr

d) KMnOo{ ffiq ff efiE+ftsrur {6qr qq,r dfi ti

28. a) Although C-Cl bond in CCI- is polar but it has zero dipole momenr why?

b) What are intermolecular and intramolecular hydrogen bond. Give oneexample of each.

c) write down the canonical structures of sulphur dioxide. t6l

a) qErft CCt4 { C-Cl endq ?fmq ftr t +Ril ETq.r Efe sn{ot yf;q *n tr qfri

b) eintreqm oih siilrcTgm EfSfi entiq eqr tt t? !r+6 al ltir y(r6rur fiftrqr

c) rr€tnt srfuiffirSe # *.nfrqia ffi ftfuer

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29.

LiAlH. > B

HrO

?c) H,C _ 6 + H,C CHO-#%r-rcH

OH

,lil IJ-LT/\I rl dilHNO. , r,d) | ll --Zs8K--D*l ll\_/-/ \a_-NO,

A, B, C sfu D * qtrqrq ftF'dq 3*r r{* srr$ s fi q * * ergvn qrq ft{fuq:NH2

Oa) + 3 Brr(aq) * A+ 3 HBr

L4lH. * BHrO

Oc) H^C_f+H,CCHo-.*ffi..+c,lH

Z\ ./---d)f' jl ry.--',*a'll\--l V

b)

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t6I

s6/ossrt-313-AI G-52 11

30. a) Give simple chemical test to distinguish between

i) Methanol and ethanol

ii) Ethanol and ProPanone

b) How will you cany out the following conversions

i) Benzene to toluene

ii) Propane -1-ol to ProPanal

c) Explain Reimer Tiemann reaction with example.

a) ffifuiT t fr+q m-r+ + fte Erm rrsrqfto qfrerur fiFdq

i) t+na eft qerr+n

ii) qenta eft *++t+

b) enq ffifua Gqnrtut Aat Ett?

i) ffi{ t zftt{i

ii) *Ar- l-qfd + *d+n

c) rrgm-zlm s{FTB.qr iil Ydrflut qtrd quiT ffFqql

lflilIffi [[lilil]fiiililililIffi flilIflilfil lfl fiilnilffi [[

t0t

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I

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