General Instructions to Candidates:

. There is a 'Cool off time' of 15 minutes in addition to the wiriting time of2 ills.

. You are not allowed to write your answers nor to discuss anything with othersduring the 'cool off time'.Use the 'cool off time' to get familiar with questions and to plan your answers.

Read questions carefully before answering.All questions are compulsory and only internal choice is allowed.

When you select a question, all the sub-questions must be answered from the samequestion itself.Calculations, figures and graphs should be shown in the answer sheet itself.

Malayalam version of the questions is also provided.Give equations wherever necessary.

mlmc<](fO6mw

. mlml31ITi15 <T\)!2)CD><mIDlmoJJo6)!2) 15 !2)lmlg 'cfhl<J3 630nD 6)6)50' 226rnoCD>la>l<B6)JO.[QI!>

<T\)!2)CD>rom)~.!UOB.,\6m3<J3<B6)22<mIDa>0n(j)\PJ<IDo~mo, !2)m~OJa>J!2)oCD>l ~CRlCD>OJlml!2)CD>o

m5<mIDO~mO oJo51fiM.

22<mIDa>6m3<J3n{j)\pJ<IDJem<IDlmJ !2)JenJ ~.!UOB.,\6m3<J3lCRIlIDooJlm<}Jo OJOCD>l<B6)6TT)o.

n(j) fiM0 ~ .!U 0 B .,\ 6m3 <J3 <B6) J0 22 <mID a> 0 n(j) \P J<ID 6TT) 0 .

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am ~ <ID ~ .!U 0 B .,\m <TlJa>1 ro3 m 1 em <ID6) em 6) <IDa>6) 6mTID 5 J~ <B6)6TE <ID0 6Tl5 .

cfh 6TT) <B6) cfh l3 BJ Jcfh <J3, .!UII <ID6m3 <J3, l (J) 0 cill Jcfh <J3 , n(j) em 1 OJ 22<mID a> ~ oJ <;H01 ro3 <ID6) em

22 6rn 0 CD>1 a>1 <B6) 6TT) 0 .

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~.!UOB.,\6m3<J3 !2)BJCD>O~<mID1BJJo mr03cfhlCD>13J6TE.

H.S.E.II

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{

Register N o"""" "~ "."."..~.."'..".

Name ................................................

Part -IIICHEMISTRY

Maximum: 60 Scores .Time: 2 Hours

Cool off time: 15 Minutes

~

I (a) What type of defect is shown by the following crystals:(i) NaCI

(ii) ZnS

(om) nill<ID6<IDa)(mID1~6~ <w10.0dbmcfb~oGrO <IDO6>!9nJO<D>601)lcfb1~~6cfboo dho6m1d36>601)a»?

( 1) <:<ruo<w1<D>o<:~O6>6>OM

(2) <ru11fu <ruOO6>6>o.OM (2)

b. WhathappenswhenKCIcrystalsareheatedin an atmosphereof Potassiumvapour.Givereason. .(611n) 6>nJ°30<ru.,\o <:~O6>6>OM lcfb1~~6cfboo 6>nJ°30<ru.,\o OJO<IDcfb<mID1m8.!lJlSOd36>6<:mJOOOomom

<ruojg0J1d36>601)6?om<1ID66>cfbOri? (2)

II. a. Colligative property is used for the measurement of molecular mass of the followingsolute. What change in molecular mass do you observe when,

(i) NaCI dissolves in water.(ii) C6Hs-COOHdissolves in benzene. Give reason?

II. (om) 6>cfbo~l<:(J)g'oJ <:lnJO~<831 <:l2Io~1d36>6~<812I°<ml6>aRm1<86J]J<D><mID1m~nJ<:<D>o(J)l;oo601)6.

<:l2Io~1d36>6~<812I°<m1m omom OJ.,\<ID1<D>oml2loGrO<IDO6>!9nJO<D>601)<ru<B<8jg6m3~lc08 <ruojg0J1d36>601)a».

(1) Nacl gj~<mID1m8~<D>1d36>601)6

(2) C6Hs-COOH 6>611Jem<ru'm1c08~<D>1d36>601)6b. Calculate the molarity of a solution containing 5g ofNaOH in 450ml solution?

(61111) 5g. NaOH ~<D>1~1~6IlSod36>6m> 450ml ~o<D>m1<D>66>s6>l2Io~o01g1 cfb6llS6nJ1s1d36>6cfb.(2)

3. The graph showing the variation of molar conductance with concentration for CH3-COOHand HCI are given below.Analyse the graph and answer the following questions.

3. CH3COOH 6>aR<D>60HCI6>aR<D>6O<:I2IO~o<8cfb6llSdbsem<ru6o <:dho6T13<ruem<:Ls~6o <IDam1c08 611J<T\D1

~1d36>601) l(J)oo.Olc08 m1m>6o <ID06>!9 nJO<D>601) <:.!lJOB.,\6m300cB6) ~<mID00 cfb6>6IlS<mID6cfb.

a.Why the graph obtained in each case has such a large difference?b.Give the equation for the variation of molar conductivity with concentration of strongelectrolyte.

c.Suggest a method to fmd out'?) ma for HCI and CH3-COOH.(om) l(J)Oo.O6cfbOO<IDam1c08OJ~6>0 OJ.,\<ID1<D>omodho6m1d36>601)6om<1ID66>cfbOEiTE? (1)

(61111)6306 ffi)<:lSO6m3@~db<:lSO6>6>rugl6>aR<:cfbo6T13<ruem<:lScil:jmm6nJo<IDcfbI2l0<D>6~<:I2IO~o<8cfbGTE

dbsem<rul6>aROJ.,\<ID1<D>omoOJ.,\<B<IDI2IOd36>601)<ruI2lOJOdh.,\oom!96<ID6dh. (1)

«ru1) HCI6>aR<D>6OCH3COOH 6>aR<D>6011ma dhGTE6nJ1s1d36>om6~ 6306 l2Io<8~om1<8<:~CIO1d36>6cfb.

(2)

(2)

!I\.]

1)ti)

~HC\

C 1--1$ Co 0 H

rc--7

a. Identify the reaction order from the following rate constants. .

(i) 6.5 x 10-3mol VI Sol(ii) 7.0 x 10-4mol-I VI Sol

4. n(j). <IDO6>!P6>dhos6amnlrol.oo6CTnC20g C2dho611B~aR6dh§1r03mlcm roocrulo.JOJcBamnmamnl6>aR63ocB<wcB

dh6rn6o.Jlsl.oo6dh.

(1) 6.5 x 10-3mol L-IS-l

(2) 7.0 x 10-4mol-IL-lS-l . (1)b. Rate of a reaction increases with temperature. Justify your answer using a suitable rela-tion.

(6n.ll) 63ro6 roocrulo.JOJcBamnmamnl6>aR C2OJ(J)<ID@'Dn911Z10rudhls6CTn<IDlmm6crurol~ dhls6CTn6' anom6

C2WOg;j.,\IZIOWcrulZlOJOdh.,\o@o.JC2wo(J)l~ @<ID crulZlcBcmol.oo6dh (1)

c. What is the molecularity and order of the following reaction?

C2Hs-COOCH3+ H2O ---+CH3-COOH+ C2Hs-OH.Justifyyouranswer.(crul) <IDO6>!P6>dhos6amnlrol.oo6CTnroocruloJOJcBamnmamnl6>aRC2lZ1o§l.oo6eJorolglw6o63ocB<W°6odh6rn6

oJlsl.oo6dh. C2Hs-CooCH3+H2O ---+CH3COOH+C2HsOH ano<IDl6>aRlo.JC2<ID.,\dh<IDOJl<R>BlZlo.oo6dh.

(2)

5. a. Colloidal solution of gold is prepared by striking an electric arc between gold electrodeskept in water, what is this method known as? Why is it regarded as a dispersion method?5. (n(j) C2(J)OWcW @eJcfuC2lS()<W6dh§66>S @swlr03 @eJcfulslcfu~cB.e6>nQ3e1o.Jl~o6ll1 C2(J)ow<wl6>aR

6>dhoC2§owl<wr036>cruoeJllili03 @6rnO.oo6CTn<ID. @'D lo.Jldhlw nQ3<IDC2o.JroleJo6TDolw6>c;Hs6CTnan?

@<IDl6>m <wlcruC2o.JcBlili03 6>1ZIC2<ID<wowldhro6<ID6CTn6><IDmJ)66>dhO~? (2)

b. Explain the observation which are likely to be made when a beam of light is allowed topass through a colloidal solution.(6n.ll)6>dhoC2§owl<wr036>cruoeJllilimlr03dhlsllo.JdhO<R>Odhsamnl0J1§oeJ66rnodh6CTnmlro'dMJ6TDoOJl<R>

Bmo.oo6dh. (1)

t;, a. Certain metals can be purified by certain methods. Identify the method of purificationof the following,

NiGeTiCu

6. (n(j) C2eJOoO6ID36>§ <R>61ID'dhrol.ooJCTn<IDlmowl o.JeJ lo.Jldhlwdh§6~' <IDO6>!Po.JOW6CTnC2eJOoO

6ID3W.e6>C2wog;jl~ lo.Jldhlwdh6>§!P6<ID6dh.

Ni

Ge

Ti

Cu

b. Explain the role of cryolite in metallurgy of aluminium.

(6n.ll) anoeJlmlmlwamnl6>aR 6>mgeJcBg;jlwlr03ldhC2WO6>6>eJgOJoOl.oo6CTnoJ6>ffi>aID?

7. a. Account for the following.(i) Nitrogen does not form any pentahalides like phosphorus.(ii) PCl3fumes in moist air(iii) ICI is more reactive than Iodine.

(2)

(1)

If

7. (oID) <IDO6>!9oJO<D>J<TDruw.e65 d»Om6m6>Q)!9J<IDJd».

(1) 6>6>mlS~oB G:o.Oom)o.Oo<rul6>mG:<J:l°6>~ 6>oJoR°oO66>6>~cwJd»uB ~6rnOtOOJ<TD1~.

(2) @'D@<J:lQ)J2lli mT()<TIDm"lcM:I<mID1r08PCl3 oJJd»<D>J<TDJ.

(3) I Cl mT()<D>cw1G:mtOOouB 01<D>Oahs"lru06rO

b. Ramu wrote the strength of the oxoacids of Chlorine in the following order.HOCI < HCIO2< HCIO3< HCIO4.

Is this order of acid strength correct? Justify your answer.

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<TDJ"HOCI < HCIO2 < HCIO3 < HCIO4 @cm (f()m1<D>0G:6m0?~<mIDmoru.,\.e<IDQ)O<f}6)Jd».(2)

8. a. From which Ore KMn°4 is extractedb. Explain the process of extraction ofKMn°4 from the Ore.c. Cu+ and Ag+ are colourless. Do you agree? Justify your answer.

8. (oID) KMnO4 omcmmT()<D>lm1r08m1<TD06TDoIDahm)lSOahS 6>!lJW6>ill)sJ<f}6)J<TDcm (Y2)

(6TlJ1) KMnO46>oR oIDahlSOcM:IoB loJld»l<D> ru1(f()B"Ic£M>1tOOJd» (2)

«ru1) Cu+ mJo Ag+ mJo m1oQ)1~. ml6\ffiuB @<IDJQ)O<D>lG:<D>o~l<f}6)J<TDJG:6rnO?~<mIDmo ru.,\.e<IDQ)O

tOOJd». (1Y2)

9. a. Write the IUPAC names of the following compounds.

(i) [Co(NH3)SCl]CI2(ii) K2 [PdCI4]

9. (oID) <IDO6>!96>d»OSJ<mID13J2lli <ruo<D>J.e<ID6\ffi@J6>S IUPAC moQ)6>Q)!9Jill)Jd».

(i) [Co(NH3\Cl]CI2

(ii) K2 [PdCI4] (2)b. [Ni(CN)4]2- ion with square planar structure is diamagnetic and [Nic14]2- ion withtetrahedral geometry is paramagnetic. Explain the reason.

(6TlJ1)[Ni(CN)4P- CW<D>0Q)0<mg1tOOJo[Nic14P- oJomoQ)o<mg1tOOJo~6TD" d»om6mo ru1(f()B"Id»m1

tOOJd». (2)

1O.a. Complete the following chemical reactions

(i) CH3CH2CH20H + SOCl2 ~

(ii) C6 HS Cl + NaOH (1) 300 atm, 623~(2) acidify

10" (oID) ill)06>!9 6>d» 0 5 J<mID 13J 2lli m0 <ru loJ ru@<mIDm6\ffiuB oj ~@<mID1<D>otOOJd».

(1) CH3CH2CH2OH + SOCl2~(2) C6 Hs Cl + NaoH (1) 300 atm, 623K

(2) acidify )

b. How will you convert aniline to chlorobenzene. Write the name of the reaction.

(6TlJ1) mT()m1~16>m G:~0G:oo6>6TlJoB<ru"lmotOO1 Q)°g6<TD6>ill)6\ffi6>m?~ mo<ruloJru@<mIDm6><mID om<IDJ

G:oJm1~o6mo1<D>6><J:lsJ<TDcm? (2)

11. a. You are provided with two alcohols having the molecular formula C3HgO which areposition isomers to each other. You are also supplied with a mixture of Conc. HCl and anhy-

drous ZnCI2"How will you identify the compounds.

(1)

(1)(1)

(2)

11. (om) C3HgO oman <ID('[2)Ol<IDOOJ(kfujt2JJ~<IDJo6>oJocru1r:illj08 6>omacruDt2J°Jdb§6t2JO<D>a>ri ~uB<oo

arillo§JdbuB m1613l3uBd361~~l<OOJanJ. amOJa<D>o6>so~o (J)OCU9HCl6>aR<D>Jo am6TID6>6>rilllcwm) ZnC12

6>aR<D>Jo63a>Jt2J1a:bm)~oJo dbls1 ~~l<OOJanJ. @2OJ<D>JoJacD>o(J)l~om6l3l36>m at2Jr03oJo6mTma>ri cruo<D>J

c9<ID6I3l3§JoaOJro<ID1a>1~ol<D>oo. (2)

b. If you treat phenol and chlorofonn with alkali an aldehyde is obtained.1) Identify the aldehyde obtained.2) Write the chemical equation.3) Give the name of the reaction

orPhenols are stronger acids than alcohols. Why?

.

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63a>J ~r03cwl6>6>rillcU5 ~~l<OOJanJ.

( 1) ~ ro3cw 16>6>rill cu5 om 6><IDem OJj c9<IDt2J0 <00J db ?

(2) @2<ID1mJ a<D>o~l~ crut2JOJOdbj6>t2JY'J<IDJdb

(3) @2'D ol<D>O~6>aR aoJ6>a>Y'J<IDJdb

amLDOJO

(Y2)

(1)

(Y2)

n..O"IamouBcU5~r03<ooarillouBcru1am<ooouB amcru1cw1a:b ~6ID. omOIDJ6>dbori? (2)

12. a. HCHO and CH3CHOare allowed to react separately with sodium hydroxide. Nameand explain the reactions.

12 (om) HCHO <D>Jo,CH3CHO <D>JOloJa<IDjdbt2Jo<D>lacruocw1<D>o 6>6>rillacwoa:b6>6>crucwJt2Jo<D>l.

loJOJro<IDID1~l<OOJanJ.@2'Da>ocruloJOJro<IDIDm6l3l3§J6>s aoJ 6>a>Y'J<IDJdb. OJ1CR>B"Idba>l<OOJdb.(3)

b. Certain reactions are given in column A. Match them with type of reactions incolumn B.

OR

Wouldyou expect benzaldehyde to be more reactive or less reactive in nucleophilicaddition reactions than propanal. Explain your answer.

(6TlJ1) adbO§o om <D>1r036>dbosJ<IDID13J~ a>ocruloJOJro<IDIDm6l3l36>§adbO§o 6TlJ1<D>1r036>dbosJ<IDID1

3J~ a>ocruloJOJro<IDIDm6l3l3§J6>saoJa>Jt2Jo<D>l6TlJffi.l)1~1~ a.!1.1a>J°oJs1 a.!1.1ro6><IDIDY'J<IDJdb. (2)

A B

C H COCH NH2 -NH2 C6H5CH2CH3 Friedel Craft's reaction6 5 3 KOH,Hat

C H -CH CrO2CI2 C H CHO Clemmenson's reaction653 )65

C6H6+C6H5COCIAIel3 C6H5COC6H5 Etard's reaction----=7

Zn/Hr C6H5CH2C6H5 Wolf Kishner reductionC6H5-Co-C6H5 HCI

(\ffi) l.O OJ C>

m ~l ~ 1 a CD>C>6) 6) <ill e.n cfu (\ffi) (U) 1 dl1 <13 01 CD>C>c£Hl:j m 6dD ~ 1 roB 6) 6JlJ, <13(T\) c>roB <W 16> 6) aD cu'5 6) LnJC>6) nJ m c>eJ 16> m

ce6>C>uO dDlS6<IDroB olCD>C>cfus1OJC>6)6TT)01)c>a6TT)C> dD60~ olCD>C>cfus1OJC>6>6TT)01)c>a6TT)C> ml6m3uO dD<O6<ID6

01)<ID? OJ1uoB1dD<olce6>6dD (2)

13. a. (i) Arrange the amines CH3NHZ'(CH3)zNH and (CH3)3Nin the order of theirbasicity. Explain the reason.

(ii) How will you convert benzene diazonium chloride to phenol.Or .

b. What is Hofmann's bromamide reaction. Explain.

13 (nID) (i) CH3NHz, (CH3)zNH, (CH3)3 N nID01)1 (\ffi)f2)1m6dD6)~ (\ffi)OJCD>66)Sa6JlJ(T\)1(T\)lglCD>66)s

LdDf2)<mm1roBLdDf2)1dD<old16)6dD.dDC><O6TT)oOJ1UOBf2)C>ce6>6dD (2)

(ii) 6)6JlJ<13(T\)1<13(U)CD>a(T\)C>6TT)lCD>oa~C>6)6)o{U)l6)m <ill1amc>uO ~d16)lf2)c>mO1)6)<ID6m36)m? (1)

(\ffi)6) ~ ffi> 1 roB

6JlJ 1. a aD c>cill f2)c><13ffi5 a L6JlJ c>f2)6) 6) f2)cu'5 01 CD>c>c£Hl:j <13 nID 01) c>6) eJ aID? OJ 1 uo B 1 dD <01ce6> 6 dD ( 3 )

14. a. Sucrose can be hydrolysed using acids or enzymes. The product obtained is named asinvert sugar.Why?14.(nID) (T\)6aLdDC>(T\)16)m6)6)aDaL{U)C>eJ1(T\)1ffi5ms<mm1 dD136an ~roB~an<mml6)m "@2<13aOJro§dl16(J)ro"

nIDmJ OJ1~1ce6>c><13dDC><O6TT)6)f2)aID? ( 1Y2)

b. What do you mean by denaturation of proteins?Or

How can you explain the amphoteric behaviour of aminoacids?(6JlJ1) aLnJC>31m6dD~66)s'{U)1am~aodl1<13' nIDanc>roBnIDaID? (1Y2)

15.

(\ffi) l.O OJ C>

(\ffi)f2)lamc> ~(T\)1{U)6dD~66)S (\ffi)oa<illC>6)301cfu (T\)J@C>OJo nID6m36)m OJ1UOBf2)C>d16)C>O.(1Y2)

Buna-s in a substitute for natural rubber.a. Name another synthetic rubber and give its use.

15. (T\)JC>@C>OJ1dDo6JlJo1m nJdD<OO ~nJaCD>C>(J)1d16)C>OJ601)63<06 anJc>~lf2)ro ~6Ti5 6JlJ~l6TT)-S

(nID) dD~L<ID1f2)06JlJOC>CD>1~nJaCD>C>(J)1d16)C>OJ6an aOJ6>oC><O6 anJc>~lf2)ol6)og anJ<O6° ~nJaCD>C>(J)OJ6°

nID\P6<ID6dD. (1)

b. Natural rubber obtained from rubber latex is soft and sticky. Suggest a method toimprove stiffness of rubber. Indicate the chemistry involved in the process.

OrWrite the monomers present in

(i) Nylon-6,6(ii) Bakelite

(6JlJ1) 06JlJro eJc>gcfu(T\)lroBm1an6o ~611SC>dD6an(T\)JC>@C>OJ1dDo6JlJol6>og dDc>olm~o dDl3601)<ID1m6~

63<06<o1<ID1m1roa~uo1d16)6dD. (\ffi)<ID1roB~uO6)~31<olce6>601) <OC>(T\)f2)c>goOJ~c6<IDf2)C>d16)6dD (2)

(\ffi) l.O OJ C>

<IDC>6)\p~OCD>6an anJc>~1f2)°6dD~66)S af2)c>a6TT)C>f2)°6dDuO nID\P6<ID6dD.

(1) 6)6)maeJc>6T1B-6,6,(2) a6JlJd16)6)6)eJg

~

16. a. How do antiseptics differ from disinfectants. Give one example of each.

16 (o{j) ~oRl6>ffi)n.Jgl<B6)6 <6>§6o cwlm)2:QcID6>nOabgoR6 c&§66 <IDQ)2}18..16~QJj <IDj°ffi)o ~BOoO<1>6mffi)

001<ID° QJj <6<ID!2)0<B6)6<6> (1Y:z )b. Why do soaps not work in hard water?

Or

Is paracetamol useful as an antipyretic and analgesic. Comment.

(mJ1) ~ffi)°il <6>olm~8..I<mIDlr08 o{j)§6CJ:1°loJQJ<3<mID1<B6)6<:ml~c&O<1>6m6>!2)<m)?

(ID() LO QJ 0

( 1Y:z)

oJO<1>O6>ffi)g~!2)Ou363<1>6~oRl6>6>oJ6>oglab ~(!))6° (ID()mou36>~ffi)lab ~(!))6° ~oJ~(!))oCf)l<B6)ocID

oJm~!2)O? (ID()@lloJO(!))oQJj<6<ID!2)O<B6)6<6>. (1Y:z)