(krn{ra) · choosc onl. corrcct answer and indicate it on the multiple-choice ans\\'er shcc-t...

$: (KrN{rA) · Choosc ONL. corrcct answer and indicate it on the multiple-choice ans\\'er shcc-t pror,idcd. Rcad the instlrrclions ttn the multiple-choice answer sheet vcl.\ careiuill$
962i1CHEMISl 'RYI'APER I1006I ' l hours

PERSIDNN GAN KEt]ANGSAAN PI ]NGE'I I] A-PENGE I'T iA

SIJKC)LAH N4ENGENGA!I C AWAN(;AN lVIT]I-AKA

PEPERII(SAAN T'I]NC}FSANAN SIJIy'II\(](JI PTRST]-IiOI-AIIAN ]\4ALAYSIA 2O()6

CHEMISTR\ ' (KrN{rA)

PAI'HR 1(KIIRT,\S I)

MIILIIPLL-CIHOI(- ' I ; ( AN I - K.\ Pl i -

on,r hour and lbrt-y-fivc lninutes (satrr .jitrn crnl.rat

r l rAN)

pLr luh l ima mini t )

InslrLrcl ioi ls to canri idates:

DO NoT oPIIN ' I 'HIS BOOI{LET IINTIL YOLI , \RL IOLD TO DO SO.l-fhere are F IFTY <iucstions in this paper. For each qucstion. fbur suggestcd ans\\ urs arc gir en

Choosc ONL. corrcct answer and indicate i t on the mult iple-choice ans\\ 'er shcc-t pror, idcd.

Rcad the inst lrrcl ions ttn the mult iple-choice answer sheet vcl. \ careiui l l .

, , \nsw'er ALL questions. Marks wil l not be deducted for nrons answefs.

[ 'his question paper consists of 12 prinled pages.O Hak Clipta PKPSI,ICN4 2006

TheMind's Q'Bank - A non-profit community initiative by TheMind Association www.themindassociation.org

TheMind's Q'Bank Note - The Intellectual Property of the question set lies with its original copyright owner.Use the document as a complete set and do not ammend any pages.

Fotu' suggesteLl otls\\ers laheied A,on-rhter.

2

Section A

B, C, und D are gtven for eacl.t que-stion. ('hoo,se one L:ortecl

1. Ethanerlioate ions^ C20+2- are oxidized by acirl i f ied. aqueous rrorassiulnmansanate(VII) according to the equation:

2MnOa-(aq) ; -51' : (1. , r { . iq) + 16H*1aq) ) 2} , {nr*(aq.y+ 10CO:(S) , t i l tzO(i)

\ l 'hat t ' tr lultt,: oi t).020 mol dnr-r p,rtassiunr lranganate(VIl) is required to oxiclizecompletc l l 1.() r l { l - ' rnol o1' the salr KHC2O1 I I :U:O1 '?

{ 20 crnr B Jo cnr- ' ( JU ern' D l l5 enr '

/

2. Which quantitv r 'vould best indicate tirc re latire strcnglhs of'rhc hydrogen bondbefu'cen the molccules in l iquid hydrogcn halides?

-\ ht ind dissociat i t r r r cncrSies

i3 enthalpy ciiangcs o1':;olution

C enthalpr change s of'fbrmation

.D cnthaipl ' changcs c'rf vaporization

i. .

Which of rhe follorving eserts the highest pressurc', '

\ | nrol of \ - - at 0"C in I | . l drn '

B I rnol o1'N: at 27"C, in 22.4 drn'r

( ' i molol- lL() atz7oc in I dmj

D i mol of [.a1il11 at its normal boil ing point

+. ln lvhich of thc lbllorving do the tvn,o spccies reprcscrtcd hal.e thc same shape?

A l-l l l : and PH-:

B L.O2 and SiO2

C SO.. and ( 'O1:

D PCl.r- and CHl'

A substarrcc cannot exist as a l iquid under roonr condi t ions i f

,,\ i ts crit ical pt"essure is abovc atmospheric pressure

B its critical pressurc is belorv atmospheric prcssure

C its triple poinl pressurc is above atmospheric pressure

D its triple poinl pressure is below atmospheric pressure

5

STPIV trial 2t)06 Melaka - CHENIISI RY I



6. Oxygen reacts vv'ith platinum(Vl) f luorjde.ptF,; as ibllots:O:rPtFo )02'ptF5'it $'as suggested that xenon shoulcl rcact similarl l,. and in this \\,ay. the l lrst noble qas

c()mpound \\'as prodLlced.

Xe +P1Pu t Xe-PtF6-

what is the most l ikerl ' reason for thc suggestion be ing made,/.{ O and Xe have similar atomic radii

i l O ancl Xe have sirnilar electron affinit ies

C .0 and Xe havc similar clectron coniigr-rrarions

D O and Xe have similar f irst ionization encrgies

il ' Which of'the ftrl l ir" ' , ir lg statements is true f or a standarcl cell set up using the lralf-cellsbclou, l '

Ni}r NiSn: ' , "Sn

Fr- -o..t ivFt- -0. I 4v

A Electri-.ns flou, in thc eltcmal circri it tr irnt \ i to Sn

ll i{eduction occurs a1 the Ni tenninal

( ( 'oncenlrat ion of Snl (aq) rr i l l incr.c lse

l) F..m.f. of rhe cell rvii l i ircrease on increariirs corccrtration of Ni:,

8' The standard enthalpy'changesof'formation of carbon dioxidc and u,ater arc -19-1k'lmol-r and -286 kJmol-lrcspectively. If thc standard cnthalpl,change ot'combr:srion o1'prop):ne. ( i : I la. is -1938 kJmolr . rvhat is the stanclarC cnthalpj .nun!" of forn.rat ion of (_3II1?

9' l 'he reaction betrvecn R and S rvas stLrdied using 3 mol dm 3 solution gl'R anrl -i moldm i solution of-S' From the graph belou'. deterrnine the equil ibrium constant. l i ,. of'rhcrcacl ion :

R (g) + 25 (g) {-' } ' l (g)

[Sl / mol dm-:]4

Timc/min

A r 1258 k. l rnol-r

C t 184 kimol

C

li8 rnol :c i rn6

l /4 mol-r dm6

B - 184 kJmol I

D - 6ti i9 kJmol I

il 1i2 mol'2 clm6

D I mol-2 clmt'

S IP\'l trial 2006 \,lelaka - CHIIMISTRY I



96}lt :1

10. The solubil it,v product of calcium fluoricle in *'ater at 20'c is 3'2 x l0-rr mol: dm ' '

Caiculate the soluLril i t l ,oi.ot.iutt f luoricle in 0'2 rrlol dln-r sodiurn f ' luoride solution'

A l . t l r l ' - i nrol drn i R 2.0 t l0I m,t l dm'

C8.0x10" 'moldm]D3'2x10- ' lmcl lc lm-r

I t. A samplc ol I rnol o['ethanoic acic] is diluted at constant temperatttrc- to a voltrtrc of V'

Which diagram shou's lhe con'cct cl"range of pl1 agairrst V')

pl{-tnHl. >t"-i

tLi-r nH

i

-----------> v

11. At 300K, the ratc constant ftrr a reaction i 'r 8 78 s

l l .9s : . f hc act i i ar ic ' r t c l lcrg) of th i t rcact i ' 'n is

( gas constanl . R - 8.- l l ' lK 'nrol ' " ' \mhentt ts cqt lat lon

stornach ?

A lH l - lHAl> [ \ " ]( u lAl> t l l - l - IAI

A 54.1 kJmol

C -5, t r .1 kJmol I

A 16.09

C 7.25g

B i l r ' l t lA I t ' lHAl

D IH l - IA l> [ l iAl

B

I)

B 8.009

D 6.259

' . .\t I10K, the rate constirnt is , '

k- \er 'Rl ;

74.1 kJmol l

-74.1 k imol '

l4.At95.t- , thevapourpressureol 'nater isS' l .5kPaandthevapourpresst t reotbronobenzcne'Crt l - . tsr is15.5kPa.t ]a lcuiatethenlaSSofwalerrequiredtosteamdist i l l10.0 g of bromobenz.ene r'vhen the atmospheric pressure is 100'0 kPa'

(r .a.m of : C, 12 : l l ' l : Br ' 80 ; O' 16)

|2.stomachjuicehasapHoi l .0 'Aspir in isamc. 'nol . ,asicacidrepresentedb-vFtA(K.-iO o *ot dm-r) ivhich dissociatcs into ions of tl- and A

Whataretherelat tvec'onccntrat ionrof l l "A'andl{Ar ihen lspir in l iomatabletenterst l re

Sl PM trial 2006 \'lcLaka - Cl'lE\'IlS'fRY I



96211 5

15. A l iquid mixture P and Q has the b.p-cornposit ion diagram as shor'vn belou

b.p

o o'2 rnole fractiJn

I U l'

\\rhich o1'the follou'ing is true of the l iquid trrixture above ?

A ' i 'hc solution shous positive deviation {iom Raoult 's lau' '

ts lJpon ruixing cf P and Q. volurne slightlf incrcases'

C When sol ' - r t ion y is f ract ional ly 'd ist i l led. the dist i l latc is pure P.

D Vapour pressure of pure Q is higher than that of ptrre P'

1 6. Wh ich prgpelt\, of the first six elemcnts oi Period 3 (sodi;um to sulphtrr) continuousl}'

increarcs rrumerical l l ?

\ , \ - tomic radius

ii l j irst ionisatirrn energ)

(. \ larimum oxidation number in oride

D lvlelting point

1l . Which of the fbllowing sets of phy'sical propcrlies is that of an element in Group 2 of'

the Pcr iodic lablc ' l

!r,!elf ury poilt i oC Den,ritl' .,' gcnt3 Eler'lrical Conductit:in' ' tthnitm'l

A 98 A.97 2'4 x 107

B l l - i 2.07 5 '0x10-r( '

C 649 1'74 22x 107

I) 1741 I 1.30 6 '0 x 107

lg. l 'hc chlor ide of an element X is a l iquid uhich has a bor l ing point of 76' ' ( l and l i rmes

i* air After mixing 0.010 mol of the chloride u'ith watcr, the re sulting solution require d 100

cm3 of 0.30 rnoidm 3 silver nitrate for complete precipitation of the chloride ion'

In xhich group in the Periodic'fable is element X l ikely to be located?

A Group I

( l 'Group 15

STP\'I rriai 2006 \4elaka - CHEN{ISTRY I

B Group 13

D Group 17



96211

1o. AlCl: rcacts with l, iAlLL and (Cllr):N to give (Cll lr)-lNAII{3. Which of the lollou,ingstatemenls is true about (CH3)rNAlI{3?

A t'he Al aiom is tetrahedrallv coordinated

ts 'fhe Al atom is electron deficient

C It is optically active

D It contains hydrogctt bonding

20. Solder is an allol of t in and lead. A sample of solder is heatcd in an crccss of oxygen

ancl is then allorved to cool at room temperahtre. 'l'he residue rvill contain

A Sn and ['bO

B SnO and PbO:

tl SnCl, anil PbO

D SnOz and PbOl

21. Which of thc fcrl lor.ving does not involve the lonc irair of clccrons on the tri ir.rgcit atotl

ot' the amrnonil l mr-rlecti lel '

A Thc formation ot'NIl.1- ions in aqueous anttttt. ' tt ia

1l ' i 'he dissolving of silver chloride in aqtteous at.t.ttttonia

C the lormation of NI{" ions during the rcaction crl 'atnmonia lvith sodium

D 'lhe hl'drogen bonding that occurs trcfivcen mr:lecttles o1'ammonia

22. Which of the lbllor ing statemcnts explains thc obscrvation that magnesium hydroxide

dissolvc:; in aqueous anmonium chloride, but not in aqueous sodium chloride'l

A ' l ire anrrnonium ion acts as an acicl

ts Arnmoniunr chloride dissociates less full l ' than sodium chloridc

C fhe arnmonium ion changes the solubil it l product of magnesium h1'droxidc

D Ammonium hy,clroxide is first lbmed. and then acts through a corlrrotl ion cffect

23. Which of the follorving con.rpounds reacts nith chlorinc under specif-tc condition to give

trvo products in rvhich chlorine has dil lerent oxidation nntnbers'l

i i Sulphuric acicl

C Potassium iodide

Il Sodium h-vclroxide

D Potassium iodate(V)

B Sodium carbonate

D Sodium ethanoatc

l-4. Which of the follorving compounds wouid give coloured lumes on warming rvith

concelltrated sulphuric acid?

i\ Sodir.rm bromide

C Sodium chlor ide

Sl-Pl\'l trial 2006 N4claka - CHFI\{ISTR\' 1



9b2/ l

2-5. ' l 'he table below shows the possible oxidation states of f ive d-block elements in thePeriodic Tablc. The elenrents are represenlcd by letters which are not their symbols.

Possible oxidation numbers

Which of thc follon,ing ions is likely to exisr'.)

A \\io:"

B XO+r-

C \O4,D

ZO.:O

26. l,etters u'rittcit ()n papcr using arlucoLrs untntonium thiocYanatc are inr.isible unti lturned blood-reci bi brushing thc paper u,ith aqueous iron(ll l) chloridc. If t irc: amm6niumthiocvanale is frrst rnade alkaline, the letters arc br()\\n ancl less clear.Which of the iolioning sttbstances, wlien lbrmed on the paper in these reactions. bcsierplains thcse crbse rvations?

\\ ' i th aqLreous With alkaline aquei-)LlslLnrnroriium thiocl,anate ammoniunr thiocvanate

r. I c- \ l l : conlplex

i j Fe-S[ \ - complex

( ' I rc-SC\ cornplcx

l) l :c-SC\ complex

Fe(OIJ)r

Fe-NH3 compler

fc(Oi{)r

Fe-OI I- cornplcr

?1 . ' l hc .t ltrLrr of ci 'namon oil is due to cinnantaldchycle. ClqHr(). \\.hat is thehvbrii l isatiorr t-,f eacli carbon atom in cinnamalcjch_vde ? Ilou,many o bonds arrtl hon, marrv nbonds does cinnarnaldchvde have?

-CH-ClI-CHO structurcofcinamaldehvdc

hvbridisation

sp2qn

on

7

5

5

5

6

1aIL

12

r8

l8

qn' - t '

){n-

A

t-t

( '

l )

STPN,I trial 200(r lvlclaka - CTHEMIS I Ry l



962t1

25. The rable below shows the possible oxiclation statcs of f ive d-block eiements in the

Perioclic Table. The elements are represented bl letters ivhich are nottheir svrnbols.

\ \ h ich o{ ' thc lb l lowing iotrs is l ikely to exist /

\ \\'or-B XO.rr-

c \01

D 1022"

16. Lettcrs $,rittctl on papr-r using aqLrcoLr\ anMrL)niLIm thiocl'anate are invisiblc unti l

tLrrned bloocl-r 'cd by brushing the papef ri ' i t l t aqueous iron(ll l) chloridc. I{ ' t ire ammoirium

thiocl'anate is f lrst madc alkaline, the lettcrs afc br()\\u and less clear.

\\ 'hich ol-the folloiving substances. when lbrnteci r)n the paper in these rsacti(l l ls, bcst

explains thcse observati ons'.)

\\ ' i lh aqrreous Wilh aikaline sqLte!)Lis

alnnlonitlm thiocl anate atnmonitttrl thiocr attate

A Fc-NI[ : complex Fc(OI I ) :

lJ Fe-SCN complcx Fe-NH3 complex

t Fe -SCN cornple\ Fc(OI l ) r

l) |c-SCN complex Fe-OH- conrpler

?1 . l 'he odour of cinnamon oil is due to cinnamaldchyde, Cstlxo. What is the

hl ,hr ic l isar ionofeachcarbonatomincinnamaldcl t -vde?I lou'man) 'o l rondsandhon' t .nat t r n

bonds does cinnamaldehyde have?

f.)\-."-cFr-cHO\",/

tl

( '

h_rbridisation o

spr 12

structure of cinamaldehYde

I

5

5

5

I2

l8

IB

sp

sp1

qn-

S]'PN'l trial 2006 Nlelaka - C HE\llSl ltY I



C CH:( ' I I (OH)CO:]I C'l l rCHr( ' f lBrCH.

29. which of the fbilou'i 'g order of'nitration. alki,. lation and brominariongive the best.vield tbr the s1,'nthesis of 2-bromo-4-nltromethylbenzcns-. f iom

A alkylation. nitralion, brominatiolr

B alk1.' lation. bromination. nitration(l nitration. alki, lation. bromination

D nitratiorr, brorl ination. alkl, lation

962i1

28. Which of the follorving

A Cll:=CIJ-CHO

(. CH-C.C]IJ,-OI i

r\ c.,

O cHCrcHr

P(.H:CH:C'l

ct{rcHCtl

ci t rcHrcl

ct t2clct ] 12ci

is a chiral compound and is also soluble in lvater,.)

llHo (n\ Rr

\v/

c'.1'

is expcctedbcnzene?

30 .When aclucous potassium hYdroxicle scllution rs added separalely lo compounds lr ancltl and^then rellured: l iquids y ancl l iquid Z arc procluce,l ,espcctively,. t_iquld y does ncrrgive effervescence rvith sodium rnetal. while 0. i rnol of-l iquicl Z prodLrccs2 21 d;i; i

' '

hvdrogen gas under standard.tcmperature and pressure. \\ 'hat are the possible structurallbrmulae for P and Q? ( l rnol of gas occr-rpies a 'o lLrme.f 22.- i dm, at s. t .p.)

a\

Dt-,

C

D

acHrctclr

ctHzc]cl,t:cl

cH2ctrcl{2cl

cltrcucl2

31 A compound Q has thc following composition acoording tc) irassi carbitn 61.3%.nydroged 7'l0lo; ox.vgert28.6'k..Q reduces Fehling-s solution to copperil) oriclc. 0.1 mol ereacts completeil 'r i , i th 4480 crn3 o1-hydrogcn gas (rneasurcd at s.t.p.) in the prcsence ofnickel as catall 'sr. ( 1 mol of gas t-rccupier a r,,Jumi of 22.4 an,, ot'r. i.t iCornpound Q possibly is ?

B CH3T]H:CH-CFI-CH-CIIO

D CI l2:CH-CH-CH_Ct{._Coor I

) ,:, \\1hich of the {bllotving statements is nol true abttur

Cellulose: is a poly'mer of glucose

Glucose can reduce F'ehling's solution and l.ollens

Glucose reacts lvith 2,4-dinitrophenylhydrazine to

Glucosc molecule has a ketone group

glucc,se'l

' rcagent

forrn a yellorv precipitate.

B

C

I)

STPl\'{ trial 2006 lvclaka ^ CI]EN.{lSTRY I



962i I

33. 4-meth1'lpentan-2-one' MIBK' is a solvent trsed in glue

(CHI):CHCII;COCI{: ]\{IBK

\\ lhenthcglueistestccl . lvhichi l f thefol l t l r r , ingresul tcouldbe<Juetothepresenceol .MII]K']

Al tg ivcsareddishbror ' r 'nprecipi tateonboi i ing\ \ ' i thFchl ing'ssolut ion

Blt isoxidisedandgivesagrcel lcolourat iot- tonr,ratmingwithalkal incaqt le()us

Polassiurn dichromate(lV)

C It gives a ycllolv precipitate on i larmiug u'ith alkaline aqueolrs iodine

l) lt gives a srveet-srnell ing l iquid on u'anrtins n'ith benzoic acid

] . i . \Vhichoneoi ' the|ol lo i r ingprocedurcsuorr lc ig ivcthchighest l ie ldofeth- ' ' let l rat toatc.CH3COOC2Il '. startlrt"g t:t"t t ' ft^""ic acirl ' ( ' l i 'COOtt' and elhanol" Cl:H:Oll ' l

A Reacting CI lrC'OOH u ith SOCI:' then adding C:ll5OH'

R Reactins (-:1 l 'OI i u' ith SOCI:' then aciding CII3COOH'

C Re{lr ix inc a t r i r lure of cf l ;cooH anci ( ' l l 'cH:OII \ \ i th NaOH'

I) Retluring C:t1:OH rl ith concentratecl l l :S0 r' rhen aclding Cl l lcO()H'

35. J-he reaction scheme bclorv shor'vs a feu rcacticrns olsalt S

S (*hitc solicl) hcaredwithdilute sulplrurl ' ir ' i 'J r (lumcs qith pungent sniell)

i hcated 'vith

tt ctxcenuatecl H:SO+

Li (gas that bttrns lvith blue flame)

\\ 'hat could S be?

A CH;C]OONAD Na2ClOl

B HCOONa C Na'C:Or

36. A digital t 'atch needs a l iquid.crystal that

(i) is stablc towar<is acidic hydrollsis.

i i i l is stable lorvards alkaline hvdro[1'sis' and

( i i i ) l ta ' uhirul carbon ccl t t ru-

\\ ihich of the fbllorvrng compoullds fulf i ls the above conditions?

rTrA .r.cr r:crrr( H;)o(c)-cooQlq2;t H'

B cu.cH:cH2o @ coo-@@ cx

c crH,[email protected],tH(cH3)2

r) cH,cil,cll(6n,;cH:@@t*t'

STPM trial 1006 N4elaka - C}{F\4ISTRY I



962i1

37. \\ 'hich of lhe following rvould fbrm

A CTHsOH

( ct i l rco2t{

10

an aqueous solut ion with the highest pl l?

B f l2HrNHl

r) ut-r( e) !rH\-,/

38. "Phcnacetin" is used as an ancsthetic. it is prepared from cornpound X and raagcnt Yaccording to the equation bclow:

c:H,-ot9-\rrr - Y c. l t . - ( ) {9rNHCocHl

X Phenacelin

Which of these could be reagcnt Y ?

A ( . l t jco( l l B Col lsClOCl

C (-l[ irCOCH3 D CH3CONII2

i9. GAIIA is a neuro-transmittcr relcascd b1 red aicae u'hich encouragcs shellf ish lr:rr.rc i.

sct t lc tx the ocean bed. ' lhe st fuoturc of GAl l ' \ is l1^\C'11:( . l l :CI I :COOH. In r ihal nar

docs Ci,\8.,\ diff i:r l i ttm amino acids obtained b) ltrdrolrsi-s of protein'?

, \ l i , loe: nol fbnn a zrv i t ter ion

R It is not soluble in rvater

'(l l t is not a 2-aminocarbory l ic acid

l) lt does not form a polydrnide linkage

,10. \Vhich of the follor.ving formulae reprcsents a condensation pollner' l

A CH2-C-C]H-CI-I: ''--ICI i r

-OClf l2CI I2Cl I I :OCOCI l:CFI:Lll I:CO

-c't I:-cH-c'l 12-cH

CII; CN

CHrI

_cIL-C-t -CO0CHzCHI

STP\{ trial 2006 lllelala - CHLNIIS IRY I



96)i1 l l

Section B

For each o/ the questions in fhis section, one or more o.f tlte three tnunbered stalements 1 tr-' 3 ntal' oe

L'orrect. fhe reiponses A to D should bc sclet:tetl as follotts

only 1 iis correct i

only 1 ond 2qre correcl

only2ond3 j 1,2ond3 isre correcl i ore correcl

l

conslallt teniperature fi 'rrm 15 alnl to 60 atm'

\ \ h ie h t ,1 ' thc lb l lorr ing s latcmort . is are

41. Gaseous particlc X has proton number n and a charge of t l '

Claseous particie Y has protoir nurnber n+1 .nd is isclelectronic *it i l \

which of the lbllori ing statcn.ients correctl;-. dcscribes X and Y l

1 X has a larger radir-is tlian Y ,

1 X rcquires morc enet'g)'than Y lvhen a furthei electron is removed frotn eacli particle

3 X rcleases lnorc energy than Y lvhen att clcctrtrn is added t0 each particle

42. \\Ihett a sarnple ol'a gas is comprcssed al

its r,olutuc cltange s l iom 76.0 cm' to 20 'r crn' '

possible cxpianation(s) of this behaviour?

I ' l 'hc gas behaves non-ideall.v

2 The gas dimerisc's

3 l-he gas is adsorbed on the vessel r'valls

+3. The rate cquation for the reaction : A - 28 is given as

I{ate'- k[A]

which of the follorvings islare lruc for the reaction shown above 'J

I when concentration of A is increased. reaction rate increases'

2 Ata constanl tempcrature, half life of this reaction is a constant '.

3 When tcmperature increases' half l i fe of the rcaction dccreases'

41. Forthe lb l lon, ing rcact ion. 2A(g) + B(s) -r

c(g; . 3 l )1g) AH' -ve

Which of thc lbllou,ing rvil l cause theiquil ibrium position to slri l i to the right ?

I decrcasing volume of the sYstcm

2 decreasing tcmperature of the system

3 adding inert gas to thc system at constant pressurc

StP\'l trial 2006 N'lelaka - C.HE\llSTRY i



45. Anhydrous barium nitrate ancl anhydrous nragnesium nitrate both decomposc onheating, evolving nitrogen dioxide and tt.xygen and fonning an oxide.Which of the fbllorving staten.rents concerning these decompositions is/are correct?

I Nitrogen dioxide is evolved at a lorve r telnperature frorn magnesium nitrate thanfrom barium nitratc.

2 For both nitratcs ihc volume of nitrogen diox-ide evolvcd is fbur l imes greater thanthe rolurnc of tlr"""gen.

3 ' l 'he numcrical valus o1-ths lattice energ.v of magnesiunt nitrate is grcaterthan thatof barium nitrate.

46. The Group l4 elernenl germanium is u'idely used in the manufircture ofsemioonductols and other electronic corlponents. ' l 'he existence of this element in Group l4betrveen sil iqon and tin rvas predicted b1 i\ landeleev sorne vcars lrcft,re it r ias discovered.I 'rorn its positi(rn in the group, nhat prot:eli ies of germ;rnitt in tnli. lrc prcdictccl?

I Its most stablc oxidc has the tbrniti l l i ( iei-):.

2 Thc . ' r idc ( ie0: { i , t rn. i , , t l 1 aU . '

3 l 'he bondirrg in GeL-l+ is covaleni

47 Which of thc lolioll ing are pollutanls if lcl,:,rscri into thc atmospl.rere?

1 Nitrogen dioxidc

2 Sulrrhur dioxide

3 Aerosol particles containing lead(li) oxide

48. 10.009 of an acic l R was dissolvcd in 1 dm-r of l iater, 25.00 cm' t '1 ' the rcsul t ing solut ion

required 23.10 crn 'of h.v-droxic lc ion solut ion of 1.50 g per, l rn ' tor compictc neLrtral isat ior . r .Which of the frri lorvirrg could bc the molecular fomrula of R ':

i Cl l ;CI l r ( O() l l 2 (CI{:)4(COO}r): j cHr(( tJ:)6c(x)ll

49. Cornpound Z reacts rvith hot alkaline aqueous iodine soluticrn ttr producc iodolbrn ancla sodium salt, sodiuni 2-rncthylpropanoatc. (Clli):C tl('OO\a . \\Jhat coLrid Z be'l

I (Cl ' l r ) : -CH-CO-CIHr

2 (Ctl:):-ClH-CH(oH)-CrH:

3 C13-CO-CH-(CH:):

50. Whcn 1.2-dichloroethane is ref'lured rvith aqueous sodium h,vdroxide scilution.compound X is fonncd. Cornpountl X rcacts rvith cornpound Y to producc a polymer. Ycould be

1 Hoocr.ocoo}j

STPM triil 2006 N'telaka - ('FlEiltlSTRY I

2 C.lOC:(Clh)aCtOCl : Ho.@oH



(krn{ra) · choosc onl. corrcct answer and indicate it on the multiple-choice ans\\'er shcc-t...

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