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sIJtLTINGGIPERSEKoLAHANMALAYSIA
Instructions to candidates:
DoNoTOPENTHISQI,ESTIoNPAPERUNTILYOUAREToLDToDoSo.
afrrwersare given'
Thereme fifty questionsin thispaper. For eachquestion,four suggested
and indicate it on the multiple-choiceanswersheetprovided.
Chooseonecorrect i^rt,
Readall instructionson the multiple-choiceanswersheetvery carefully,
Answer tll questions.Marfts will not be deductedforwrong an$4)ers'
This questionpaper consistsof 33 printed pages'
STPM9621r
is over.
*Thisquestionpaperis GONFIDENTIAL until theexamination
CO}TFIDENTIAL*
2
CONFIDENTIAL-
SectionA
Four suggesfed
ansurerslabelledA, B, C and D arc givenfor each question.Chooseone
corrcctanswer.
1. Whichof the followingsketchesshowpartof the massspectrumof the refrigerant,
1'c, ttF,tuc,ttcll
CF2C!I?
flhe isotopesare :
A
abundance
abundance
B
D
abundance
abundance
120
122
r24
ry'e ratio
2. Theunitcellof a metalM is shownbelow.Giventhe volumeof the unitcellis Vr cm3and
thevolumeof 1 molof M atomsis V2cm3.Whatis the valueof theAvogadroconstant?
A.
Y zlV t
B.
( VzlVr ) x4
c.
Nz lYi x7
c.
M/Vr ) x14
CONFIDENTIALSb, is in Group15 of the PeriodicTable.The ion belowhasa square-based
Antimony,
3.
pyramidalshape.
F
I
,r,pry'
Deducethe totalnumberof electronsaroundthe antimonyatomandthe valueof n?
valueof n
Total numberof electrons
A
10
1
B
10
2
c
12
1
D
12
2
4. GaseousparticleX hasa protonnumbern anda chargeof +1.GaseousparticleY hasa
protonnumberof (n+1)and is isoelectronic
withX. WhichstatementcorrectlydescribesX and
Y?
C
X hasa largerradiusthanY
X requiresmoreenergythanY whenthe secondelectronis removedf
fromeachparticle
X releasesmoreenergythanY whenan electronis addedto eachparticle
D
X andY belongto thesamegroupInthe PeriodicTable
A
B
H
^o
or|
L \o
HLe -ao$Ln
I
valuesof the bondanglesin
Whichof the followingSrr""tly describesthe approximate
the moleculeabove?
6
v
o
A
900
1900
900
B
1050
1800
900
c
1200
1050
10go
D
1200
10go
10go
{
CONFIDENTIAL*
6.
is the permanent
In whichpairof molecules
dipolein molecule/ greaterthanthatin
molecule
ll?
It/,
Acrcl
t'
\,/
C =C
/\
CHS
B
CHS
CH3CHzCI
f
cl
,rc\
C
CHs
cH3cHcl2
CI
d"'
c
D
CI
6.
CI
CI
I'
I
cl
7. The rateequationfor the decompositionof hydrogenbromide
2 H B (g ))H z(9 )+B r z( 9)
is: Rate= k[HBr]2
Whichof thefollowingconclusions
canbe drawnfromthis information?
A Thevalueof k dependson the concentration
of HBr.
B The rateof appearance
of Brzis halfthe rateof disappearance
of HBr.
C Doublingthe concentration
of HBrwilldoublethe rateof reaction.
D The presenceof a suitablecatalystwill increasethe valueof k.
CONFIDENTIAL*
\'lirrhmeg{*nrruen
fnnnod
the decomposition
8. In thediagramabove,curveXwas obtainedby observing
of 100cm3of
(lV)oxide.
catalysed
by manganese
1.0moldm-3hydrogenperoxide,
Whichalteration
to theoriginalexperimental
condition
wouldproducecurve)?
A
Addingwater
B
peroxide
Addingsome0.1 moldm-3hydrogen
C
Usinglessmanganese(lV)
oxide
D
Loweringthe temperature
9. Thegraphbelowshowsthe variationof pHvaluewithvolumeof baseaddedin an acidbasetitration.
l4
l3
t2
ll
l0
9
8
pH7
6
5
4
3
2
I
0
Volumeof baseadded/crn3
is not true aboutthetitrationabove?
Whichof thefollowingstatements
A Theacidandbaseusedin the titrationmayprobablybe ethanoicacid
respectively.
andsodiumhydroxide
B ThepK"of the acidusedis equalto 4.7.
hydrolysis
to produceOHC Thesaltformedin the titrationundergoes
ions.
for the abovetitrationis methylorange.
D A suitableindicator
10
CONFIDENTIAL"
10.
The pH of a 1.0 mol dm-3solutionof a weak monobasicacid is 5. What is the
dissociationconstant of the weak acid?
B
1.0x 10a moldm'3
1.0x 10 8 mol dm-3
C
1.0x 10 to mot dm-3
D
1.0x 10la moldm-3
A
11. Hydrogensulphidereactswith water accordingto the followingequation.
H2s(aq) + 2Hzo(aq)
+'
2Hao*(aq) + S'- (aq)
Whichof the followingaqueoussolutionswhenaddedwouldcausethe systemat
to shiftto the left?
equilibrium
A Ammoniumchloride
B Sodiumcarbonate
C Sodiumethanoate
D Ammonia
at 600oC,at 1
PCl5(g)is in equilibrium
Whenthe systemChG) + PCls(g) +'
atmpressure,the valueof the equilibriumconstant,Kois 30.
12.
\Nhatis the valueof t$ at a pressureof 2 atmat the sametemperature?
A 2 0 8 3 0 C .6 0 D 1 0 0
A solute,S exists in the same molecularstate when dissolvedin ether and water.
of soluteS in ethersolutionis 6
Whenthe two solutionsare in equilibrium,the concentration
A solutioncontaining14.0g of S in 240cmsof
timeshigherthanthat of the aqueoussolution.
13.
wateris extractedwith40 cm3of ether.Calculatethe totalmassof S extractedfromwater.
2 .0 9
A
B
6 .0 g
C
7 .0 9
D
8 .0 g
t2
CONFIDENTIAL-
diagramsrepresentsa mixtureof
Whichof the followingboilingpoint- composition
waterand hydrogenchloride.
14.
.A
Boilingpoint
0%Hp
r00%Hp
B
0EoHrO
D
Boilingpoint
\Arhichof the followingstatementsis not truefor a standardcell whichconsistsof the
two half-cellsgivenbelow?
Ee=+1.52V
MnOr- + 8H* + 5e- ) Mnz*+ 4H2O
Ee=+0.77V
Fe3*+d ) Fe2*
{S.
A
Thee.m.f. of the cellis 2.29V
B
oxidation.
The MnOr /Mn2*cellundergoes
Electronsflowfromthe electrodein the MnOr'/Mn2*cellto the electrodein the
c
cell.
Fe3*/Fe2*
D
cellwillincrease.
ionsin the Fe3*/Fe'*
of Fe3*(aq)
Concentration
CONFIDENTIAL*
l4
it is possibleto usea verysmallmagnesium
of cardiacpacemakers,
tnthe construction
are
whichcreatesan electricalcellwiththe inhaledoxygen.The relevanthalf-cells
electrode
16.
as follows.
Mg'** 2e ) Mg
E0 = '2.38V
1/zO2+2H*+ 2e ) HzO
E0 = +1.23Y
the celle.m.fwouldbe 3.61V, but in the bodya potentialof 3.25V
Understandardconditions,
of thislowere'm.f?
is moreusual.Whatis the bestexplanation
A
B
C
D
electrode
Thesmallsizeof the magnesium
the magnesiumelectrode
of Mg2*ionssurrounding
The low concentration
the electrodes.
of the bodyfluidssunounding
Thehighresistance
the electrodes.
ThepH between7 andI of the bodyfluidsunounding
aregivenby the followingequations.
17. Theenthalpychangefor two reactions
2Fe(s)+ 3l"Oz(gl) FezOa(s)
;
) CO(g);
C(s)+ %C,z/6,l
aH = - 822 kJ mol-l
AH= -110kJ mol-1
Whatis the enthalpychangefor thefollowingreaction?
) 2Fe(s)+ 3CO(g)
3C(s)+ Fe2O3(s)
A
B
C
D
iB.
+712kJmo1'1
+492kJmo1-l
- 492 kJ mot-1
- 712kJ mol-1
ionic
Whichvaluewouldbe requiredto estimatethe latticeenergyfor the hypothetical
MgH?
compound,
A The electronaffinitYof hYdrogen
C
energyof hydrogen
Thefirstionisation
bondenergy
Themagnesium-hydrogen
D
of MgHz
Thestandardenthalpychangeof formation
B
CONFIDENTIAL*
t6
and9.0g of
required16.0g of oxygenfor completecomb*ustion
4.0g of a hydrocarbon
waterwas producedin the reaction.Whatwasthe massof carbondioxideproduced?
atomicmassof 0=16, C=12,H=11
[Refative
B
9.0g
4 .0 9
A
D
22.0g
1 1 .0g
C
19.
20.
Thevaluesof pK6of severalsubstancearegivenbelow.
Substance
PKu
NHg
4.75
CHsNHz
3.36
cH3cH2NH2
3.27
CsHsNHz
9.38
Whichof the followingis the strongestacid?
B
NHO*
A
D
CH3CH2NH3*
C
CHSNHS*
CeHsNHs"
Gonsiderthe sequenceof oxidesgivenbelow.Whichseriesshowsan increasingorder
of meltingpoint?
21.
A
B
C
D
AlzO.,SOs,SiOz
ClzOz,
SiOz
AlzOg,
SOs,ClzOz,
SiO2,AlrO.
SOg,ClzOz,
SOs
ClzOz,
SiOz,AlzOg,
a metalin a suitable
consistsof partiallydissolving
Theprocessof chemicaletching
solvent.By carefulmaskingof the metal,it is possibleto producea patternin or on the metal.
couldbe usedto etcha patternin aluminium?
Whichof thefollowingaqueoussolutions
22.
A
Ethanoicacid
B
Dilutenitricacid
C
Sodiumhydroxide
nitricacid
Concentrated
D
CONFIDENTIAL*
l8
\Mrichof the followingstatementsregardinglead(lV)oxideis nottrue?
24.
A
lt is amphoteric
B
C
lt easilydecomposeswhenheated
lt hasionicbondingwithcovalentcharacteristics.
D
lt is formedby heatingstronglylead(ll)oxidein oxygen
\ /hich reactionof ammoniadoes not involvethe non-bondingpair of electronson the
nitrogenatom?
A
NHs(g)+ GHsl(g)+
CHsNHg.l-(s)
B
NHs(g) + HCI(g) --+
NHrCI(s)
c
2NH3(l) + 2Na(s) +
D
2NHg(aq)+ Ag.(aq) +
2NaNH2(s)+ H2(g)
[Ag(NHa)z].(aq)
P-ionis
P, Q, andR arethreeelementsin Group17.Q is a solidat roomtemperature.
the weakestreducingagentamongP-, Q- and R25.
of the elementsin increasingintensityof colour?
Whatis the arrangement
A
P ,R ,Q
B
R ,Q,P
C
P ,Q,R
D
Q,R ,P
Whichof the followingcomplexesdoesnot exhibitopticalisomerism?
A
[Cr(GzOr)z(HzO)zf
B
[Cr(CzOr)slL
C
lCo(en)zClz]
D
[Co(NHs)s(NOz)sl
speciesformedin the mechanismof the reactionbetweenmethane
The intermediate
andchlorinein the presenceof lightis
D .CH2C|
C CHCI3
B Cr
A CHs*
27.
20
CONFIDENTIAL-
wereburntcompletelyin oxygen,240 cm3of carbon
When60 cm3of a hydrocarbon
Whatis the molecularformulaof-the
dioxideand0.0125molof waterwereproduced.
The molar
at roomconditions.
(Ihe volumesof all gasesweremeasured
hydrocarbon?
ZB.
is 24.0dm3)
volumeof anygasat roomconditions
B
CSH,
A CzH.
29.
D
CgHs
C
CoHro
Whichtypeof isomerismis shownby eachof the followingorganiccompounds?
A
B
c
D
30.
hasthe highestpKuvalue?
Whichoneof thefollowingcompounds
A
@*t,
B @-*r,ruH,
c
cH3-N-cH3
D ozN-@-ruHz
I
CHs
3i.
Lacticacidcan be formedfromethanolas shownin the rea-cti; schemebelow.
sbDI
cqcqoH:
*cpII
c4cHo5*
stcPltr
Q-.*L
Namethe typesof reactionthat occurin step
-
I
f"
- c =o
J*.
I andstep lll.
Step I
Steplll
A
Oxidation
Hydrolysis
B
Reduction
Esterification
c
Condensation
Oxidation
D
Dehydration
Condensation
22
CONFIDENTIAL*
32.
is formedwhenethanoylchlorideis reactedwith
Whichof thefollowingcompound
HN<O-cHzoH
OH
A
HN{O-cHzococH,
B
HrNI{d-cHzoH
t1'
ao"
ococH3
c
HN<O-cHzococHr
1o.o.",
D
cHrcoHN{O>cH2ococFr2
-1
OCOCH.
33.
is shownbelow.
Thestructureof cyclohexanone
an*
.-.
is true aboutcyclohexanone?
Whichstatement
A
lt is an aromaticketone.
B
lts molecular
formulais CeHrzO.
C
lt canbe oxidisedto benzoicacid.
with2,4-dinitrophenylhydrazine.
lt will givea precipitate
D
Naturalrubberis a polymermadeup of isopreneunitswiththe structuralformula
= CHz. Whichof thefollowingis not trueaboutthis statement?
CH2= C(CH3)CH
A The IUPACnamefor isopreneis 2-methylbuta-1,3-diene
34.
B
C
D
molecules
Naturalrubberis madefromunsaturated
Naturalrubberbecomeshardwhenvulcanized
andtranspolymers
Naturalrubberis a mixtureof cis polymers
24
CONFIDENNAT
X reactswithsodiumto give off hydrogen
35. X, Y andZ arethreedifferentcompounds.
gas.X andY reactto forman ester.X andZ alsoreactto formthe sameesterbutat a much
Y is probably
slowerrate.Compound
propan-1-ol
A
B
propana
C
propanoic
acid
propanoyl
chloride
D
36.
the compoundbelow?
is incorrectregarding
\Mich of the followingslatements
cH3(oH)cHcH2cocH3
A
B
C
D
manganate(Vll).
acidifiedpotassium
lt will decolourise
lt canreactwithalkalineiodineto givea yellowprecipitate.
active.
lt is opticallY
withFehling'ssolution.
lt will producea brick-redprecipitate
are
andCH2BTCH2OH
97. WhenX (a gas)reactswith Y, a mixtureof CHzBTCH2BT
produced.
X and Y are ProbablY
x
A
Ethene
Brominewater
B
Ethene
Sodiumbromidesolution
C
HB(g)
Ethene
D
Br2vapour
Ethene
hydrogen,
by mass.Carbon,64.30/o;
A compoundQ hasthe followingcomposition
solutionto copper(l)oxide.0.1 mol Q reactswith
oxygen,28.6To.
Q reducesFehling's
7.1o/ai
38.
gasat s.t.p.withnickelas catalyst.Q is
4480cm3hydrogen
dm3at s.t.p.l
mass:H, 1; C, 12iO,16. 1 molgasoccupies22.4
atornic
[Relative
= CHCH= CHCHO
C CH3CH
A CH2= CHCHC
= CHCH= CHOH
D CH3COCH
B CH = CCHzOH
CONFIDENTIAL*
is boiledwith aqueoussodiumhydroxideand the reaction
An organiccompound,1,4/,
mixtureis allowedto cool..Upon cooling,compoundX and compoundY (an alcohol)are
produced.
X is converted
to compoundZ (CaH6O2).
compound
CompoundY
On acidification,
39.
givesa positivetriiodomethane(iodoform)test. Compoundt4l is likelyto have the structural
formula
40.
A
CftCH2COOCH3
B
CH3COOCHs
c
cHscH2coocH2cH3
D
CH3CH(OH)CH2COCI
'
Whichof the followingpairsof reactantsWillnot producethe compoundwiththe
formulashownbelow.
structurat
CHa
I
:-C-CHzCHs
I
OH
A
c
D
cH3cH2MgBr and
€)-cocn.
CHs
and
I
CH3CH2-C=O
@-nase'
@aocHzcHs
and
6\-cnrcHsMgBr and
cH3MgBr
cH3cHo
28
CONFIDENNAL-
SectionB
For each questionin this section,one or moreof the threenumbercdstatemenfs1 to 3 may be
conect.The rcsponsesA to D shouldbe selectedas follows:
A
B
c
D
{ only
I and2 only
2 and3 only
1,2and3
is conect
are correc't
are correct
are correct-
diagramfor a hydrogenatomshowsseveralelectronictransitionswith
41 The energy-level
f1,f2,fs,fq andfs.
frequencies
n=qo
n--4
n=3
n=2
n=l
Whichof the followingstatementsis/aretrueof the abovediagram?
faandfsr€pl€sentlinesin the Balmerseries.
1.
2.
3.
42.
Whichof the followingmixtureswouldproducea solutionof pH greaterthan7.
and25 cm3of 1.0moldm4CH.COOH(aq).
25 cm3of 1.0moldm-3NaOH(aq)
1.
2.
3.
43.
The linesrepresentedby f1,f2andfgare non-visible.
fsG?nbe usedto calculatethe ionisationenergyof hydrogen.
and25 cm3of 1.0moldm€ NH.(aq).
25 cm3of 1.0motdm-3NHrCI(aq)
25 cm3of 1.0moldm{ NaOHand25 cm3of 1.0moldm4CH.COONa.
?
by usinga massspectrometer
Whichof the followingcan be determined
2.
massof an organiccompound
The relativemolecular
Theaccuratemassof a nuclide(isotope)
3.
element
The protonnumberof an unidentified
1.
30
CONFIDENTIAL"
A
B
c
D
I only
is correct
1 and2 only
are correct
2and 3 only
are correct
1,2and3
are correct
by the celldiagrambelow.
A cellis represented
Fe2*(aq)
c(s) ll Cf.(aq) ll Fe3*1aq1,
lp(t)
\Arhich
of thefollowingwill increasethe e.m.fof the cell?
2
of Cf*
Increasethe concentration
of Fe2*
Decreasethe concentration
3
of Fe3*
tncreasethe concentration
1
45.
idare
TheelementXhasa protonnumberof 25.Whichof the followingstatements
true of X?
1
46.
47.
2
ThemetalXhasa highdensitY
X formscolouredcomplexions
3
The highestoxidationnumberof X in its ionis +7
Whichof the followingelement(s)has/havethe abovearangementof atomsin its
1.
diamond
2.
silicon
3.
boron
Whichof the foltowingreagentsreact(s)withbothbenzeneand methylbenzene?
aluminiumchloride
of anhydrous
Chlorinegasin the presence
1
2
3
acidon reflux
sulphuric
Concentrated
on reflux
manganate(Vll)
Acidifiedpotassium
32
CONFIDENTIALA
B
c
D
1 only
is conect
1 and2 only
are correct
2and 3 only
are correct
1,2and3
48.
are correct
cn =cu-@-cHgBr
Whattype(s)of reactionwouldthe abovecompoundundergo?
Nucleophilicsubstitution
1.
addition
Electrophilic
2.
3.
Freeradicalsubstitution
A compoundP decolourisebrominewateranddoesnotform a whiteprecipitatewith
P is
silvernitratesolution.Compound
ethanolic
49.
1 ./
92_CH=CHz
cl
3.
CHr=gggtr"'
Al
"o-(u
/\-r, cooH
I
OH
S0.
\Mich of the followingstatementsis/aretrue regardingthe compoundabove?
1.
2.
3.
homopolymer.
lt canformcondensation
light.
lt canrotatethe planeof plane-polarised
wouldreactwithsodiumto produce2 moles
1 molof the compound
of hydrogengas.