-2- 1. Which statement is true about C - C bonds? 3. The compound which shows both cis-trans isomerism and optical isomerism is (A) A double bond is made of a sigma bond and a pi bond. H H (B) There is a higher electron density -, / between the atoms in a single (A) C C H bond than in a double bond. / -, / (C) The distance between the nuclei C C- C- H of the carbon atoms is shorter /1" / -, -, in single bonds than in double H H H Br H bonds. H (D) Single bonds are more reactive towards most reagents than double bonds. CI CI -, / (B) C= C Item 2 refers to the following structure. / -, C C-H HH HH /1" / -, I I I I H H H CI H H-C-C-C-C-H I I I HH H H H H-C-H -, / I (C) C C H-C-H / -, I C C- H H /1" / -, H H H H 2. The IUPAC name for the structure is Br (A) 2 - ethyl butane (B) 3 - ethyl butane H H (C) 2 - methyl pentane -, / (D) 3 - methyl pentane (D) C C / -, C C- H /1" / -, H H H H H .. GO ON TO THE NEXT PAGE
Transcript
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1. Which statement is true about C - C bonds? 3. The compound which shows both cis-transisomerism and optical isomerism is
(A) A double bond is made of a sigmabond and a pi bond. H H
(B) There is a higher electron density -, /between the atoms in a single (A) C C H
bond than in a double bond. / -, /(C) The distance between the nuclei C C- C- H
of the carbon atoms is shorter /1" / -, -,in single bonds than in double H H H Br H
bonds.H
(D) Single bonds are more reactivetowards most reagents thandouble bonds. CI CI-, /
(B) C= C
Item 2 refers to the following structure. / -,C C-H
H H HH /1" / -,I I I I H H H CI
HH-C-C-C-C-HI I IH H H
H HH-C-H -, /I (C) C CH-C-H / -,I C C- HH /1" / -,
H H H H2. The IUPAC name for the structure is Br
(A) 2 - ethyl butane(B) 3 - ethyl butane H H(C) 2 - methyl pentane -, /(D) 3 - methyl pentane (D) C C
9. Which statements are correct concerningCompound A?
I. It will decolourize aqueousbromine.
It will decolourize cold, acidifiedpotassium permanganate.
It will produce a silver mirror withTollen's reagent.
II.
III.
(A)(B)(C)(D)
I and II onlyI and III onlyII and III onlyI, II and III
..
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10. Which of the following compounds doesNOT give a white precipitate when shakenwith cold ethanolic silver nitrate?
(A)
CI
(B)
CI
(C)
(D)
11. Which of the following would release aproton MOST readily?
(A)(B)(C)(D)
CH3CH20HCH3COOHC6HsOHCH30H
12. Hydrogen cyanide is more likely to add toethanal but not to ethene because
(A) ethanal is more susceptible toelectrophilic attack than ethene
(B) ethanal is more susceptible to freeradical attack than ethene
(C) ethanal is more susceptible tonucleophilic attack than ethene
(D) the addition product formed withethene would be unstable
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20. Which of the following statements about 24. Hexane will not absorb light in the UVNISgravimetric analysis is NOT true? region of the spectrum because there is a
(A) Gravimetric analysis is a purely (A) large difference in energy betweenquantitative method. the bonding and antibonding
(B) Gravimetric analysis never orbitalsinvolves the removal of volatile (B) large difference in energy betweencomponents of a solid. the bonding and non-bonding
(C) The analyte can be identified after orbitalsprecipitation and isolation have (C) small difference in energy betweenoccurred. the bonding and non-bonding
(D) The amount of analyte lost due orbitalsto solvation is assumed to be (D) small difference in energy betweennegligible. the bonding and antibonding
orbitals
21. Which of the following analytical tech-niques is considered MOST specific for 25. Whichofthe followingpairswill NOT absorbidentification purposes? infrared radiation?
(A) Mass spectroscopy I. H2and Cl2(B) UVNIS spectroscopy II. NH3andHBr(C) Gas chromatography III. CH4 and Br2(D) Thin-layer chromatography
(A) I only(B) II only
22. Which two features BEST describe ultra- (C) I and III only .violet radiation? (D) II and III only
(A) Long wavelength and high energy(B) Long wavelength and low 26. Which of the following statements about the
frequency partition coefficient may be true?(C) Short wavelength and high
frequency I. It does not vary with temperature.(D) Short wavelength and low energy II. The solute has to be in the same
molecular state in both solventsfor it to be a constant.
23. Which of the following types of electronic III. The two solutions have to betransitions would NOT produce absorption concentrated for it to be ain the UVNIS region of the spectrum? constant.
(A) s~p* (A) I only(B) p~p* (B) II only(C) n~p* (C) I and II onlyCD) n+-s s" (D) I, II and III
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36.
Item 33 refers to the, following fractions ofcrude oil.
I.
II.III.IV.
DieselPetrolRefinery gasKerosene
33. The correct order in terms of INCREASINGboiling points is
(A)(B)(C)(D)
I, II, III, IVIII, I, IV, IIIII, II, IV, IIV, II, I, III
34. Which of the following products is NOTproduced for commercial purposes by theelectrolysis of concentrated brine?
39. Compounds of sulphur such as sulphitesare used as food additives. This is becausethey
(A) improve the flavour of food(B) help to enhance the colour of food(C) inhibit the oxidation of unsaturated
fats(D) help to preserve the food by
dehydration
40. Which of the following industries usesulphuric acid?
I. FertilizerII. Paint
III. FibreIV. Detergent
(A)(B)(C)(D)
I, II and III onlyI, III and IV onlyII, III and IV onlyI, II, III and IV
~.A.:M:PERDOWl"1 HIGH SCH.OO:I • r-, '"' f, R",'{, I b !,< /'\ ,"., ~ " ~,
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r:, (
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41. Which of the following is NOT a green-house gas?
Item 44 refers to the following schematicdiagram.
(A) Ammonia(B) Carbon dioxide(C) Methane(D) Water vapour
Nitrogen Rain and
Items 42-43 refer to the followingdescription: •• Plants
fixation lightning
LitrifyingJbacteria
OrganicN2
compoundsAerosol propellants such as Freon-Ll ,CCI3P, are of major concern because oftheir photochemical reaction with ozone,03' Ultraviolet radiation in the stratosphereproduces chlorine radicals, which thenreact with ozone, producing oxygen.
Bacteria Bacteria
44. W would MOST likely be
42. A balanced equation for the photochemical. decomposition of Freon-Ll is
IF YOU FINISH BEFORE TIME IS CALLED, CHECK YOUR WORK ON THIS TEST.
C.AMl'ERDOWN HIGH SCHOOL
LIBRARY
j
28.
29.
II.~
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27. Which ofthe following is NOT a stationary ·30.phase used in chromatography?
(A)(B)(C)(D)
AluminaCelluloseSilica gelStarch
Item 28 refers to the following information.
A student carries out an experiment usingthin-layer chromatography separation onsilica gel and obtains the following results:
Compound Distance Travelled(em)
Compound A 1.5CompoundB 9.1Solvent 12.5
The Rf value of Compound A is
(A)(B)(C)(D)
0.070.120.160.73
A solution of 109 of a carboxylic acid(weak acid) in 100 ern" of water is shakenwith 100 em' of ethoxyethane. It is foundthat only 6.5 g of the acid remains inaqueous solution at equilibrium. Thepartition coefficient is
32.
(A) 0.054(B) 0.54(C) 5.4(D) 54.0
Which of the following are advantages ofsteam distillation?
I.II.
III.
It occurs under reduced pressure.The components do not decompose.It provides savings in fuel cost.
(A)(B)(C)(D)
I and II onlyI and III onlyII and III onlyI, II and III
Which of the following are important factorsto consider in determining the location of afactory?
31.
I.II.
III.
IV.
(A)(B)(C)(D)
Proximity to a potential workforceAvailability to a means of
transportationPotential pollution of air, land and
waterProximity to raw materials
I, II and III onlyI, II and IV onlyI, III and IV onlyI, II, III and IV
Along with silicon dioxide, which of thefollowing compounds constitutes the mainimpurities of bauxite?
Item 13 refers to the following structure oftyrosine.
C02HI
H2N-,- H
CR2
~ OR13. The pH of tyrosine is MOST likely
(A) 2.1(B) 5.6(C) 7.0(D) 9.0
14. Which of the following is NOT true ofaddition polymerisation?
(A) Only one type of polymer isformed.
(B) The molecular mass of the polymeris a multiple of the monomerunit.
(C) The polymer is readily hydrolysedto the monomer.
(D) The physical and chemicalproperties of the polymer aredifferent from those of themonomer.
15. The product formed by the polymerisation ofpropene, C3H6, may be used as a
(A)(B)(C)(D)
fuelliquiddisinfectantplastic material
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19.
ts. Which of the following may be eliminatedby calibrating a measuring instrument?
(A) Lack of precision(B) Random errors(C) Systematic errors(D) Random and systematic errors
17. Which of the following is NOT a propertyof a primary standard?
(A) Does not undergo hydrolysis.(B) Has low relative molecular mass.(C) Is obtainable in a pure state.(D) Is very soluble in water.
18. Which of the following will NOT affectthe accuracy of the results in a titrimetricanalysis?
(A) Adding excess water to the conicalflask
(B) Blowing the reagent out of thepipette tip
(C) Overshooting the calibration markof the volumetric flask
(D) Purity of reagents
A 300 mg solid sample containing chlorideis dissolved in water. The chloride is thenprecipitated as AgCI by the addition ofsilver nitrate to the solution of the sample.The precipitate is collected, washed, driedand weighed, and found to have a mass of525 mg.
(R.A.M. of Cl = 35.5, Ag = 108)
The mass of chloride present in the sample is
(A) 74.2 mg(B) 118.0 mg(C) 129.9mg(D) 208.0 mg
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Volatility of organic compounds dependson the strength ofthe intermolecular forcespresent. Which compound below would bethe MOST volatile?
4.
(A)(B)(C)(D)
CH3CH2CH20HCH3CH2C~CH3CH3CH(CH3)CH3CH3CH2CH2COOH
In the reaction between ethene andbromine, which statements about thereaction mechanism are true?
5.
II.
III.
(A)(B)(C)(D)
1. A carbocation forms in the ratedetermining step.
A dative covalent bond formsbetween the bromide ion and thecarbocation.
Heterolytic fission ofthe bromine-bromine bond occurs.
I and II onlyI and III onlyII and III onlyI, II and III
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6. Which of the following alcohols will NOT beoxidised by acidified potassium dichromate(VI)?
(A)
(B)
CHzOH
ICH -C-H
3 IOH
(C)
H
ICH -CH -C -OH
3 z ICH3
(D)
CH3
ICH - C- OH
3 ICH3
7. The equation for the formation of the anaes-thetic, CF3CHBrCI, is
