Pei Hwa Chem Prelim P1 2012 Qn

7/27/2019 Pei Hwa Chem Prelim P1 2012 Qn

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Class Index Number Name

PEI HWA SECONDARY SCHOOLPRELIMINARY EXAMINATION 2012

Secondary Four Express

CHEMISTRY 5072/01Paper 1 Multiple Choice 23 August 2012

1 hour

Additional Materials : Optical Answer Sheet (OTAS)

READ THESE INSTRUCTIONS FIRSTDo not open this booklet until you are told to do so.

This booklet consists of only questions for MCQs.

1. Write your name, class and index number in the spaces above and on the OTAS.Shade your index number in the boxes provided.

2. There are 40 questions in this paper. AnswerALL questions. For each question, there arefour possible answers A, B, C and D.Choose the one you consider correct and record your choice in soft pencil on the separateOTAS provided.

3. Each correct answer will score one mark. A mark will not be deducted for a wrong answer.Any rough working should be done on this booklet

Hand in the OTAS separately from the question booklet.

This question paper consists of16 printed pages, inclusive of this cover page.


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1 The conical flask contains compound X which is present in solid, liquid and gaseousstates.

Which statement is correct?

A Energy is released when X changes from liquid to solid.B Liquid X is at a higher temperature than solid X.

C A gaseous X molecule has a lower mass than a liquid X molecule.D Liquid X molecules vibrate about fixed positions.

2 A sample of hydrogen is a mixture of the two isotopes H11 and H2

1 . The relative atomic

mass of oxygen is 16.

What are possible values of the relative molecular mass of different molecules of waterformed by the combination of oxygen and hydrogen?

I 18

II 19III 20

A I onlyB I and II onlyC I and III onlyD I, II and III

3 An ion X+ has 23 nucleons and 10 electrons.

What does the nucleus of the ion X+ contain?

protons neutrons

ABCD

1210119

11131214

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6 Solder is an alloy of tin (melting point 232 C) and lead (melting point 327 C). The

melting point of solder is expected to be ___________________________________.

A lower than 232 C

B higher than 327CC almost 232 C

D between 232 C and 327 C

4 Air is a mixture. Which of the following statements support this classification of air?

1 Some gases in air can be obtained from it by fractional distillation.

2 Air is a colourless substance even though it is made up of different

substances.

3 Air has properties that are different from that of its constituents.

4 Water vapour and carbon dioxide in air can be obtained from air by

cooling and compression.

A 3 only

B 1 and 2 only

C 1,2 and 3 only

D 3 and 4

5 Methylamine, CH3NH2 (Mr = 31), and hydrogen chloride, HCl (Mr = 36.5) are bothgases which are soluble in water.

The gases react together to form a white solid, methylammonium chloride.

In an experiment to demonstrate rates of diffusion the following apparatus is set up.Where will the white solid form?

3

cotton wool soaked inconcentrated methylaminesolution

cotton wool soaked inconcentratedhydrochloric acid

A B C D


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7

8

The following tubes contain a dilute solution of a solid X dissolved in a liquidY. Whichapparatus is most suitable for finding the boiling point ofY?

A B C D

A reasonably pure, dry sample of carbon dioxide is to be prepared using calciumcarbonate and dilute hydrochloric acid. The pieces of apparatus available are shown in

the diagrams below but the connections have not been made. What connections areneeded in order to complete the preparation?

A P to Q and R to S

B P to Q and R to T

C P to R and Q to TD P to S only

9 During a chromatography experiment, the ink did not move up the paper. Which of thefollowing best explains this phenomenon?

A A wrong solvent was used.B The ink was not a mixture.C Too little solvent was used.

D Too much ink was used.

Which method is most suitable for obtaining a pure, dry sample of sodium chloridefrom a mixture of solid sodium chloride and solid ammonium chloride?

A Heat the substance gently and collect the substance left.B Heat the substance gently and collect the substance which melts.C Shake the mixture with water, concentrate and leave to cool.D Shake the mixture with water, filter and evaporate the filtrate.

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11 For the mixture in the round-bottom flask, which graph best shows the change inconcentration of the liquid with the lowest boiling point as distillation proceeds?

12 The diagram below shows a reaction scheme involving solution Q.

Solution Q could contain ______________.

A aluminium carbonateB calcium chlorideC lead(II) nitrateD zinc sulfate

5

Solution Q whiteprecipitate

insoluble

Noeffervescence

a few drops

of NaOH

excess of

NaOH

diluteHNO

3


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13 The diagram shows an experiment with aqueous ammonium chloride.

A gas,Y, is produced and the litmus paper changes colour.

What are solution X and gasY?

solution X gasY

A

B

C

D

aqueous sodium hydroxide

aqueous sodium hydroxide

dilute sulfuric acid

dilute sulfuric acid

ammonia

chlorine

ammonia

chlorine

14 What is the total number of shared electrons in the ethene molecules?

A 6B 8C 12D 16

15 Which of the following substances is an element and forms crystals containing small

molecules?

A copperB iceC iodineD sugar

6

solution X

poured in moist litmus paper

heat

mixtureaqueousammonium

chloride


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16 Which substance has the highest melting point?

A diamondB lead(II) bromideC methaneD water

17 An aqueous solution of a salt was placed in a test-tube and aqueous ammonia wasgradually added from a burette. The height of the precipitate formed was measured forvarious volumes of aqueous ammonia added and a graph was plotted as shown below.

Which of the following salt solutions would give the result shown in the graph?

A zinc sulfateB ammonium sulfate

C sodium sulfate

D aluminium sulfate

18 An excess of dilute sulfuric acid reacts with both aqueous barium hydroxide andaqueous barium chloride.

In what way are the two reactions the same?

A A gas is produced.

B An insoluble salt is produced.

C The final pH is 7.

D Water is produced.

7

0

height ofprecipitate /cm

volume of aqueousammonia added /cm3


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19 The table below shows the pH ranges of three indicators - methyl orange, methylred and bromothymol blue.

pH

Indicator

2 3 4 5 6 7 8

methyl orange red yellow

methyl red red yellow

bromothymol

blueyellow blue

What colour would be observed if a few drops of all three indicators are added to asample of aqueous sodium chloride?

A blue B green C yellow D orange

20 At room temperature and pressure, one mole of carbon dioxide and one mole ofammonia have the same

I massII volumeIII number of moleculesIV number of atoms

A II B I and II C II and III D II, III and IV

21 100 cm3 of hydrogen is reacted with 200 cm3 of oxygen. What volume (at r.t.p) ofoxygen remains?

A 50cm3 B 100cm3 C 150cm3 D 200 cm3

22 In the Haber process, nitrogen and hydrogen react to form ammonia.

N2(g) + 3H2(g) 2NH3(g) H = 92 kJ

Which factor increases both the speed of reaction and the amount of ammoniaproduced?

A addition of a catalystB decreasing the temperatureC increasing the pressureD increasing the temperature

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23 The curve X below represents the results of the reaction between 1.0 g of granulated

zinc and an excess of acid at 30 C. Which one of the following changes will produce

curveY?

A 0.5 g of granulated zinc at 20 C

B 0.5 g of powdered zinc at 30 C

C 1.0 g of granulated zinc at 20 C

D 1.0 g of powdered zinc at 30 C

24 The table shows the energy released by the complete combustion of some compounds

used as fuels.

compound formula Mr H in kJ/mol

methane CH4 16 - 880

ethanol C2H5OH 46 - 1380

propane C3H8 44 - 2200

heptane C7H16 100 - 4800

Which fuel produces the most energy when 1 g of the compound is completely burnt?

A ethanol B heptane C methane D propane

25 In which of the following does nitrogen have an oxidation state of +4?

A HNO3 B NO2 C N2O D NaNO2

26 Metal Z is placed between zinc and iron in the reactivity series. Which statement is likelyto be correct?

A A heated mixture of zinc and the oxide ofZ will react.B Iron will displace Z from an aqueous solution of its chloride.C Z will not react with hot dilute hydrochloric acid.D Z will react quickly with cold water.

27 Which substance is added to the blast furnace to remove impurities from iron ore?

A carbon B haematite C limestone D slag

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28 Which change occurs when the percentage of carbon in steel is increased?

A The steel becomes harder.B The steel becomes more malleable.C The steel becomes softer.D The steel corrodes easily.

29 Carbon and silicon are in the same group of the Periodic Table, and silicates are thesilicon analogue of carbonates. What is the formula of sodium silicate?

A NaSiO2 B NaSiO3 C Na2SiO3 D Na2SiO4

30 Which statement about the Periodic Table is correct?

A Atoms of elements in the same Group have the same number of electrons.

B All Groups contain both metals and non-metals.C There are more metallic elements than non-metallic elementsD In every Group, the melting points decrease with increasing proton number.

31 Which element is most likely to be a transition element?

element melting point(oC)

density(g/cm3)

number of different compoundsformed with chlorine

A -220 0.002 3

B 113 2.1 3

C 1280 1.9 1

D 1540 7.9 2

32 The table gives the composition of the atmosphere of four newly discovered planets.

planet composition of atmosphere

W

X

YZ

argon, carbon dioxide and oxygen

argon, nitrogen and oxygen

argon, carbon dioxide and methanemethane, nitrogen and oxygen

On which planets is the greenhouse effect likely to occur?

A W onlyB W, X and ZC W andY onlyD W,Y and Z

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33 The apparatus shown was set up with 100 cm 3 volume of air in the tube. The volume

of gas in the tube was measured at intervals for six days.

Which graph best represents how the volume of gas changes with time?

A B

C D

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moist iron filings

graduated tube

atmospheric air

water


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34 Which of the following gases cannot be removed from the exhaust gases of a petrolpowered car by its catalytic converter?

A carbon dioxide

B carbon monoxide

C hydrocarbons

D nitrogen dioxide

35 Aspirin is a drug which is used as a general painkiller. The structural formula of aspirinis shown below.

Which statement about aspirin is not correct?

A It decolourises aqueous bromine.

B Its aqueous solution reacts with sodium carbonate.C It turns acidified aqueous potassium dichromate (VI) from orange to green.D It is formed from an alcohol and a carboxylic acid.

36 The diagram shows the structure of the compound 1,3-butadiene.

How many molecules of iodine are needed to saturate one molecule of 1,3-butadiene?

A 1 B 2 C 3 D 4

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37 Five structures are shown.

1 2 3

4 5

Which structures represent identicalmolecules?

A 1 and 3 only

B 2 and 3 only

C 1, 3 and 4 only

D 1, 3 and 5 only

38 Biodiesel is made from a vegetable oil by the following reaction. Biodiesel can replacediesel as an alternative fuel in vehicle engines.

What type of compound are vegetable oil and biodiesel?

A alcoholsB carboxylic acidsC estersD saturated hydrocarbons

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39 When ethanol is left standing in the air for some time it becomes acidic. Whichequation represents this change?

A CH3CH2OH + CO CH3CH2CO2H

B CH3CH2OH + O2 CH3CO2H + H2O

C CH3CH2OH + 3O2 2CO2 + 3H2O

D 2CH3CH2OH + O2 2CH3CO2H + 2H2

40 Terylene (a polyester) is made by condensation polymerisation of the two monomersshown.

and

What is the repeat unit of the polymer?

A

B

C

D

End of Paper

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DATA SHEET

Colours of Some Common Metal Hydroxides

calcium hydroxide white

copper(II) hydroxide light blue

iron(II) hydroxide green

iron(III) hydroxide red-brown

lead(II) hydroxide white

zinc hydroxide white

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Pei Hwa Chem Prelim P1 2012 Qn