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ZIMSEC O Level · 5071/1 · N2013

Chemistry Paper 1 November 2013

Questions
39 of 40
Time allowed
60 min
Syllabus code
5071/1

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Questions
39
Pass mark
24
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Answer every question in the printed order, get marked at the end, then see the answers.

The questions

Question 1

Which one is an example of a change of state?
  1. Acrushing limestone into powder
  2. Bwarming ice in a glass tube
  3. Cconcentrating ethanol solution
  4. Dsieving a mixture of sand and salt

Question 2

Which gas has the fastest rate of diffusion?
  1. Aammonia
  2. Bcarbon dioxide
  3. Cnitrogen dioxide
  4. Dmethane

Question 3

The purity of a substance is determined by comparing experimental and theoretical values of
  1. Asolubility.
  2. Bmelting point.
  3. Cweight.
  4. Ddensity.

Question 4

A 45 cm3^3 of water were mixed with 45 cm3^3 of alcohol. The total volume was 87 cm3^3.

Which is the best explanation for this observation?

  1. Asome alcohol molecules evaporate
  2. Bwater and alcohol react to form a gas which escapes
  3. Calcohol molecules fit into gaps between water molecules
  4. Dwater and alcohol react to produce a salt which then dissolves

Question 5

Paper chromatography is used to separate dyes in ink because the dyes have different
  1. Asolubilities.
  2. Bviscosities.
  3. Ccolours.
  4. Dvolatilities.

Question 6

The diagram shows a chromatogram obtained using solutions of four single dyes.

Which solution is impure?

  1. ABlue only
  2. BGreen only
  3. CRed only
  4. DBlack only

Question 7

Which statement about graphite is correct?
  1. AIt has a tetrahedral structure.
  2. BIt has a hexagonal structure.
  3. CIt has a hard transparent structure.
  4. DIt has a square planar structure.

Question 8

An ion with a charge of +2 and the same electronic configuration as the chloride ion is the
  1. Aphosphide ion.
  2. Bsulphide ion.
  3. Cmagnesium ion.
  4. Dcalcium ion.

Question 9

The symbol of a particle with 10 electrons, 7 protons and 8 neutrons is
  1. ANe.
  2. BF−^-.
  3. CO2−^{2-}.
  4. DN3−^{3-}.

Question 10

The table shows the mass numbers of atoms M, N, O and P.

Which atoms are isotopes?

  1. AM and N
  2. BN and O
  3. CO and P
  4. DN and P

Question 11

The diagram shows arrangement of electrons in a particle.

Which is the correct symbol for the particle?

  1. ANe
  2. BO2−^{2-}
  3. CN3−^{3-}
  4. DN3+^{3+}

Question 12

What is the empirical formula of the organic compound shown?
  1. ACH2_2O
  2. BC2_2H4_4O
  3. CC2_2H4_4O2_2
  4. DC4_4H8_8O2_2

Question 13

What is the mass of oxygen in 10 g of sodium hydroxide?
  1. A0.25 g
  2. B0.6 g
  3. C4.0 g
  4. D16 g

Question 14

A certain quantity of the compound Al2l_2(CO3_3)3_3 decomposed to produce 1.32 mol of All.

The number of moles of carbon present in the compound were

  1. A1.00.
  2. B1.32.
  3. C1.98.
  4. D3.00.

Question 15

A chemical formula of a compound
  1. Ashows the oxidation number of elements of the compound.
  2. Bshows the exact number of atoms present in the compound.
  3. Cshows the exact relative molecules mass of the compound.
  4. Dis the same as the empirical formula of the compound.

Question 16

What is the empirical formula of a compound which contains 64% Nitrogen and 36% oxygen by mass?
  1. ANO
  2. BNO2_2
  3. CN2_2O
  4. DN2_2O5_5

Question 17

Which is the correct formula for ammonium sulphate?
  1. ANH4_4SO4_4
  2. BNH3_3SO4_4
  3. C(NH4_4)2_2SO4_4
  4. D(NH3_3)2_2SO4_4

Question 18

A child spilled 500 cm3^3 of 10 moldm−3^{-3} HCll on a desk by mistake.

Which solution must the child use to neutralise all the acid?

  1. A1 000 cm3^3 of 5 moldm−3^{-3} NaOH
  2. B200 cm3^3 of 5 moldm−3^{-3} NaOH
  3. C500 cm3^3 of 5 moldm−3^{-3} NaOH
  4. D500 cm3^3 of 1 moldm−3^{-3} NaOH

Question 19

What is the oxidation number of nitrogen in NO3−_3^-?
  1. A+3
  2. B+6
  3. C+5
  4. D−5-5

Question 20

In the circuit shown, the ammeter showed that no current was flowing.

What could be the best explanation for this observation?

  1. Aelectrodes Y and Z are made up of the same element
  2. Belectrodes Y and Z are made up different elements
  3. Cliquid X does not have free ions
  4. Dliquid X is an ionic compound

Question 21

In an experiment 5 cm3^3 of 1.0 moldm−3^{-3} sodium hydroxide were gradually added to 10 cm3^3 of 1.0 moldm−3^{-3} hydrochloric acid containing methyl orange indicator.

Which changes occurs in the mixture?

  1. Athe mixture becomes more basic
  2. Bthe mixture becomes more acidic
  3. Cthe mixture becomes less acidic
  4. Dthe mixture becomes neutral

Question 22

The apparatus shows the electrolysis of concentrated nickel chloride.

What reaction occurs at X?

  1. Aoxidation of chloride ions
  2. Breduction of chloride ions
  3. Coxidation of nickel ions
  4. Ddeposition of nickel atoms

Question 23

The conversion of starch to a simple sugar is an example of
  1. Acondensation.
  2. Bpolymerisation.
  3. Chydrolysis.
  4. Doxidation.

Question 24

Which method can be used to obtain the elements P and Q from the ionic compound PQ?
  1. Adistillation
  2. Belectrolysis
  3. Cprecipitation
  4. Dcrystallisation

Question 25

In which reaction is hydrogen acting as an oxidising agent?
  1. AH2_2 + CuO →\rightarrow H2_2O + Cu
  2. BMg + H2_2SO4_4 →\rightarrow MgSO4_4 + H2_2
  3. CH+^+ + OH−^- →\rightarrow H2_2O
  4. DN2_2 + 3H2_2 →\rightarrow 2NH3_3

Question 26

The reaction between magnesium oxide and nitric acid is an example of
  1. Aoxidation reaction.
  2. Breduction reaction.
  3. Cdisplacement reaction.
  4. Dneutralisation reaction.

Question 27

Which ion forms a green precipitate with ammonia solution?
  1. AAl3+l^{3+}
  2. BCu2+^{2+}
  3. CFe2+^{2+}
  4. DFe3+^{3+}

Question 28

Element Y reacts with water producing an acidic solution which gives a white precipitate with aqueous silver nitrate.

In which group of the Periodic Table is element Y?

  1. AV
  2. BVI
  3. CVII
  4. DVIII

Question 29

Which metal has the least tendency to form positive ions?
  1. Apotassium
  2. Bzinc
  3. Clead
  4. Diron

Question 30

The experiments shown were set up to compare effect of sacrificial protection by different metals.

In which tube(s) will the iron rust?

  1. AQ only
  2. BP only
  3. CR only
  4. Dall three

Question 31

When crystals of copper (II) sulphate are gently heated, the colour changes from blue to white because of
  1. Aloss of water only.
  2. Bloss of water and sulphur (IV) oxide.
  3. Closs of water, sulphur dioxide and oxygen.
  4. Dreaction with water vapour in the air.

Question 32

Sulphuric acid is produced by the process.

What is used in the industrial conversion of SO3_3 to H2_2SO4_4?

  1. Awater only
  2. Bsulphuric acid only
  3. Cwater followed by conc sulphuric acid
  4. Dconc sulphuric acid followed by water

Question 33

What process is used to extract silicon from silica?
  1. Aelectrolysis
  2. Bhydrolysis
  3. Creduction
  4. Dprecipitation

Question 34

What is the chemical formula for limestone?
  1. ACaO
  2. BCa(OH)2_2
  3. CCaCO3_3
  4. DCaHCO3_3

Question 35

During fermentation of glucose to ethanol, air should not enter the fermenting mixture because
  1. Aethanol will evaporate.
  2. Bethanoic acid will be formed.
  3. Czymase enzymes will be denatured.
  4. Dglucose will be oxidised to carbon dioxide and water.

Question 37

The diagrams show the structures of compounds S and T.

Which substance can be used to distinguish between S and T?

  1. Aoxygen
  2. Bbromine
  3. Chydrogen
  4. Dchlorine

Question 38

Ethene reacts with steam to form
  1. Aethane.
  2. Bethanoic acid.
  3. Cethanol.
  4. Dpolyethene.

Question 39

Which equation represents the complete combustion of C3_3H7_7OH?
  1. A2C3_3H7_7OH + 3O2_2 →\rightarrow 6C + 8H2_2O
  2. B2C3_3H7_7OH + 5O2_2 →\rightarrow 6CO2_2 + 8H2_2
  3. C2C3_3H7_7OH + 6O2_2 →\rightarrow 6CO + 8H2_2O
  4. D2C3_3H7_7OH + 9O2_2 →\rightarrow 6CO2_2 + 8H2_2O

Question 40

Polyethene can form carbon dioxide and water by the process of
  1. Acondensation.
  2. Bcombustion.
  3. Cfermentation.
  4. Dreduction.

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