ZIMSEC O Level Chemistry Paper 1 November 2014

Question 1

Which is the best way to test for the purity of propanoic acid?

Areact it with ethanol
Bmeasure its boiling point
Cburn it completely in oxygen
Dmeasure its pH

Question 2

The diagram shows ammonium chloride being heated.

Which process is taking place?

Aevaporation
Bcondensation
Cdistillation
Dsublimation

Question 3

The diagram shows a chromatogram obtained using solutions of three single dyes (blue, green and red) and four other solutions (A, B, C and D).

Which of the solutions A, B, C or D contains a dye other than blue, green and red?

Question 4

The diagram shows bonding between element Q and hydrogen. Only outer most electrons are shown.

To which group of the Periodic Table does element Q belong?

Question 5

In which set do all ions have the same total number of electrons?

AF $^-$ , Mg $^{2+}$ , Na $^+$
BLi $^+$ , Na $^+$ , K $^+$
CBe $^{2+}$ , Mg $^{2+}$ , Ca $^{2+}$
DS $^{2-}$ , O $^{2-}$ , C $l^-$

Question 6

The elements U, V and W have consecutive increasing atomic numbers.

If element U is a noble gas, what will be the symbol for the ion of the element W in its compounds?

AW $^-$
BW $^{2-}$
CW $^+$
DW $^{2+}$

Question 7

An element X has a proton number of 3. Which statement about X is correct?

AIt is in Group (III) of the periodic table.
BIt forms the chloride XC $l_3$ .
CIt forms ions by gaining electrons.
DIf forms the chloride XC $l$ .

Question 8

How many moles of oxygen molecules are required to oxidise four moles of sulphur dioxide to sulphur trioxide?

A1.0
B2.0
C3.0
D4.0

Question 9

Which hydrocarbon contains 80% by mass of carbon?

AC $_2$ H $_4$
BC $_2$ H $_6$
CC $_3$ H $_6$
DC $_4$ H $_{10}$

Question 10

A solution containing 0.1 moles XSO $_4$ combines with 5.4 g of water to form the hydrate XSO $_4$ . $n$ H $_2$ O.

What is the value of $n$ ?

Question 12

What is the % of carbon in the compound shown?

A32.1
B36.0
C48.6
D62.0

Question 13

An organic compound of M $_r$ 60 contains 6 g carbon, 1 g hydrogen and 8 g oxygen.

What is the molecular formula of the compound?

ACH $_2$ O
BC $_3$ H $_2$ O
CC $_2$ H $_4$ O $_2$
DC $_2$ H $_6$ O

Question 14

What is observed at the anode during electrolysis of copper (II) sulphate solution using copper electrodes.

Acopper thickens
Bcopper dissolves
Cgas bubbles
Dblue colour fades

Question 15

In the graph, curve Y represents the result of the reaction between 2.0 g of granulated zinc and an excess of acid at 30 $^\circ$ C.

Which change could produce curve X?

A2.0 g powdered zinc at 20 $^\circ$ C
B2.0 g granulated zinc at 40 $^\circ$ C
C1.0 g granulated zinc at 20 $^\circ$ C
D1.0 g granulated zinc at 40 $^\circ$ C

Question 16

Two reactants were mixed in a beaker, the mass of the beaker and contents was then recorded at various times. The graph shows the results.

Which pair of reactants produced this graph?

Aaqueous copper (II) sulphate and dilute nitric acid
Baqueous sodium carbonate and dilute nitric acid
Caqueous sodium hydroxide and aqueous zinc sulphate
Ddilute hydrochloric acid and aqueous sodium sulphate

Question 17

Magnesium and copper sulphate reacts as shown.

Mg + CuSO $_4$ $\rightarrow$ MgSO $_4$ + Cu

Which one is the oxidising agent?

Acopper
Bcopper sulphate
Cmagnesium
Dmagnesium sulphate

Question 18

The pH values of three liquids Q, R and T of equal concentration are shown in the diagram.

What could the aqueous solutions be?

AQ ethanoic acid, R potassium chloride, T sodium hydroxide
BQ potassium chloride, R ethanoic acid, T sodium hydroxide
CQ sodium hydroxide, R ethanoic acid, T potassium chloride
DQ ethanoic acid, R water, T potassium chloride

Question 19

Which compound gives a white precipitate with aqueous silver nitrate and a pale blue precipitate with aqueous sodium hydroxide?

Acopper chloride
Bcopper hydroxide
Ccopper sulphate
Dsilver sulphate

Question 20

The apparatus shown was used to detect an ion present in solution X.

Which ion was present in solution X if the damp litmus paper turned blue?

ANH $_4^+$
BCO $_3^{2-}$
CNO $_3^-$
DSO $_4^{2-}$

Question 21

The following observations were made on solution Z.

Ions present in Z are

AFe $^{2+}$ and I $^-$
BFe $^{2+}$ and C $l^-$
CFe $^{3+}$ and I $^-$
DFe $^{3+}$ and C $l^-$

Question 22

Which element reacts with cold water to form a soluble compound and an insoluble gas?

Amagnesium
Bzinc
Cpotassium
Daluminium

Question 23

A voltage is produced by the apparatus shown.

Which pair of metals Y and Z will produce the largest voltage?

AY iron, Z copper
BY magnesium, Z copper
CY zinc, Z copper
DY zinc, Z iron

Question 24

An element Q reacts in the following ways.

(i) 2Q + O $_2$ $\rightarrow$ 2QO
(ii) Q + 2HC $l$ $\rightarrow$ QC $l_2$ + H $_2$
(iii) QO + H $_2$ $\rightarrow$ no reaction

Which element is Q?

Acalcium
Bcopper
Clead
Dsilver

Question 25

Which substance cannot reduce iron (III) oxide to iron?

Acoke
Bcarbon monoxide
Ccarbon dioxide
Dmagnesium

Question 26

Which catalyst is used during hydrogenation?

Arodium/platinum
Bnickel
Cvanadium (V) oxide
DIron

Question 27

Which gas is the main cause of damage to buildings?

ACO $_2$
BCO
CCH $_4$
DSO $_2$

Question 28

The reaction between an alkene and bromine is

Aan addition reaction
Ba substitution reaction
Ca condensation reaction
Da reduction reaction

Question 29

Which substances contain the amide linkage shown?

Anylon and terylene
Bnylon and protein
Csugars and protein
Dterylene and sugar

Question 30

The diagram shows the structure of a monomer.

Which polymer can be made from this monomer?

Question 31

Which diagram shows the structure of a fire resistant polymer?

Question 32

The equation shows the cracking of the molecule C $_{20}$ H $_{42}$

C $_{20}$ H $_{42}$ $\rightarrow$ C $_{12}$ H $_{26}$ + X

What is X?

AC $_8$ H $_{12}$
BC $_8$ H $_{14}$
CC $_8$ H $_{16}$
DC $_8$ H $_{18}$

Question 33

A compound of molecular formula C $_2$ H $_4$ O $_2$ reacts with ethanol in the presence of concentrated sulphuric acid to form an ester.

What is the structural formula of the compound?

Question 34

Which test is used to identify an unsaturated hydrocarbon?

Aburn in air to form carbon dioxide and water
Breact with hydrogen to form a solid
Cshake with ethanol to give a white emulsion
Dreact with bromine water to decolourise it

Question 35

The general formula of an alkane of M $_r$ 58 is C $_n$ H $_{2n+2}$ .