Chemistry Past Questions

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100 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

100 questions
Question 1 of 20 100 total questions
Question 21
waec 2016

An unsaturated solution differs from a saturated solution at a given temperature because it

ACannot dissolve more solute
BCan hold more solute than it can actually dissolve
CCan still dissolve more solute at given temperature
DForm crystal more easily on cooling
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Question 22
waec 2016
Aluminium is used in the manufacture or aircraft because it
AIs hard and brittle
BIs light and resists corrosion
CHas high density and conducts electricity
DIs malleable and ductile
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Question 23
waec 2016
Metals can be stretched into wires because they are
ADuctile
BGood conductors
CLustrous
DMalleable
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Question 24
waec 2016
The mass of potassium hydroxide required to make 300.ocm3 of 0.4 moldm-3 solution is {KOH = 56.0}
A26.88g
B13.44g
C6.72g
D3.36g
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Question 25
waec 2016
Chemicals that are produced in small quantities and with very degree of purity are
ABulk chemicals
BFine chemicals
CHeavy chemicals
DLight chemicals
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Question 26
waec 2016

The boiling points of HF, H2O and NH3 increase in the order of

ANH3
BH2O < HF
CHF < NH3 < H2O
DNH3 < HF < H2O
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Question 27
waec 2016

When element \(_{20}\)Y combines with element \(_8\)Z, it forms

AA covalent compound , YZ is formed
BA covalent compound, ZY is formed
CAn ionic compound, YZ is formed
DAn ionic compound, ZY is formed
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Question 28
waec 2016

How many electrons are present in \(^9_4Be^{2+}\)?

A2
B4
C5
D6
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Question 29
waec 2016
An atom X consist of 6 protons, 6 electrons and 7 neutrons. Which of the following representations of the atom is correct?
A136X
B137X
C196X
D197X
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Question 30
waec 2016
The following atoms of carbon 126C, 136C and 146C can be described as?
AAllotropes
BIsomers
CIsotopes
DIsotones
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Question 31
jamb 2016
N2O4(aq) \(\rightleftharpoons\) 2NO2(g) \(\bigtriangleup\)H = +ve

In the reaction above, an increase in temperature will
AIncrease the reactant production
BIncrease the value of the equilibrium constant
CShift the equilibrium to the left
DDecrease the value of the equilibrium constant
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Question 32
jamb 2016
CH4(g) + CI2(g) \(\to\) CH2CI(s) + HCIg

The major factor that influences the rate of the reaction above is
AConcentration
BCatalyst
CTemperature
DLight
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Question 33
jamb 2016

From the diagram above, an ideal gas can be represented by

AK
BM
CL
DN
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Question 34
jamb 2016

The curve depicts titration between a strong acid of pH

AStrong acid and strong base
BStrong acid and weak base
CWeak acid and weak base
DWeak acid and strong base
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Question 35
jamb 2016

The diagram represents

AA spontaneous reaction
BAn exothermic reaction
CA non-spontaneous
DAn endothermic reaction
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Question 36
jamb 2016
In the diagram above, X is the
AEnthalphy
BActivated complex
CActivation energy
DEnthalphy change
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Question 37
jamb 2016

The functional groups present in the compound above are

AAlkene and halo-group
BHydroxyl and chloro-group
CAlkene and chloro-group
DHydroxyl and halo-group
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Question 38
jamb 2016
n monosaccharide \( \underset{Q}{\stackrel{P}{\rightleftharpoons}} \) polysaccharide -n water.

In the process above, P and Q respectively represent
ACondensation and hydrolysis
BFermentation and condensation
CPolymerization and hydrolysis
DPolymerization and condensation
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Question 39
jamb 2016

The compound above exhibits

AGeometric isomerism
BPositional isomerism
CStructural isomerism
DOptical isomerism
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Question 40
jamb 2016

MnO\(_4\)(aq) + Y + 5Fe\(^{2+}\) (aq) \(\mapsto\) Mn\(^{2+}\) (aq) + 5Fe\(^{3+}\) (aq) + 4H\(_2\)O (l).

In the equation above, Y is

A10H+ (aq)
B5H+ (aq)
C8H+ (aq)
D4H+ (aq)
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