Chemistry Past Questions

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4,306 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

4,306 questions
Question 1 of 20 4,306 total questions
Question 591
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 592
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 593
waec 2016

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

A2
B4
C5
D6
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Question 594
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 595
waec 2016
The following atoms of carbon 126C, 136C and 146C can be described as?
AAllotropes
BIsomers
CIsotopes
DIsotones
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Question 596
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 597
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 598
jamb 2016

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

AK
BM
CL
DN
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Question 599
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 600
jamb 2016

The diagram represents

AA spontaneous reaction
BAn exothermic reaction
CA non-spontaneous
DAn endothermic reaction
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Question 601
jamb 2016
In the diagram above, X is the
AEnthalphy
BActivated complex
CActivation energy
DEnthalphy change
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Question 602
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 603
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 604
jamb 2016

The compound above exhibits

AGeometric isomerism
BPositional isomerism
CStructural isomerism
DOptical isomerism
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Question 605
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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Question 606
jamb 2016

A chemical reaction in which the hydration energy is greater than the lattice energy is referred to as

AA reversible reaction
BA spontenous reaction
CAn endothermic reaction
DAn exothermic reaction
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Question 607
jamb 2016
The gas that is used for the treatment of cancer is
ANeon
BRadon
CXenon
DArgon
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Question 608
jamb 2016
Calculate the volume in cm3 of oxygen evolved at s.t.p when a current of 5A is passed through acidified water for 193s?
[F = 96500 C mol1. Molar volume of a gas at s.t.p = 22.4dm3]
A0.056dm3
B0.224dm3
C224.000dm3
D56.000dm3
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Question 609
jamb 2016
An isotope has an atomic number of 15 and a mass number of 31. The number of proton it contains is
A16
B15
C31
D46
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Question 610
jamb 2016
An example of a solid emulsion is
AButter
BHair cream
CMilk
DCod-liver oil
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