Chemistry Past Questions

Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.

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 31
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 32
jamb 2016
The gas that is used for the treatment of cancer is
ANeon
BRadon
CXenon
DArgon
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Question 33
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 34
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 35
jamb 2016
An example of a solid emulsion is
AButter
BHair cream
CMilk
DCod-liver oil
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Question 36
jamb 2016

In a neutralization reaction involving HCI and NaOH using litmus as indicator, the colour at the end point is

ABlue
BRed
COrange
DPurple
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Question 37
jamb 2016

In the extraction of iron, the waste gas from the furnace is a mixture of

APH3 CO and CO2
BCO and C
CN2 , CO and CO2
DPH3 and CO
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Question 38
jamb 2016
The arrangement of particles in crystal lattices can be studied using
AX-rays
B\(\beta\)-rays
C\(\alpha\)-rays
D\(\gamma\)-rays
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Question 39
jamb 2016
The drying agent suitable for drying ammonia is
ACalcium Chloride
BCalcium Oxide
CPhosphorus(V) Oxide
DConcentrated H2SO4
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Question 40
jamb 2016

The number of electronic shells contained in an atom with electron configuration 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\)3P\(^6\)4S\(^2\) is

A3
B2
C4
D5
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Question 41
jamb 2016

Ethanol is soluble in water due to the presence of a

ACarbonyl group
BHydroxyl group
CPhenyl group
DMethyl group
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Question 42
jamb 2016
Diamond cannot be used
AIn making bicycle chains
BAs abrasives
CIn cutting glass and metals
DAs dies for drawing wires
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Question 43
jamb 2016

What volume of 0.5M H2SO4 will exactly neutralize 20cm3 of 0.1M NaOH Solution?

A2.0cm 3
B5.0cm 3
C6.8cm 3
D8.3cm 3
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Question 44
jamb 2016
An example of an acidic oxide is
ANO
BCO
CSO2
DCuO
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Question 45
jamb 2016

The metal whose ore can be concentrated by passing it through a magnetic separator is

AZn
BSn
CCu
DCa
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Question 46
jamb 2016
Which of the following statements is correct about the periodic table?
AElements in the same group have the same number of electron shells
BThe non-metallic properties of the elements tend to decrease across each period
CElements in the same period have the same number of valence electrons
DThe valence electrons of the elements increase progressively across the period
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Question 47
jamb 2016

Which of the following is not an alkali?

ACa(OH)2
BNH3
CNaOH
DAl(OH)3
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Question 48
jamb 2016

Alkanols have the general molecular formula

ACnH2n-2
BCnH2n+1CHO
CCnH2n-2OH
DCnH2n+1OH
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Question 49
jamb 2016

The products formed when primary Alkanols are oxidized using acidified potassium tetraoxomanganate (VII) are what?

ACH3CH2CHO and H2O
BCH3CHO and CO2
CCH3CH2COOH and H2
DCH3COOH and CO2
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Question 50
jamb 2016

Which of the following compounds is used as a gaseous fuel?

ACH3 -CH2 -CHO2 -COOH
BCH3 -C = CH
CCH3 -CH2 -CH2 -CH3
DCH2 -CH2 -CH3
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