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.

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

138 questions
Question 1 of 18 138 total questions
Question 61
jamb 2023

What is the solubility product constant (Ksp) used for?

ATo measure the total mass of a solute that can dissolve in a solvent
BTo determine the concentration of a solute in a saturated solution
CTo calculate the solubility of a solute in a given solvent
DTo compare the solubilities of different solutes in the same solvent
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Question 62
jamb 2023

What is the chemical structure of soap and detergent molecules?

AHydrophilic head and hydrophobic tail
BHydrophilic head and hydrophilic tail
CHydrophobic head and hydrophobic tail
DHydrophilic tail and hydrophobic head
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Question 63
jamb 2023

What happens to the value of the equilibrium constant (Kc) for a reaction if the reaction is reversed?

AIt becomes zero
BIt becomes negative
CIt remains the same
DIt becomes the reciprocal of the original value
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Question 64
jamb 2023

Which of the following is an example of an endothermic reaction?

ACombustion of propane (C\(_3\)H\(_8\)) to produce carbon dioxide (CO\(_2\)) and water (H\(_2\)O).
BBurning of methane (CH\(_4\)) in the presence of oxygen
CFormation of table salt (NaCl) from sodium (Na) and chlorine (Cl\(_2\)).
DDecomposition of hydrogen peroxide (H\(_2\)O\(_2\)) into water (H\(_2\)O) and oxygen (O\(_2\)).
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Question 65
jamb 2023

Who proposed the planetary model of the atom with electrons orbiting the nucleus?

AErwin Schrödinger
BErnest Rutherford
CNiels Bohr
DJ.J. Thomson
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Question 66
jamb 2023

What is the name of the process by which ammonia is produced on an industrial scale?

ANitrogenation
BAmmoniation
CNitrification
DHaber process
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Question 67
jamb 2023

What is eutrophication?

AThe release of harmful chemicals into water bodies
BThe excessive growth of algae due to nutrient enrichment
CThe presence of heavy metals in water
DThe formation of oil slicks on water surfaces
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Question 68
jamb 2023

According to the kinetic theory of gases, the pressure exerted by a gas is due to

AThe vibrations of gas particles.
BThe weight of the gas particles
CThe attractive forces between gas particles
DThe collisions of gas particles with the container walls
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Question 69
jamb 2023

What is the sum of the oxidation numbers in a neutral compound?

A+2
B-1
C0
D+1
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Question 70
jamb 2023

Which of the following reactions would be expected to have the highest entropy change?

ALiquid → Gas
BSolid → Liquid
CGas → Liquid
DGas → Solid
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Question 71
jamb 2023

Which noble gas is radioactive and is produced as a decay product of uranium and thorium?

AArgon
BKrypton
CRadon
DNeon
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Question 72
jamb 2023

What happens to the position of equilibrium, if a reversible exothermic reaction is subjected to a decrease in temperature?

AThe position of equilibrium shifts to the left
BThe position of equilibrium shifts to the right.
CThe position of equilibrium remains unchanged
DThe reaction stops
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Question 73
jamb 2023
The gas given off when a metal reacts with an acid is
Anitrogen
Bchlorine
Chydrogen
Doxygen
Question 74
jamb 2023
An acid turns blue litmus paper
Ared
Bwhite
Cgreen
Dblue
Question 75
jamb 2023
The number of electrons in a neutral atom of atomic number 11 is
A12
B11
C23
D10
Question 76
jamb 2023
The pH of a neutral solution is
A7
B14
C1
D0
Question 77
jamb 2023
Which gas is most abundant in the atmosphere?
Anitrogen
Bcarbon dioxide
Coxygen
Dargon
Question 78
jamb 2023
The chemical symbol for sodium is
ANa
BS
CN
DSo
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