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.

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

88 questions
Question 1 of 20 88 total questions
Question 1
jamb 2023

Which of the following is a common laboratory indicator for bases?

AMethyl orange
BPhenolphthalein
CBromothymol blue
DLitmus
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Question 2
jamb 2023

What is the maximum number of electrons that can occupy the second energy level (n=2)?

A2 electrons
B18 electrons
C8 electrons
D32 electrons
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Question 3
jamb 2023

Which of the following statements is true for strong electrolytes?

AThey do not conduct electricity in the molten state
BThey completely dissociate into ions in solution
CThey are non-polar substances
DThey partially dissociate into ions in solution
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Question 4
jamb 2023

An element has an atomic number of 8 and a mass number of 16. How many neutrons does this element have?

A24
B16
C8
D32
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Question 5
jamb 2023

Which of the following statements is true regarding the melting and boiling points of pure substances?

AThe boiling point is always higher than the melting point
BThe melting point is always higher than the boiling point
CThe melting and boiling points are always the same for all substances
DThe melting and boiling points can vary depending on the substance
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Question 6
jamb 2023

What is the IUPAC name for the compound CCl\(_4\)?

ATetrahydrochloride
BTetrachloromethane
CCarbon tetrachloride
DChloroform
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Question 7
jamb 2023

The lanthanides and actinides are located in which block of the periodic table?

AP-block
BS-block
CF-block
DD-block
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Question 8
jamb 2023

Which of the following is a characteristic property of acids?

ATurn litmus paper blue
BBitter taste
CpH value above 7
DReact with metals to produce hydrogen gas
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Question 9
jamb 2023

Which of the following is an example of a primary cell?

AAlkaline battery
BNickel-cadmium battery
CLead-acid battery
DLithium-ion battery
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Question 10
jamb 2023

The process of rusting is an example of the formation of

ABasic oxide
BAcidic oxide
CReducing oxide
DAmphoteric oxide
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Question 11
jamb 2023

Chlorine gas is commonly used in the production of which of the following industrial compounds?

AChlorofluorocarbons (CFCs)
BMethane
CAmmonia
DEthanol
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Question 12
jamb 2023

What unit of temperature should be used when applying the ideal gas law?

AFahrenheit (°F)
BKelvin (K)
CRankine (°R)
DCelsius (°C)
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Question 13
jamb 2023

Which halogen is a gas at room temperature and is pale yellow in color?

AChlorine (Cl)
BFluorine (F)
CIodine (I)
DBromine (Br)
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Question 14
jamb 2023

The heat of reaction can be determined experimentally using a device called a

ACalorimeter
BBarometer
CSpectrometer
DThermometer
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Question 15
jamb 2023

What is the mass (in grams) of 500 mL of ethanol? (density of ethanol = 0.789 g/mL)

A394.5 mL
B500 mL
C394.5 g
D500 g
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Question 16
jamb 2023

Which of the following substances is NOT hygroscopic?

ASalt
BSugar
CSilica gel
DAluminum
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Question 17
jamb 2023

Which of the following mixtures is an example of a colloid?

AMilk
BOrange juice
CSaltwater
DSugar dissolved in water
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Question 18
jamb 2023

Why is water often referred to as the "universal solvent"?

AWater is the most abundant substance on Earth
BWater is essential for all living organisms.
CWater is involved in many chemical reactions
DWater can dissolve a wide variety of substances due to its polar nature
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Question 19
jamb 2023

Benzene can be converted to its derivative toluene by the addition of a methyl group. The reaction is an example of

ANucleophilic substitution
BElimination reaction
CElectrophilic substitution
DAddition reaction
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Question 20
jamb 2023

What is the main environmental concern associated with sulfur dioxide emissions?

AFormation of acid rain
BGlobal warming potential
CDepletion of the stratospheric ozone
DDepletion of the ozone layer
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