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.

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 201
waec 2023

The formation of a bond between hydrogen and a highly electronegative atom results in

Apolarity
Belectrovalent bond.
Cdipole
Dmetallic bond
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Question 202
waec 2023

Alkenes can be manufactured by

Athe combustion of alkanes.
Bthe cracking of hydrocarbons.
Cpolymerization reactions.
Daddition of hydrogen to unsaturated vegetable oils.
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Question 203
waec 2023

The following steps are scientific methods except

Aexperimentation
Bproblem identification
CAnalysis
DOpen-mindedness
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Question 204
waec 2023

Which of the following reactions represents the hydrolysis of an alkanoate?

A\(CH_3COOH + OH^- ⇌H^+⇌ CH_3COO^- + H_2O\)
B\(CH_3COOH + C_2H_5OH ⇌H^+⇌ CH_3COOC_2H_5 + H_2O\)
C\(CH_3COOC_2H_5 + H_2O ⇌H^+⇌ CH_3COO^- + CH_3CH_2OH\)
D\(CH_3COOCH_2CH_3 + H_2O ⇌H^+⇌ CH_3COOH + CH_3CH_2OH\)
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Question 205
waec 2023

The following statements are correct except

Aenergy is released when liquids change to solids.
Bcarbon atoms in gaseous methane are further apart than those in solid diamond.
Cthere is large decrease in the volume of a solid metal when pressure is applied to it.
Dparticles move faster in the gaseous state than in the liquid state.
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Question 206
waec 2023

The vapour density of an organic compound with the molecular formula \(C_2H_4O_2\), is
[H=1.0, C=12.0, O= 16.0]

A40
B120
C65
D30
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Question 207
jamb 2023

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

AMethyl orange
BPhenolphthalein
CBromothymol blue
DLitmus
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Question 208
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 209
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 210
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 211
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 212
jamb 2023

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

ATetrahydrochloride
BTetrachloromethane
CCarbon tetrachloride
DChloroform
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Question 213
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 214
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 215
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 216
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 217
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 218
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 219
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 220
jamb 2023

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

ACalorimeter
BBarometer
CSpectrometer
DThermometer
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