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.

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

50 questions
Question 1 of 10 50 total questions
Question 21
waec 2023

Which of the following statements is correct?

AAddition reactions occur between alkanes and chlorine.
BButane has a lower boiling point than propane.
CPentane has five isomers.
DAn alkane with 49 carbon atoms contains 100 hydrogen atoms
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Question 22
waec 2023

Dilute trioxonitrate (V) acid does not produce hydrogen when it reacts with metals because

Ait reacts with the product.
Bit is highly corrosive.
Cthere is no visible reaction.
Dit is a strong oxidizing agent.
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Question 23
waec 2023

Which of the following properties does not give evidence of the kinetic theory of matter?

ADiffusion
BMelting
CPolymerization
DEvaporation
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Question 24
waec 2023

Which of the elements in the table below would react more readily with chlorine?
      

Element

Ionization energy (KJ \(mol^{-1} \times 10^{-3}\))

W 12.0
X 21.0
Y 106.0
Z 200.0

 

AY and Z only
BX and Z only
CW and X only
DW and Z only
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Question 25
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 26
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 27
waec 2023

The following steps are scientific methods except

Aexperimentation
Bproblem identification
CAnalysis
DOpen-mindedness
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Question 28
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 29
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 30
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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