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.

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

137 questions
Question 1 of 20 137 total questions
Question 21
jamb 2024

The reaction between alkanoic acids and alkanols in the presence of an acid catalyst is known as

Asaponification
Bdehydration
Cesterification
Dhydrolysis
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Question 22
jamb 2024

The amount of Faraday required to discharge 4.5 moles of Al\(^{3+}\) is

A13.5
B4.5
C7.5
D1.5
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Question 23
jamb 2024

An organic compound with general formula RCOR' is an

Aalkanone
Balkanal
Calkanoate
Dalkanoic acid
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Question 24
jamb 2024

The hybridization scheme in ethyne is

Asp
Bsp\(^3\)
Csp\(^2\)d
Dsp\(^2\)s
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Question 25
jamb 2024

C\(_2\)H\(_{4(g)}\)  +  3O\(_{2(g)}\) → 2CO\(_{2(g)}\)  +  2H\(_2\)O\(_{(g)}\)

The above equation represents the combustion of ethene.If 10cm\(^3\) of ethene is burnt in 50cm\(^3\) of oxygen, what would be the volume of oxygen that would remain at the end of the reaction?

A20cm\(^3\)
B40cm\(^3\)
C60cm\(^3\)
D50cm\(^3\)
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Question 26
jamb 2024

In a chemical reaction, surface area of reactants can affect

ACaCO\(_3\) + 2HCl → CaCl\(_2\) + H\(_2\)O + CO\(_2\)
BMgCl\(_2\) + H\(_2\)SO\(_4\) → MgSO\(_4\) + 2HCl
CH\(_2\) + Cl\(_2\) → 2HCl
DNaOH + HCl → NaCl + H\(_2\)O
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Question 27
jamb 2024

An oxide of nitrogen that can rekindle a glowing splint is 

Anitrogen(I)oxide
Bnitrogen(II)oxide
Cnitrogen(IV)oxide
Ddinitrogen tetraoxide
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Question 28
jamb 2024

Which of the following represents an order of increasing reactivity?

AAu < Cu < Sn < Fe < Ca
BCa < Fe < Sn < Cu < Au
CAu < Cu < Fe < Sn < Ca
DCa < Sn < Fe < Cu < Au
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Question 29
jamb 2024

The main constituent of water-glass is

Acalcium trioxosilicate(IV)
Bcalcium trioxosulphate(IV)
Csodium trioxosulphate(IV)
Dsodium trioxosilicate(IV)
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Question 30
jamb 2024

The term strong and weak acids is used to indicate the 

Anumber of H\(^+\) released by an acid
Bnumber of OH\(^-\) released by an acid
Cextent of ionization of an acid
Dstrength of its action on substance
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Question 31
jamb 2024

The reaction of hydrogen and chlorine to produce hydrogen chloride gas is explosive in 

Adiffused light
Bsunlight
Cinfrared light
DRaman light
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Question 32
jamb 2024

The electronic configuration of an atom of Nitrogen is 1s\(^2\) 2s\(^2\) 2p\(^1_x\) 2p\(^1_y\) 2p\(^1_z\) because the atom is

Ain an excited state
Bundergoing energy changes
Cunstable and ready to combine with another
Dsimply obeying rules governing electron configuration
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Question 33
jamb 2024

The Van der waals forces of attraction operates between

Aatoms
Bcations
Cmolecules
Danions
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Question 34
jamb 2024

If 11.0g of a gas occupies 5.6 dm\(^3\) at s.t.p., calculate its vapour density (1 mole of a gas occupies 22.4 dm\(^3\)).

A22
B44
C66
D88
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Question 35
jamb 2024

Solubility curve is a plot of solubility against 

Atemperature
Bpressure
Cvolume
Dconcentrate
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Question 36
jamb 2024

Nitrogen obtained from air is not absolutely pure because it contains the following except

Aoxygen
Bcarbon (IV)oxide
Cinert gases
Dwater vapour
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Question 37
jamb 2024

The indicator used in a titration between strong acid and weak base is

Amethyl orange
Bphenolphthalein
Cbromothymol blue
Dmethyl red
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Question 38
jamb 2024

A typical chemical reaction will be spontaneous if 

Aenthalpy change is negative
Bfree energy change is greater than one
Centropy change is zero
Denthalpy and free energy change are equal
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Question 39
jamb 2024

Kerosene is used as solvent for 

APaints
BSulphur
CGums
DFats
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Question 40
jamb 2024

The term that is not associated with petroleum industry is ?

ACracking
BSaponification
CPolymerization
DFermentation
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