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 20 50 total questions
Question 1
jamb 2000

The compound above is an

Aether
Bester
Calkanal
Dalkanol
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Question 2
jamb 2000

Use the option above to answer this question. The graph that describes a zero order reaction is

AA
BB
CC
DD
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Question 3
jamb 2000

The diagram above is the solubility curve of a solute, X. Find the amount of X deposited when 500cm3 of a solution of X is cooled from 60oC to 20oC.

A0.750 mole
B0.950 mole
C2.375 moles
D4.750 moles
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Question 4
jamb 2000

Sucrose is made up of

Aglucose and glucose
Bglucose and fructose
Cfructose and fructose
Dgalactose and glucose
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Question 5
jamb 2000

Alkanones are generally obtained by the oxidation of

Aprimary alkanols
Bsecondary alkanols
Ctertiary alkanols
Dalkanoic acid
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Question 6
jamb 2000

The reaction of carbide with water gives

Aethyne
Bethene
Cethane
Dethanal
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Question 7
jamb 2000

The chlorinated alkane often used industrially to remove grease is

Atetrachloromethane
Bchloromethane
Ctrichloromethane
Ddichlorometane
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Question 8
jamb 2000

The conditions necessary for the extraction of a water molecule from two molecules of ethanol are

Aless acid and lower temperature
Bexcess acid and a lower temperature
Cexcess acid and a higher temperature
Dless acid and a higher temperature
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Question 9
jamb 2000

Unsaturated organic compounds are identified by decolourization of

Asilver bromine and potassium tetraoxomanganate (VII) solutions
Bbromine water and acidified potassium tetraoxomanganate (VII) solution
Csilver bromide solution and bromine water
Dbromine water and alkaline potassium tetraoxomanganate (VII) solution
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Question 10
jamb 2000

The repeating unit in natural rubber is

Aalkyne
Bisoprene
Cn-propene
Dpeoprene
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Question 11
jamb 2000

The least easily oxidized of the metals below is?

ACa
BNa
CZn
DAl
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Question 12
jamb 2000

Haematite is an ore of

Azinc
Blead
Ciron
Dcopper
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Question 13
jamb 2000

A common characteristics of copper and silver in their usage as coinage metals is that they

Ahave high metallic lustre
Bare not easily oxidized
Care easily oxidized
Dare not easily reduced
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Question 14
jamb 2000

Potassium vapour burns with a

Ablue flame
Bbrick-red flame
Cviolet flame
Dgolden-yellow flame
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Question 15
jamb 2000

Synthesis gas is a mixture of

ACH4 and H2O
BCH4 and H2
CCO2 and H2
DCO and H2
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Question 16
jamb 2000

A form of carbon used for absorbing poisonous gases and purification of noble gases is

Awood charcoal
Banimal charcoal
Ccarbon fibres
Dcarbon black
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Question 17
jamb 2000

The refreshing and characteristic taste of soda water and other soft drinks is as a result of the presence in them of

Acarbon (IV) oxide
Bcarbon (II) oxide
Csoda
Dglucose
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Question 18
jamb 2000

A gas that is not associated with global warming is

ACO2
BSO3
CCH4
DH2
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Question 19
jamb 2000

The substance often used for vulcanization of rubber is

Achlorine
Bhydrogen peroxide
Csulphur
Dtetraoxosulphate (IV) acid
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Question 20
jamb 2000

A phenomenon where an element exist in different forms in the same physical state is known as

Aisomerism
Bamorphism
Callotropy
Disotopy
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