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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.

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

91 questions
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Question 1 of 20 91 total questions
Question 1
waec 2013
Which of the following statements about thermoplastic material is correct? They
Ado not melt on heating
Bharden on heating
Cdecompose on heating
Dsoften and melt on heating
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Question 2
waec 2013

Bronze is a mixture of

ACu and Mg
BCu and Sn
CCu and Zn
DCu and Pb
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Question 3
waec 2013
Which of the following materials is classified as a non-biodegradable pollutant?
AAnimal hide
BPaper
CPlastic
DWood
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Question 4
waec 2013
Which of the following statements about fine chemical is correct? It
Ais injurious to health
Bhas low degree of purity
Cis produced in relatively small amount
Dcan be stored for a long time
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Question 5
waec 2013
Which of the following raw materials is used in a plastic industry?
AEthene
BMethane
CCalcium
DHydrogen
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Question 6
waec 2013
The main function of limestone in the blast furnace is to
Aact as catalyst
Bact as reducing agent
Cremove impurity
Dsupply carbon (IV) oxide
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Question 7
waec 2013
A hydrocarbon compound contains 92.3% carbon Determine its empirical formula [H = 1.00; C = 12.0]
ACH
BCH2-
CCH3
DC3H2
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Question 8
waec 2013
Which of the following reactions is common to all hydrocarbones?
ACombustion
BAddition
CPolymerization
DCondensation
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Question 9
waec 2013

How many isomers has C\(_3\)H\(_6\)CI\(_2\)?

A2
B3
C4
D5
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Question 10
waec 2013
Which of the following organic compounds would decolourize bromie water?
ABenzene
BCyclobutane
CHexane
DPentane
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Question 11
waec 2013
The major product formed by the reaction between ethanoic acid and aqueous sodium hydroxide is
Asoap
Bsodium ethanoate
Csodium methoxide
Dwater
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Question 12
waec 2013
The separation of petroleum fractions depends on the differences in their
Amelting points
Bmolar masses
Csolubilities
Dboiling points
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Question 13
waec 2013
Consider the redox reaction as represented by the following equation: 12(aq) + 2S2O32-(aq) → 21-(aq) + S4O62-(aq). Which of the species in the equation is reduced?
AS4O62-(aq)
BS4O32-(aq)
C12(aq)
D1-(aq)
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Question 14
waec 2013

Which of the following cells produce electrical energy from chemical reactions?
l. Lead-acid battery ll. Dry cell III. Deniell cell IV Electrolytic cell

Al and ll only
Bl, ll, and III only
Clll and IV only
DI and III only
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Question 15
waec 2013

Consider the reaction represented by the equation: N\(_2\)O\(_4\)(g) ⇌ 2NO\(_2\)(g) ; ∆H = + x kJmol-1
What happens when the temperature is reduced at equilibrium?

AConcentration of N 2O4(g) decreases
BConcentration of N 2O4(g) increases.
CPressure exerted by the gases increases
DPressure exerted by the gases remains constant
View Explanation & Discuss
Question 16
waec 2013
The following factors affect the solubility of a solid in a given solvent except
Anature of solute
Bnature of solvent
Cpressure
Dtemperature
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Question 17
waec 2013
A substance is said to be impure if
Aits melting point range is wide
Bit dissolves in water with difficult
Cit has a low melting point
Dit is coloured
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Question 18
waec 2013
Which of the following compounds crystallizes without water of crystallization?
AMgSO4
BNa2CO3
CNaCI
DFeSO4
View Explanation & Discuss
Question 19
waec 2013

Which of the following acids would readily react with CaCO3 to liberate CO2?

ACH3COOH
BH2SO4
CH2SO3
DHNO3
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Question 20
waec 2013
The aqueous solution which has pH > 7 is
AFeCI3(aq)
BCuSO4(aq)
CKNO3(aq)
DNa2CO3(aq)
View Explanation & Discuss
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