Log In SignUp
Classroom

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
Download PHP app Ask a Question Check Syllabus Past Question Videos Topic Video Lessons

Take a test

Custom CBT

Create and set up a CBT environment with your preferred subjects.

JAMB CBT Simulator

Practice JAMB CBT with real UTME past questions in CBT format.

WAEC CBT Practice 2026 Simulator

CB-WASSCE styled past question practice.

NECO CBT Practice 2026 Simulator

SSCE & GCE styled past question practice.

Past Questions

4,306 questions
All JAMB WAEC NECO CUSTOM
All years 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978
Question 1 of 20 4,306 total questions
Question 861
waec 2010
Fact and oils are used as raw materials in the following industries except
Apaint industry
Bplastic industry
Cmargarine industry
Dcosmetics industry
View Explanation & Discuss
Question 862
waec 2010
The quantity of electricity required to discharge 1 mole of univalent ion is
A9,600 C
B48,250 C
C96,500 C
D193,00 C
View Explanation & Discuss
Question 863
waec 2010
What is the change in oxidation number of manganes in the reaction represented by the following equation? MnO-4(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l)
A+3 to + 2
B+ 4 to + 2
C+ 5 to + 2
D+ 7 to 2
View Explanation & Discuss
Question 864
waec 2010

Which of the following statements about the electrolysis of CuSO4(aq) using copper cathode and platinum anode is not correct?

ACopper is deposited at the cathode
BOxygen is liberated at the anode
Cit is used for the purification of copper
DThe solution becomes acidic
View Explanation & Discuss
Question 865
waec 2010

Which of the following statements about the cell notation Mg/Mg\(^{2+}\)//Cu\(^{2+}\)/Cu is correct?

Acopper is the anode
BManesium is reduced
CMagnesium is the anode
DThe double line represents the electrodes
View Explanation & Discuss
Question 866
waec 2010
The rate of chemical reaction of solids are not affected by
Acatalyst
Bpressure
Cparticle size
Dtemperature
View Explanation & Discuss
Question 867
waec 2010
Consider the equilibrium reaction represented by the following equation: 2SO2(g) + O2(g) ⇌ 2SO3(g); ∆H = 395.7 kJmol-1 Which of the following statements about the equilibrium system is correct?
AAddition of catalyst changes the equailibrium position
BDecrease in pressure increase in temperature SO3
CDecrease in pressure increases the equilibrium concentration of O2
DIncrease in temperatur favours the forward reaction
View Explanation & Discuss
Question 868
waec 2010
Which of the following factors would not affect the solubility of a gas?
AConcentration
BNature of solvent
CPressure
DTemperature
View Explanation & Discuss
Question 869
waec 2010
Which of the following chlorides is insoluble in water?
AAgCI
BKCI
CNH4CI
DZnCI2
View Explanation & Discuss
Question 870
waec 2010
The following substances are normal salts except
AAI(NO3)3
BFeSO4
CMg(OH)NO3
DNaCI
View Explanation & Discuss
Question 871
waec 2010
Which of the following equimolar solutions would have the highest conductivity?
ANH4NO3(aq)
BNaNO3(aq)
CMg(NO3)2(aq)
DAI(NO3)3(aq)
View Explanation & Discuss
Question 872
waec 2010
Which of the following oxides is basic?
ANO2
BAI2O3
CSO2
DCaO
View Explanation & Discuss
Question 873
waec 2010
The minimum amount of energy required for effective collisions between reacting particles is known as
Aactivation energy
Bbond energy
Ckinetic energy
Dpotential energy
View Explanation & Discuss
Question 874
waec 2010
The determination of heat of combustion is carried out with
Aa thermometer
Ba bomb calorimeter
Can evaporating dish
Da boiling tube
View Explanation & Discuss
Question 875
waec 2010

Which of the following gases contains the highest number of atoms at s.t.p?

A6 moles of neon
B3 moles of oxygen
C2 moles of chlorine
D1 mole of ethane
View Explanation & Discuss
Question 876
waec 2010
A given volume of oxygen diffused through a porous partition in 8 seconds. How long would it take the same volume of carbon (IV) oxide to diffuse under the same condition? [C = 12.0, O = 16.0]
A5.8 seconds
B6.8 seconds
C9.4 seconds
D11.0 seconds
View Explanation & Discuss
Question 877
waec 2010

Which of the following apparatus can be used to measure accurately a specific volume of a liquid?

ABeaker
BConical flask
CMeasuring cylinder
DPipette
View Explanation & Discuss
Question 878
waec 2010

What is the volume occupied by 2 moles of ammonia at s.t.p?

A44.8 dm-3
B22.4 dm-3
C11.2 dm-3
D5.6 dm-3
View Explanation & Discuss
Question 879
waec 2010
A solution of sodium trioxocarbonate (IV) contains 10.6g in 250cm3 of solution. Calculate the concentration of the solution. [Na2CO3 = 106.0]
A0.4 mol dm-3
B1.0 mol dm-3
C10.6 mol dm-3
D25.0 mol dm-3
View Explanation & Discuss
Question 880
waec 2010

Consider the neutralization reaction represented by the following equation: Na2CO3 + 2HNO 3 → 2NaNO3 + H2O + CO2 The stoichiometric ratio of acid to base is

A2:2
B2:1
C1:2
D1:1
View Explanation & Discuss
Question Navigator
Current
MathsFaculty