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.

100 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

100 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 20 100 total questions
Question 1
waec 2016
The alkanol obtained from the production of soap is
ADihydric Alkanol
BTertiary Alkanol
CTrihydric Alkanol
DMonohydric Alkanol
View Explanation & Discuss
Question 2
waec 2016
Which of the following metals is common to both brass and bronze?
AAluminium
BCopper
CLead
DIron
View Explanation & Discuss
Question 3
waec 2016

A consequences of global warming is

AAir pollution
BFlooding
CIncreased humidity
DWater pollution
View Explanation & Discuss
Question 4
waec 2016
Which of the following sources of energy contributes to green-house effect?
ANatural gas
BNuclear
CWind
DSolar
View Explanation & Discuss
Question 5
waec 2016
Consider the following reaction equation
C2H4(g) + 3O2(g) \(\to\) 2CO2(g) + 2H2O(l).

The volume of oxygen at s.t.p that will be required to burn 14g of ethene is
[C2H4 = 28; Molar volume of gas at s.t.p = 22.4dm3
A64.2dm3
B33.6dm3
C11.2dm3
D3.73dm3
View Explanation & Discuss
Question 6
waec 2016
Which of the following compounds is/are secondary alkanols?

i) CH3CH(CH3)CH3OH
ii) CH3CH2CH(OH)CH3
iii) CH3C(OH)(CH3)CH3
AI only
BII only
CI and III only
DII and III only
View Explanation & Discuss
Question 7
waec 2016

The compound that makes palm wine taste sour after exposure to the air for few days is

AEthanol
BEthanoic acid
CMethanol
DMethanoic acid
View Explanation & Discuss
Question 8
waec 2016
Ripening of fruits is hastened by using
AEthanol
BEthane
CEthene
DEthyne
View Explanation & Discuss
Question 9
waec 2016

When a compound X is heated with concentrated tetraoxosulphate(VI)acid, it produces an alkene. X is an

AAlkane
BAlkanol
CAlkanoate
DAlkyne
View Explanation & Discuss
Question 10
waec 2016
Amino acids are obtained from proteins by
AHydrolysis
BOxidation
CPolymerization
DReduction
View Explanation & Discuss
Question 11
waec 2016
Consider the following half-cell reactions.
Al(s) \(\to\) Al3+(aq) + 3e-
Cu2+(aq) + 2e- \(\to\) Cu(s)

The overall equation for the reaction is
AAl(s) + Cu2+(aq) \(\to\) Al3+(aq) + Cu(s)
B2Al(s) + Cu2+(aq) \(\to\) 2Al(aq) + Cu(s)
C2Al(s) + 3Cu2+(aq) \(\to\) 3Cu(s) + 2Al3+(aq)
D3Al(s) + 2Cu2+(aq) \(\to\) Cu(s) + 3Al3+(aq)
View Explanation & Discuss
Question 12
waec 2016

Consider the following ionic equation:
Cr\(_2\)O\(_7\)\(^{2-}\) + 14H\(^+\) + ne-  → 2Cr\(^{3+}\) + 7H\(_2\)O.
The value of n in the equation is_______?

A7
B6
C3
D2
View Explanation & Discuss
Question 13
waec 2016
The oxidation number of sulphur is +4 in
ANa2S>2O3
BH2SO3
CH2SO4
DSO3
View Explanation & Discuss
Question 14
waec 2016
Which of the following substances is a non-electrolyte?
AH2SO4
BCH3COOH
CC6H12O6
DNH4Cl
View Explanation & Discuss
Question 15
waec 2016
Chlorine water is used as a bleaching agent because it is
AAn acidic solution
BAn alkaline solution
CAn oxidizing agent
DA reducing agent
View Explanation & Discuss
Question 16
waec 2016
The quality of electricity required to discharge 1 mole of univalent ion is
A9600C
B48250C
C96500C
D193000C
View Explanation & Discuss
Question 17
waec 2016
A compound with molecular formula CH2O2 is
AA Carbohydrate
BA Carboxylic acid
CAn alkanol
DAn ester
View Explanation & Discuss
Question 18
waec 2016
Which of the following bonds are broken when ethanol is boiled?

I. Covalent bonds
II. Ionic bonds
III. Hydrogen bonds
AI only
BII only
CIII only
DI, II, III
View Explanation & Discuss
Question 19
waec 2016
Which of the following salts when dissolved in water will form a solution that will change blue litmus to red?
ACH3COONa
BNH4Cl
CNaCl
DKCl
View Explanation & Discuss
Question 20
waec 2016

On evaporation to dryness, 350cm\(^3\) of saturated solution of salt Z gave 55.5g of salt. What is the solubility of the salt? [Z = 101]

A1.57 moldm-3
B3.14 moldm-3
C6.28 moldm-3
D12.56 moldm-3
View Explanation & Discuss
Question Navigator
Current
MathsFaculty