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.

75 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

75 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 75 total questions
Question 11
waec 1995
Consider the reaction represented by the equation below: XO + YO → X + YO2 In the reaction, YO acts as
Aan acidic oxide
Ba basic oxide
Ca reducing agent
Da weak base
Ean oxidizing agent
View Explanation & Discuss
Question 12
waec 1995

A positive brown ring test indicates the presence of

ANO 3
BFe 3+
CSO 2-3
DCU+
ENO- 2
View Explanation & Discuss
Question 13
waec 1995
The most suitable method for preparing lead (ll) chloride is by
Aaction of dilute HCI on PbSO 4
Bacts of dilute HCI on lead
Caction of dilute HCI on PbCO3
Dbubbling chlorine into a solution of Pb(NO3)2
Emixing aqueous solutions Pb(NO3)2 and NaCI.
View Explanation & Discuss
Question 14
waec 1995
Which of the following species is always present in acidified water?
ANH+4
BO 2-
CHCI
DH3O+
EHNO3
View Explanation & Discuss
Question 15
waec 1995

A weak acid is one which

Ais not corrosive
Bis slightly ionized in water
Cdoes not produce salts with alkalis
Ddoes not conduct an electric current in aqueous solution
Eforms acid salts with bases
View Explanation & Discuss
Question 16
waec 1995
What is the percentage by mass of copper in copper in copper (l) oxide (CU2O)? [O = 16; CU =64]
A88.9%
B80.0%
C66.7%
D20.0%
E11.1%
View Explanation & Discuss
Question 17
waec 1995
Which of the following cannot be deduced from the electronic configuration of a transition metal?
APossession of magnetic property
BAbility to form complex ions
CPosition in the Periodic Table
DVariable oxidation states
EPhysical properties of the metal
View Explanation & Discuss
Question 18
waec 1995
Which of the following molecules is linear in shape?
ACH4
BH2O
CNH3
DH2S
ECI2
View Explanation & Discuss
Question 19
waec 1995
If a solid has a low melting point and dissolves readily in benzene, it would probably
Acontain strong electrostatic forces of attraction
Bconduct electricity in the molten state
Cdissolve in water
Dhave covalent bonding
Eabsorb moisture on exposure to air
View Explanation & Discuss
Question 20
jamb 1995

The functional group represented in the compound above is?

Aalkanol
Balkanal
Calkanone
Dalanoate
View Explanation & Discuss
Question 21
jamb 1995

The option above shows the PH changes for the titration of a

Astrong acid versus strong base
Bweak acid versus strong base
Cstrong acid versus weak base
Dweak acid versus weak base
View Explanation & Discuss
Question 22
jamb 1995

It can be deduced that the rate of the reaction?

Afor path l is higher than path ll
Bfor path ll is higher than path l
Cis the same for both paths at all temperatures
Ddepends on the values of both x and y at all pressures
View Explanation & Discuss
Question 23
jamb 1995

Use the diagram above to answer this question. The activation energy of the uncatalysed reaction is

AX
BX + Y
CX - Y
DY
View Explanation & Discuss
Question 24
jamb 1995

The arrangement above can be used for the collection of

Asulphur (IV) oxide
Bammonia
Chydrogen chloride
Dnitrogen
View Explanation & Discuss
Question 25
jamb 1995
USE THE SECTION OF THE PERIODIC TABLE ABOVE TO ANSWER THIS QUESTION.Which letter represents a non-metal that is a solid at room temperature?
AT
BR
CJ
DX
View Explanation & Discuss
Question 26
jamb 1995

USE THE SECTION OF THE PERIODIC TABLE ABOVE TO ANSWER THIS QUESTION.Which of the indicate an alkali metal and a noble gas respectively?

AM and E
BG and E
CR and L
DG and L
View Explanation & Discuss
Question 27
jamb 1995
The relatively high boiling points of alkanols are due to?
Aionic bonding
Baromatic character
Ccovalent bonding
Dhydrogen bonding
View Explanation & Discuss
Question 28
jamb 1995
An example of a secondary amine is?
Apropylene
Bdi-butylamine
Cmethylamine
Dtrimethylamine
View Explanation & Discuss
Question 29
jamb 1995
CxHY + 4O2 → 3CO2 + 2H2O. The hydrocarbon, CxHY, in the reaction above is?
Apropane
Bpropene
Cpropyne
Dpropanone
View Explanation & Discuss
Question 30
jamb 1995
The role of sodium chloride in the preparation of soap is to?
Apurify the soap
Bseparate the soap from glycerol
Caccelerate the decomposition of the fat or oil
Dreact with glycerol
View Explanation & Discuss
Question Navigator
Current
MathsFaculty