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.

49 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

49 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 9 49 total questions
Question 21
jamb 1981

Sodium and potassium belong to the same group of the Periodic Table. This is because?

Aboth are metals
Bboth are soft and lighter than water
Cboth form cations by losing electrons
Dboth have identical electronic configuration
Eboth react with water vigorously
View Explanation & Discuss
Question 22
jamb 1981
The mass number of an atom is?
Athe number of electrons in the atom
Bthe number of protons in the nucleus of the atom
Cthe number of neutrons in the nucleus of the atom
Dthe sum of numbers of electrons and protons inthe atom
Ethe sum of numbers of proton and neutrons in the nucleus of the atom
View Explanation & Discuss
Question 23
jamb 1981
For iron to rust, there should be present?
Aoxygen
Bmoisture
Ccarbondioxide
Doxygen and moisture
Eoxygen, moisture and carbondioxide
View Explanation & Discuss
Question 24
jamb 1981
Methane is member of the homologous series called?
Aalkenes
Balcohols
Cesters
Dalkanes
Ealkynes
View Explanation & Discuss
Question 25
jamb 1981
The oxidation number of manganese in KMnO4 is?
A+1
B+3
C+5
D+7
E+2
View Explanation & Discuss
Question 26
jamb 1981
An example of a strong electrolyte is?
Aethyl acetate
Bethanol
Cglucose
Dsodium formate
Eformic acid
View Explanation & Discuss
Question 27
jamb 1981

When glowing splint is inserted into the mouth of a jar containing a gas, the splint is extinguished. The gas gives a white precipitate when passing into barium hydroxide. The gas is?

Amethane
Bhydrogen chloride
Chydrogen
Dnitrogen
Ecarbondioxide
View Explanation & Discuss
Question 28
jamb 1981
When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?
Ahydrogen
Bcarbon monoxide
Ccarbon dioxide
Dsulphur oxide
Echlorine
View Explanation & Discuss
Question 29
jamb 1981

An element X has 127 neutrons and 82 electrons.
Its atomic number is?

A209
B105
C45
D82
View Explanation & Discuss
Question Navigator
Current
MathsFaculty