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.

64 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

64 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 4 64 total questions
Question 31
jamb 1998
8.0 g of an element X react with an excess of copper (ll) tetraoxosulphate (lV) solution to deposit 21.3 g of copper. The correct equation for the reaction is?

(Cu = 64).
AX(s) + CuSO4(aq) → Cu(s) + XSO4(aq)
BX(s) + 2CuSO4(aq) → 2Cu(s) + X(SO4)2(aq)
C2X(s) + CuSO4(aq) → Cu(s) + X2SO4(aq)
D2X(s) + 3CuSO4(aq) → 3Cu(s) + X2(SO4)3(aq)
View Explanation & Discuss
Question 32
jamb 1998

A given amount of gas occupies 10.0 dm3 at 4atm and 273°C. The number of moles of the gas present is?
(Molar volume of a gas at s.t.p. = 22.4 dm3)

A0.89 mol
B1.90 mol
C3.80 mol
D5.70 mol
View Explanation & Discuss
Question 33
jamb 1998
A mixture of iron and sulphur can be separated by dissolving the mixture in?
Asteam
Bdilute hydrochloric acid
Cdilute sodium hydroxide
Dbenzene
View Explanation & Discuss
Question 34
jamb 1998
The addition of water to calcium oxide leads to?
Aa physical change
Ba chemical change
Cthe formation of a mixture
Dan endothermic change
View Explanation & Discuss
Question Navigator
Current
MathsFaculty