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.

87 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

87 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 7 87 total questions
Question 41
jamb 2005

A concentrated solution containing H\(^+\), Cu\(^{2+}\), OH\(^-\) and Cl\(^-\) was electrolyzed using platinum electrodes.
The ion that will be discharged at the cathode is?

ACu2+
BCl-
CH+
DOH-
View Explanation & Discuss
Question 42
jamb 2005

2H\(_2\) + O\(_2\) → 2H\(_2\)O    ΔH = - 571kJ
In the equation above, how much heat will be liberated if 12.0g of hydrogen is burnt in excess oxygen?

A-1142 kJ
B-571 kJ
C+1142 kJ
D-1713 kJ
View Explanation & Discuss
Question 43
jamb 2005

In which of the following reactions can the oxidation number of the nitrogen be said to have increased?

A2NO(g) + O2(g) → 2NO2(g)
B2NO(g) + Cl2(g) → 2NOCl(l)
CFeSO4(aq) + NO(g) → Fe(NO)SO4(s)
DNO(g) + Br2(l) → 2NOBr(l)
View Explanation & Discuss
Question 44
jamb 2005

When iron is exposed to moisture and it rusts, the value of ΔG for the reaction is

Aneutral
Bzero
Cpositive
Dnegative
View Explanation & Discuss
Question 45
jamb 2005

Phenolphthalein in acidic solution is

Ared
Borange
Ccolourless
Dyellow
View Explanation & Discuss
Question 46
jamb 2005

Which of the following ions require the largest quantity of electricity for discharge at an electrode?

A4.0 moles of Cl-
B3.0 moles of Na+
C2.5 moles of Cu2+
D2.0 moles of Al3+
View Explanation & Discuss
Question 47
jamb 2005

Which of the following equimolar solutions will have the highest pH?

ACH3COOH
BNaOH
CHCl
DNH4OH
View Explanation & Discuss
Question Navigator
Current
MathsFaculty