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.

89 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

89 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 89 total questions
Question 41
jamb 2007

Cu\(^{2+}\)(aq) + 4NH\(_3\)(g) ↔ [Cu(NH\(_3\))\(_4\)]\(^{2+}\)(aq)
In the reaction above, what is the effect of precipitating Cu\(^{2+}\)(aq) as CuS(s)?

ANH3(g) concentration will decrease
Bmore NH3(g)
CThe equilibrium will shift to the right
DThere will be no effect
View Explanation & Discuss
Question 42
jamb 2007

The tincture of iodine means iodine dissolved in

Aethanol and water
Bbromine chloride
Cchlorine water
Dwater
View Explanation & Discuss
Question 43
jamb 2007

Na\(_2\)S\(_2\)O\(_3\)(aq) + 2HCl(aq) → 2NaCl(aq) + H\(_2\)O(l)
Which of the following would introduce the greatest increase in the rate of the chemical reaction above?

AAn increase in temperature and decrease in the concentration of the reactant
BA decrease in the volume and increase in the pressure of the reactant
CA decrease in the temperature and an incease in the concentration of the reactant
DAn increase in temperature and an increase in the concentration of the reactant
View Explanation & Discuss
Question 44
jamb 2007

The reddish-brown rust on iron roofing sheets consists of

AFe3+(H2O)6
BFeO.H2O
CFe2O3.3H2O
DFe3O4.2H2O
View Explanation & Discuss
Question 45
jamb 2007

The soft solder used for welding and plumbing is alloy of

Alead and tin
Biron and tin
Clead and zinc
Diron and zinc
View Explanation & Discuss
Question 46
jamb 2007

A solution which on treatment with hydrochloric acid produces a colourless, odourless gas which turns lime water milky is most likely to be a

Atrioxonitrate (V)
Bchloride
Ctrioxocarbonate (IV)
Dhydroxide
View Explanation & Discuss
Question 47
jamb 2007

When calcium oxide is heated with carbon, the oxide will

Abe converted to carbide
Bbe converted to the trioxocarbonate (IV) salt
Cdecompose to the metal
Dmelt, producing carbon (IV) oxide
View Explanation & Discuss
Question 48
jamb 2007

An element used in the production of matches is

Anitrogen
Baluminium
Ccopper
Dsulphur
View Explanation & Discuss
Question 49
jamb 2007

Trioxonitrate (V) acid is not used for preparing hydrogen gas from metals because it

Ais strongly oxidizing
Bis volatile
Crenders the metal passive
Dforms a layer of oxide on the metal
View Explanation & Discuss
Question Navigator
Current
MathsFaculty