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.

36 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

36 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 16 36 total questions
Question 11
waec 1996
What does X represent in the following equation? H 2(g) + 1/2O2(g) → H2O (l); ∆H = xKJ.
ABond energy
BActivation energy
CIonization energy
DEnthalpy of neutralization
EEnthalpy of formation
View Explanation & Discuss
Question 12
waec 1996
The rate of production of hydrogen gas from the reaction between zinc granules and hydrochloric acid can be increased by
Acooling the reaction mixture
Busing zinc powder instead of zinc granules
Cusing zinc rod instead of zinc granules
Dcarrying out the reaction at a higher pressure
Ecarrying out the reaction in a closed vessel
View Explanation & Discuss
Question 13
waec 1996
Which of the following is not correct about a catalyst? It
Aremains unchanged chemically at the end of a reaction
Bhelps to establish equilibrium faster reversible reaction
Ccan start a chemical rection which will normally not take place
Dis usually specific in its action
Ealters the rate of chemical reaction
View Explanation & Discuss
Question 14
waec 1996
Which of the following statements is not correct about electrolysis?
AReduction occurs at the anode
BAnions migrate to the anode
CPositive ions migrate to the cathode
DConcentration affects the discharge of ions
EElectrolytes conduct electric current
View Explanation & Discuss
Question 15
waec 1996
In which of the following compounds is the oxidation number of nitrogen equal to + 3?
ANO 2
BN 2O
CNO
DHNO2
EHNO3
View Explanation & Discuss
Question 16
waec 1996
An arrangement of two different metals in aqueous solutions of their salts to produce an electronic current is known as
Aelectrochemical cell
Bactivity series
Cthermocouple
Dvoltameter
Egalvanometer
View Explanation & Discuss
Question 17
waec 1996
The following acids are monobasic except
Atrioxonitrate (V) acid
Bhydrochloric
Cethanoic acid
Dtetraoxophosphorus (V) acid
Edioxonitrate (lll) acid
View Explanation & Discuss
Question 18
waec 1996
Amphoteric oxides are oxides which
Areact with water to form acids
Breact with water to form alkali
Cshow neither acid nor basic properties
Dreact with acids alkalis
Econtain high proportion of oxygen
View Explanation & Discuss
Question 19
waec 1996
Which of the following equations represents a neutralization reaction?
ACaCI2 + 2HCI →CI2 +CaCI 2 + H2O
BNa2O2 + H2SO4 → Na2SO4 + H2O2
CH2SO4 + KOH → KHSO4 + H2 O
D2Na + 2H2O → 2NaOH + H2
ECuSO4 + 2NaOH → Cu(OH)2+ Na2SO4
View Explanation & Discuss
Question 20
waec 1996
A solution of pH 7 is
Aacidic
Bneutral
Cconcentrated
Ddilute
Esaturated
View Explanation & Discuss
Question 21
waec 1996

What volume of carbon (lV) oxide is produced at s.t.p. when 2.5g of CaCO3 reacts with excess acid according to the following equation? CaCO3 + 2HCI → CaCI2 +H2O + CO2 [CaCO3 = 100; molar volume of a gas at s.t.p = 22.4dm3]

A11.20dm3
B5.60dm3
C2.24dm3
D0.56dm3
E0.28dm3
View Explanation & Discuss
Question 22
waec 1996
''Equal volumes of all gases at the same temperature and pressure contain the same number of molecules'' is an expression of
ACharles Law
BBoyle's Law
CAvogadro's Law
DGraham's Law
EGay Lussac's Law
View Explanation & Discuss
Question 23
waec 1996
What is the likely formula of compound formed between element M in group two and element X in group seven?
AM7X2
BM2X
CM2X7
DMX2
EMX6
View Explanation & Discuss
Question 24
waec 1996
The alkali metals exhibit similar chemical properties because
Athey occur in the combined state
Bthey have the same number of vallence electrons
Cthey form crystalline salts
Dtheir salts are soluble in water
Ethey are highly reactive
View Explanation & Discuss
Question 25
waec 1996

When an atom gains an electron, it becomes 

Achemically inactive
Bnegatively charged
Coxidized
Da cation
Ea complex ion
View Explanation & Discuss
Question 26
waec 1996
The existance of two or more forms of the same element in the same physical state is known as
Aallotropy
Bresonance
Chybridization
Disotopy
Eisomerism
View Explanation & Discuss
Question Navigator
Current
MathsFaculty