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.

47 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

47 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 20 47 total questions
Question 1
jamb 2011
The principle of column chromatography is based on the ability of the constituents to
Amove at different speeds in the column
Bdissolve in each other in the column
Creact with the solvent in the column
Dreact with each other in the column
View Explanation & Discuss
Question 2
jamb 2011
choose the correct answer in the option above. Which of the following is a primary amine?
AA
BB
CC
DD
View Explanation & Discuss
Question 3
jamb 2011
In the diagram above , X is the ``
Aenthalpy
Benthalpy change
Cactivation energy
Dactivated complex
View Explanation & Discuss
Question 4
jamb 2011
with conc H2SO4 as catalyst
CH3COOH + C2H5OH → CH3COOC2H5 + H2O
Aesterification
BCondensation
Csaponification
Dneutralization
View Explanation & Discuss
Question 5
jamb 2011

Which of the following statements is true about 2-methylpropane and butane

AThey are not members of the same homologous series
BThey have the same boiling point
CThey have different number of carbon atoms
DThey have the same chemical properties
View Explanation & Discuss
Question 6
jamb 2011
Two organic compounds K and L were treated with a few drops of Fehling's solutions respectively . K formed a brick-red precipitate while L, remains unaffected. The compound K is an
Aalkanol
Balkane
Calkanal
Dalkanone
View Explanation & Discuss
Question 7
jamb 2011

The functional groups present in the compound above are

Aalkene and halo-group
Bhydroxyl and chloro-group
Calkene and chloro-group
Dhydroxyl and halo-group
View Explanation & Discuss
Question 8
jamb 2011

The number of isomers that can be obtained from C\(_4\)H\(_{10}\) is

A3
B4
C1
D2
View Explanation & Discuss
Question 9
jamb 2011
At 25o and zymase as catalyst,
C6H126 → 2C2H5OH + 2CO2 + energy
The reaction above represented by the equation above is useful in the production of
Apropanol
Bbutanol
Cmethanol
Dethanol
View Explanation & Discuss
Question 10
jamb 2011
An organic compound has an empirical formula CH2O and vapour density of 45.
What is the molecular formula?
[C = 12, H = 1, O = 16]
AC3H7OH
BC2H5OH
CC3H6O3
DC2H4O2
View Explanation & Discuss
Question 11
jamb 2011
Which of the following compounds will undergo polymerization reaction?
AC2H4
BC2H5COOH
CC2H6
DC2H5OH
View Explanation & Discuss
Question 12
jamb 2011
The ability of carbon to form long chains is referred to as
Aalkylation
Bacylation
Ccatenation
Dcarbonation
View Explanation & Discuss
Question 13
jamb 2011
The constituents of baking powder that makes the dough to rise is
ANaHCO3
BNaOH
CNa2CO3
DNaCl
View Explanation & Discuss
Question 14
jamb 2011
Bronze is preferred to copper in the making of medals because it
Ais stronger
Bcan withstand low temperature
Cis lighter
Dhas low tensile strength
View Explanation & Discuss
Question 15
jamb 2011

The property of concentrated H2SO4 that makes it suitable for preparing HNO3 is its

Aboiling point
Bdensity
Coxidizing properties
Ddehydrating properties
View Explanation & Discuss
Question 16
jamb 2011
In the laboratory preparation of oxygen, dried oxygen is usually collected over
Ahydrochloric acid
Bmercury
Ccalcium chloride
Dtetraoxosulphate (VI) acid
View Explanation & Discuss
Question 17
jamb 2011
The bleaching action of chlorine gas is effective due to the presence of
Ahydrogen chloride
Bwater
Cair
Doxygen
View Explanation & Discuss
Question 18
jamb 2011

A few drops of concentrated HNO\(_3\) is added to an unknown solution and boiled for a while. If this produces a brown solution, the cation present is likely to be

APb2+
BCu2+
CFe3+
DFe2+
View Explanation & Discuss
Question 19
jamb 2011
The effect of the presence of impurities such as carbon and sulphur on iron is that they
Agive it high tensile strenght
Bmake it malleable and ductile
Cincrease its melting point
Dlower its melting point
View Explanation & Discuss
Question 20
jamb 2011

The impurities formed during the laboratory preparation of chlorine gas are removed by

AH2O
BNH3
CH2SO4
DHCl
View Explanation & Discuss
Question Navigator
Current
MathsFaculty