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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.

168 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

168 questions
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Question 1 of 20 168 total questions
Question 1
neco 2009
The following equations represent redox reactions EXCEPT
ABa2+(aq) + SO2-4 (aq) → BaSO4(s)
BCl2(g) + 2Br- (aq) → 2CI - (aq) + Br2(g)
CFe2+(aq) + ½ C I2(aq) → Fe3+ (aq) + CI-(aq)
D2Fe3+(aq) + Sn2+(aq) → 2Fe2+(aq) Sn4+ (aq)
EZn(s) + CU2+(aq) → Zn2+(aq) + CU(s)
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Question 2
neco 2009
What volume of carbon (IV) oxide in dm 3 is produced at s.t.p. when 2.50g of CaCO3 reacts with excess acid according to the following equation? CaCO3(s) + 2HCI(aq) → CaCl2(aq) + H2O(1) + CO2(g)

[CaCO2 100; molar volume of a gas at s.t.p. = 22.4dm 3]
A0.28
B0.56
C2.24
D5.6
E11.2
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Question 3
neco 2009

Brain tumors can be located by using an isotope of

Acarbon - 14
Biodine 131
Ctechnetium 99
Duranium235
Euranium 238
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Question 4
neco 2009
During the extraction of iron in the blast furnance, slag is produced using
Acarbon
Bcrylite
Climestone
Doxygen
Esulphur
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Question 5
neco 2009
X = - log10 H+]

What does X stand for in the expression above?
ADegree of acidity
BEnthalpy change
CEquilibrium constant
DIonic product of water
ESolubility product
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Question 6
neco 2009

Which of the following gases is absorbed from the air due to photosynthesis?

ACarbon (II) oxide
BCarbon (IV) oxide
CNitrogen
DNoble gases
EOxygen
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Question 7
neco 2009
How many atoms of chlorine are required to saturate the double bonds of a compound containing a triene?
A2
B3
C4
D5
E6
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Question 8
neco 2009
All the following belong to the same family EXCEPT
Aglycerol
Bnylon
Cperspex polyethene
Dpolyethene
Epolystyrene
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Question 9
neco 2009
Ptotal = P1 + P2 + P3 +…………. Pn, is an expression of law
ABoyle’s
BCharles’
CDalton’s
DGraham’s
EGay Lussac’s
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Question 10
neco 2009

The following are ores of metals EXCEPT

Abauxite
Bdolomite
Cgraphite
Dhaematite
Emagnetite
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Question 11
neco 2009
The green house effect is a climatic condition associated with the presence of excess
Acarbon (II) oxide
Bcarbon (IV) oxide
Chydrogen sulphide
Dnitrogen (II) oxide
Eoxygen
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Question 12
neco 2009
Which of the following is a solid at room temperature?
AArgon
BBromine
CChlorine
DFluorine
EIodine
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Question 13
neco 2009
The relationship between equilibrium constant and free energy change is represented as
Aδ G ° =-nFE °
BδG °-RT ln K
Cδ G °= + RT In k
DδG ° = δH – T S
EH=TδS
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Question 14
neco 2009
Which of the following salt solutions will have a pH greater than 7?
ANaCl
BNaHSO4
CNa2CO4
DNa2SO4
EMgCl2
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Question 15
neco 2009
Non-polar molecules are held together by
Aco-ordinate bond
Bcovalent bond
Celectromagnetic force
Dhydrogen bond
EVan der Waals forces
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Question 16
neco 2009

The Ideal Gas Law is expressed mathematically as

AP1 /T1 = P2/T2
BP1/V1 = P2V2
CPV =nRT
DPV =KT
EV1/T1 = V2/T2
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Question 17
neco 2009
Two elements X and Y with electronic configurations 2,8,2 and 2,8,7 respectively, are likely to combine by _________bonding
Acovalent
Bdative
Celectrovalent
Dhydrogen
Emetallic
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Question 18
neco 2009

The furring of kettles and boilers are caused by

Acalcium hydroxide
Bcalcium hydrogen trioxocarbonate (IV)
Ccalcium trioxocarbonate (IV)
Dcalcium tetraoxocarbonate
Emagnesium tetraoxocarbonate (VI)
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Question 19
neco 2009
Which of the following metals is NOT extracted by electrolysis?
AAluminium
BCalcium
Ciron
DMagnesium
ESodium
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Question 20
neco 2009

What mass of copper in gram would be deposited by a current of 1.00ampere passing for 965 seconds through copper(II) tertraoxosulphate (VI) solution? [Cu 63.5; If = 96500c]

A0.32
B0.64
C3.18
D6.35
E9.65
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