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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.

4,306 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

4,306 questions
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Question 1 of 20 4,306 total questions
Question 901
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
View Explanation & Discuss
Question 902
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 903
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 904
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 905
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 906
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 907
neco 2009
All the following belong to the same family EXCEPT
Aglycerol
Bnylon
Cperspex polyethene
Dpolyethene
Epolystyrene
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Question 908
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 909
neco 2009

The following are ores of metals EXCEPT

Abauxite
Bdolomite
Cgraphite
Dhaematite
Emagnetite
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Question 910
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 911
neco 2009
Which of the following is a solid at room temperature?
AArgon
BBromine
CChlorine
DFluorine
EIodine
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Question 912
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 913
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 914
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 915
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 916
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 917
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 918
neco 2009
Which of the following metals is NOT extracted by electrolysis?
AAluminium
BCalcium
Ciron
DMagnesium
ESodium
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Question 919
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
View Explanation & Discuss
Question 920
neco 2009

How many zones are present in a luminous Bunsen burner flame?

A2
B3
C4
D5
E6
View Explanation & Discuss
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