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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.

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

47 questions
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Question 1 of 20 47 total questions
Question 11
jamb 2011
Given that M is the mass of a substance deposited during electrolysis and Q is the quantity of electricity consumed, then Faraday's first law can be written as
[Electrochemical equivalent]
AM = E/Q
BM = EQ
CM = Q/E
DM = E/2Q
View Explanation & Discuss
Question 12
jamb 2011
MnO-4(aq) + Y + 5Fe2+(aq) → Mn2+(aq) + 5Fe2+(aq) + 4H2O(l)
In the equation above, Y is
A5H+(aq)
B4H+(aq)
C10H+(aq)
D8H+(aq)
View Explanation & Discuss
Question 13
jamb 2011
The diagram above best illustrates the effect of decrease in
Aconcentration
Btemperature
Csurface area
Dpressure
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Question 14
jamb 2011
The condition required for corrosion to take place is the presence of
Awater and carbon (IV) oxide
Bwater, carbon (IV) oxide and oxygen
Coxygen and carbon (IV) oxide
Dwater and oxygen
View Explanation & Discuss
Question 15
jamb 2011
CH4(g) + Cl2(g) → CH3 Cl(s) + HCl(g)
The major factor that influence the rate of the reaction above is
Acatalyst
Btemperature
Cconcentration
Dlight
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Question 16
jamb 2011

The function of zinc electrode in a galvanic cells is that it

Aundergoes reduction
Bserves as the positive electrode
Cproduction of electons
Duses up electrons
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Question 17
jamb 2011

A chemical reaction which the hydration energy is greater than the lattice energy is referred to as

Aa spontaneous reaction
Ban endothermic reaction
Can exothermic reaction
Da reversible reaction
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Question 18
jamb 2011

Which of the following is a deliquescent compound?

ANaNO3
BCaCl2
CCuO
DNa2CO3.10H2O
View Explanation & Discuss
Question 19
jamb 2011

An effect of thermal pollution on water bodies is that the

Avolume of water reduces
Bvolume of chemical waste increase
Clevel of oxides of nitrogen increase
Dlevel of oxygen reduces
View Explanation & Discuss
Question 20
jamb 2011

Which of the following is NOT an alkali?

ANH3
BMg(OH)2
CCa(OH)2
DNaOH
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Question 21
jamb 2011
How many cations will be produced from a solution of potassium aluminium tetraoxosulphate (VI)?
A3
B4
C1
D2
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Question 22
jamb 2011
CH3COOH(aq) + OH-(aq) ↔ CH3COO-(aq) + H2O(l)
In the reaction above ,CH3COO-(aq) is
Aconjugate base
Bacid
Cbase
Dconjugate acid
View Explanation & Discuss
Question 23
jamb 2011
N2O4(g) ↔ 2NO2(g) ΔH = +ve
In the reaction above, an increase in temperature will
Aincrease the value of the equilibrium constant
Bdecreases the value of the equilibrium constant
Cincrease in the reactant production
Dshift the equilibrium to the left
View Explanation & Discuss
Question 24
jamb 2011

Which of the following noble gases is commonly found in the atmosphere?

AXenon
BNeon
CHelium
DArgon
View Explanation & Discuss
Question 25
jamb 2011

A suitable solvent for iodine and naphthalene is

Acarbon (IV) sulphide
Bethanol
Cwater
Dbenzene
View Explanation & Discuss
Question 26
jamb 2011

Hardness of water is mainly due to the presence of

Acalcium hydroxide or magnesium hydroxide
Bcalcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI)
Csodium hydroxide or magnesium hydroxide
Dcalcium chloride or sodium chloride salts
View Explanation & Discuss
Question 27
jamb 2011
What type of bond exits between an element X with atomic number 12 and Y with atomic number 17?
AElectrovalent
BMetallic
CCovalent
DDative
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Question 28
jamb 2011
The importance of sodium aluminate (III) in the treatment of water is to
Acause coagulation
Bneutralize acidity
Cprevent goitre and tooth decay
Dkill germs
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Question 29
jamb 2011

From the diagram above, find the amount of solute deposited when 200 cm\(^3\) of the solution is cooled from 55°C to 40°C.

A0.10 mole
B0.20mole
C0.01 mole
D0.02 mole
View Explanation & Discuss
Question 30
jamb 2011
The arrangement of particles in crystal lattices can be studied using
AX - rays
Bγ - rays
Cα - rays
Dβ - rays
View Explanation & Discuss
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