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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 7 47 total questions
Question 21
jamb 1986

What is the consequences of increasing pressure on the equilibrium reaction ZnO(s) + H2(g) Zn(s) + H2O(I)?

AThe equilibrium is driven to the left
BThe equilibrium is driven to the right
CThere is no effect
DMore ZnO is produced
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Question 22
jamb 1986
20 cm3 of 1.0 molar NH4OH solution when neutralized with 20.05cm3 of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH4OH?
A-51.O KJ mol-
B+57.3 KJ mol-
C+57.O KJ mol-
D+51.0 KJ mol-
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Question 23
jamb 1986
Which of these represents a redox reaction?
AAgNO3 + NaCl → AgCAl + NaNO3
BH2S + Pb(NO3) → PbS + 2HNO3
CCaCO3 → CaO + CO2
DZn + 2HCl → ZnCl2 + H2
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Question 24
jamb 1986

How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?

A3.90 x 102 coulombs
B5.50 x 103 coulombs
C6.54 x 103 coulombs
D2.34 x 104 coulombs
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Question 25
jamb 1986
Which of the following solutions will conduct the least amount of electricity?
A2.00 M aqueous solution of NaOH
B0.01 M aqueous solution of NaOH
C0.01 M aqueous solution of hexanoic acid
D0.01 M aqueous solution of sugar
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Question 26
jamb 1986

Which of the following is an acidic salt?

ANaHSO4
BNa2SO4
CCH3CO2Na
DNa2S
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Question 27
jamb 1986
Which of the following salts when dissolved in water will NOT give the corresponding pH value?
ANaHSO4, pH < 5
BNa2CO3, pH > 8
CNa2Cl,pH = 7
DNaHCO
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