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Thursday, 02 April 2026
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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 21:
The entropy and enthalpy of a system are a measure of
  • A Degree of disorderlinesss and heat content respectively
  • B Heat content and degree of disorderliness respectively
  • C Heat content of a system only
  • D Degree of disorderliness only
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Question 22:
2SO2(g) + O2(g) ↔ 2SO3(g). In the chemical reaction above, the substance that will increase the rate of production of sulphur (VI) oxide is
  • A Manganese (IV) oxide
  • B Finely divided iron
  • C Vanadium (V) oxide
  • D Nickel
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Question 23:
N2O4(g) ↔ 2NO2(g). Increase in total pressure of the equilibrium reaction above will
  • A Produce more of NO2(g) in the mixture
  • B Convert all of N2O4(g) to NO2(g)
  • C Have no effect on the concentrations of NO2(g)and N2O4(g)
  • D Produce more of N2O4(g) in the mixture
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Question 24:
What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?
[ F = 96 5000 C mol-1 ]
  • A 24 125 coulombs
  • B 48 250 coulombs
  • C 72 375 coulombs
  • D 96 500 coulombs
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Question 25:
X + Y → Z. The rate equation for the chemical reaction above is ((-Δ[x])/Δt) = K[X]2[Y].
The overall order of the reaction is
  • A 0.0
  • B 1.0
  • C 2.0
  • D 3.09
View Answer & Explanation