POST UTME IGBINEDION UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of sulfur (S8) is heated in a stream of oxygen gas (O2) to produce sulfur dioxide (SO2). If 2.0 moles of sulfur (S8) are heated, what is the limiting reac\tant?
A. S8
B. O2
C. SO2
D. Neither S8 nor O2 is the limiting reac\tant
Question 2
A reaction is carried out at cons\tant pressure and temperature. If the volume of the system increases by 20% and the number of moles of gas increases by 10%, what is the change in entropy?
A. ΔS = 10 J/K
B. ΔS = 20 J/K
C. ΔS = 30 J/K
D. ΔS = 40 J/K
Question 3
A solution contains 0.50 M NaCl. What is the concentration of chloride ions \( Cl- \) in the solution?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.0 M
Question 4
The reaction 2NO(g) + O2(g) → 2NO2(g) has a rate cons\tant (k) of 0.05 s^-1. If the initial concentrations of NO and O2 are 0.1 M and 0.2 M, respectively, what is the rate of reaction after 10 seconds?
A. 0.001 M s^-1
B. 0.01 M s^-1
C. 0.05 M s^-1
D. 0.1 M s^-1
Question 5
A solution of H2SO4 is 0.500 M. If 25.0 mL of this solution is diluted to 100.0 mL, what is the new concentration?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 6
A 10.0 L flask contains 0.10 M HCl. What is the number of moles of HCl in the flask?
A. 0.10 mol
B. 0.20 mol
C. 0.30 mol
D. 0.40 mol
Question 7
The half-life of a radioactive subs\tance is 5.0 years. If 100.0 g of the subs\tance is initially present, what is the mass of the subs\tance remaining after 10.0 years?
A. 12.5 g
B. 25.0 g
C. 50.0 g
D. 100.0 g
Question 8
The compound with the molecular formula C6H12O6 is a derivative of which of the following sugars?
A. glu\cose
B. fructose
C. sucrose
D. lactose
Question 9
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). If 25.0 g of zinc metal is reacted with 50.0 mL of 0.100 M copper(II) sulfate solution, what is the limiting reac\tant?
A. Zinc metal
B. Copper(II) sulfate solution
C. Neither zinc metal nor copper(II) sulfate solution is the limiting reac\tant
D. Both zinc metal and copper(II) sulfate solution are the limiting reac\tants
Question 10
A sample of CO2 is collected over water and has a volume of 2.50 L at 25.0°C and 1.00 atm. What is the partial pressure of CO2?
A. 0.500 atm
B. 0.750 atm
C. 1.00 atm
D. 1.25 atm
Question 11
A 2.0 L flask contains 0.50 M H2SO4. What is the number of moles of H2SO4 in the flask?
A. 0.25 mol
B. 0.50 mol
C. 0.75 mol
D. 1.0 mol
Question 12
The rate cons\tant (k) of a first-order reaction is given by the equation: k = Ae^\( -Ea/RT \). If the activation energy (Ea) is 100 kJ/mol, the gas cons\tant (R) is 8.314 J/\( mol*K \), and the temperature (T) is 300 K, what is the value of the rate cons\tant (k) if the pre-exponential factor (A) is 1.0 x 10^10 s^\( -1 \)?
A. 1.0 x 10^\( -4 \) s^\( -1 \)
B. 1.0 x 10^\( -3 \) s^\( -1 \)
C. 1.0 x 10^\( -2 \) s^\( -1 \)
D. 1.0 x 10^\( -1 \) s^\( -1 \)
Question 13
A 2.0 L flask contains 0.50 M H2SO4. What is the concentration of hydrogen ions \( H+ \) in the solution?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.0 M
Question 14
A 50 mL sample of 0.1 M H2SO4 is titrated with 0.1 M NaOH. What is the pH of the solution after the addition of 20 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 15
The rate cons\tant (k) for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
A. 0.005 M
B. 0.01 M
C. 0.05 M
D. 0.1 M

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