POST UTME IMS U 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 L flask contains 0.25 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 × 10^5 Pa
B. 2.01 × 10^5 Pa
C. 3.01 × 10^5 Pa
D. 4.01 × 10^5 Pa
Question 2
Determine the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C. The dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 3
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the concentration of H+ ions in the resulting solution?
A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.001 M
Question 4
A solution contains 0.1 M NaCl and 0.1 M CaCl2. What is the concentration of Cl- ions in the solution?
A. 0.2 M
B. 0.1 M
C. 0.05 M
D. 0.01 M
Question 5
The reaction of nitrogen dioxide with water produces nitric acid and nitric oxide. Write the balanced chemical equation for this reaction, including the states of all reac\tants and products.
A. \text{NO}_2(g) + \text{H}_2\text{O}(l) \rightarrow \text{HNO}_3(aq) + \text{NO}(g)
B. \text{NO}_2(g) + \text{H}_2\text{O}(l) \rightarrow \text{HNO}_3(aq) + \text{NO}_2(g)
C. \text{NO}_2(g) + \text{H}_2\text{O}(l) \rightarrow \text{HNO}_3(aq) + \text{O}_2(g)
D. \text{NO}_2(g) + \text{H}_2\text{O}(l) \rightarrow \text{HNO}_3(aq) + \text{H}_2(g)
Question 6
Determine the s\tandard electrode potential of the reaction: MnO4- + 8H+ + 5e- → Mn2+ + 4H2O. Given that the s\tandard electrode potential of the O2/O2 couple is 1.23 V.
A. -1.51 V
B. -1.23 V
C. -1.51 V
D. +1.23 V
Question 7
The atomic radius of an element is 100 pm. Calculate the volume of the element's atom u\sing the formula V = \( 4/3 \)πr^3.
A. 4.19 × 10^-29 m^3
B. 4.19 × 10^-28 m^3
C. 4.19 × 10^-27 m^3
D. 4.19 × 10^-26 m^3
Question 8
A 2.5 g sample of an unknown hydrocarbon is burned in a combustion calorimeter. The volume of oxygen consumed is 11.2 L at 25°C and 1 atm. The volume of carbon dioxide produced is 8.4 L at the same conditions. Calculate the empirical formula of the hydrocarbon.
A. C2H6
B. C3H8
C. C4H10
D. C5H12
Question 9
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 10
A 2.5 M solution of hydrochloric acid (HCl) is titrated with a 1.0 M solution of sodium hydroxide (NaOH). What is the pH of the resulting solution after 25 mL of NaOH has been added?
A. 3
B. 7
C. 10
D. 14
Question 11
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. What is the concentration of H+ ions in the resulting solution?
A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.001 M
Question 12
A 1.00 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. Calculate the partial pressure of the gas.
A. 0.900 atm
B. 0.950 atm
C. 1.00 atm
D. 1.05 atm
Question 13
Determine the number of moles of ΔH2O produced when 2.50 g of glu\cose (C6H12O6) is completely oxidized in a combustion reaction.
A. 0.0500 mol
B. 0.100 mol
C. 0.150 mol
D. 0.200 mol
Question 14
The reaction of sodium hydroxide with hydrochloric acid produces sodium chloride and water. Write the balanced chemical equation for this reaction, including the states of all reac\tants and products.
A. \text{NaOH}(aq) + \text{HCl}(aq) \rightarrow \text{NaCl}(aq) + \text{H}_2\text{O}(l)
B. \text{NaOH}(aq) + \text{HCl}(aq) \rightarrow \text{NaCl}(l) + \text{H}_2\text{O}(g)
C. \text{NaOH}(aq) + \text{HCl}(aq) \rightarrow \text{NaCl}(aq) + \text{H}_2\text{O}(g)
D. \text{NaOH}(l) + \text{HCl}(aq) \rightarrow \text{NaCl}(aq) + \text{H}_2\text{O}(l)
Question 15
The diagram below shows a circuit setup. Identify the part labeled A.
A. Resistor
B. Capacitor
C. Inductor
D. Battery

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