POST UTME RSU 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Determine the molar solubility of AgCl in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) for AgCl is 1.8 × 10^\( -10 \) and the solubility product cons\tant (Ksp) for NaCl is 3.2 × 10^\( -9 \).
A. 1.0 × 10^\( -5 \) M
B. 1.5 × 10^\( -5 \) M
C. 2.0 × 10^\( -5 \) M
D. 2.5 × 10^\( -5 \) M
Question 2
A 0.1 M solution of HCl is titrated with a 0.1 M solution of NaOH. If 25 mL of NaOH is required to reach the equivalence point, determine the number of moles of HCl present in 100 mL of the initial HCl solution.
A. 0.005 mol
B. 0.01 mol
C. 0.015 mol
D. 0.02 mol
Question 3
The reaction 2NO(g) + O2(g) → 2NO2(g) has an equilibrium cons\tant Kp = 1.5 × 10^\( -3 \) at 298 K. If the partial pressure of NO is 0.05 atm, calculate the partial pressure of NO2.
A. 0.001 atm
B. 0.005 atm
C. 0.01 atm
D. 0.015 atm
Question 4
A 2.50 L sample of a gas at 27°C and 1.00 atm is compressed to 0.500 L at 37°C. What is the new pressure?
A. 2.00 atm
B. 3.00 atm
C. 4.00 atm
D. 5.00 atm
Question 5
A 2.00 L sample of a gas at 27°C and 1.00 atm is compressed to 0.500 L at 37°C. What is the new pressure?
A. 2.00 atm
B. 3.00 atm
C. 4.00 atm
D. 5.00 atm
Question 6
A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. If 25 mL of the acid is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point for a 50 mL sample of the acid?
A. 10 mL
B. 25 mL
C. 50 mL
D. 75 mL
Question 7
A sample of nitrogen gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of nitrogen gas?
A. 760 mmHg
B. 736.2 mmHg
C. 712.4 mmHg
D. 688.6 mmHg
Question 8
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after 25 mL of 0.1 M HCl is added to 50 mL of 0.1 M NaOH?
A. 4
B. 7
C. 10
D. 12
Question 9
A solution contains 25.0 g of NaCl in 250.0 mL of water. What is the molarity of the solution?
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 10
Determine the empirical formula of a compound containing 40.0 g of carbon, 6.0 g of hydrogen, and 54.0 g of oxygen, assuming a 100.0 g sample.
A. CH2O
B. C2H4O2
C. C3H6O
D. C4H8O2
Question 11
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the pH of the resulting solution?
A. 9
B. 10
C. 11
D. 12
Question 12
A 0.1 M solution of a salt is prepared by mixing 0.1 M HCl and 0.1 M NaOH. What is the concentration of the salt in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 13
A 2.0-g sample of a non-metallic oxide is heated in a stream of hydrogen gas, producing 1.2 L of water vapor at 25°C and 1 atm. If the molar volume of an ideal gas is 22.4 L/mol, determine the molar mass of the oxide.
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol
Question 14
A sample of air contains 20% O2, 70% N2, and 10% CO2 by volume. If the total pressure is 1 atm, what is the partial pressure of CO2?
A. 0.01 atm
B. 0.02 atm
C. 0.03 atm
D. 0.04 atm
Question 15
A 0.1 M solution of a salt is prepared by mixing 0.1 M HCl and 0.1 M NaOH. What is the concentration of the acid in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M

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