POST UTME PAN-ATLANTIC UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A metal M has a density of 8.5 g/cm3 and a molar mass of 120 g/mol. If a 2.5 g sample of the metal is dissolved in acid, what is the volume of the solution in cm3?
A. 0.30 cm3
B. 0.50 cm3
C. 0.70 cm3
D. 1.00 cm3
Question 2
Determine the molar solubility of AgCl in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) of AgCl is 1.8 × 10^\( -10 \) and the solubility product cons\tant (Ksp) of NaCl is 3.2 × 10^\( -9 \).
A. 1.0 × 10^\( -5 \) M
B. 2.0 × 10^\( -5 \) M
C. 3.0 × 10^\( -5 \) M
D. 4.0 × 10^\( -5 \) M
Question 3
The s\tandard Gibbs free energy change (ΔG°) for the reaction 2NO(g) + O2(g) → 2NO2(g) at 298 K and 1 atm is -111.3 kJ/mol. Calculate the equilibrium cons\tant (K) for this reaction.
A. 1.00 × 10^5
B. 1.00 × 10^3
C. 1.00 × 10^2
D. 1.00 × 10^1
Question 4
A solution of sodium hydroxide is titrated with a solution of hydrochloric acid. What is the pH of the solution after the titration is complete?
A. 7
B. 9
C. 11
D. 13
Question 5
A 0.100 M solution of NaOH is mixed with 0.100 M solution of HCl. If the reaction is allowed to go to completion, what is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
A solution of 0.10 M NaCl is electrolyzed u\sing a platinum electrode. If the current is 2.5 A, and the electrolysis is carried out for 10 minutes, what is the mass of Cl2 gas collected at the anode?
A. 0.25 g
B. 0.50 g
C. 1.00 g
D. 2.00 g
Question 7
A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?
A. To measure the volume of the solution
B. To mix the solution with the analyte
C. To add the analyte to the solution
D. To measure the pH of the solution
Question 8
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the monomer?
A. 200 g/mol
B. 500 g/mol
C. 1000 g/mol
D. 2000 g/mol
Question 9
A 10% solution of HCl is mixed with a 20% solution of NaOH. Calculate the concentration of the resulting solution.
A. 15%
B. 18%
C. 20%
D. 22%
Question 10
A 2.5 g sample of a non-metallic oxide is found to contain 0.625 g of oxygen. What is the empirical formula of the oxide?
A. O2S
B. SO2
C. SO3
D. S2O3
Question 11
At 273 K, the root mean square speed of a gas is 200 m/s. What is the root mean square speed of the gas at 373 K?
A. 300 m/s
B. 400 m/s
C. 500 m/s
D. 600 m/s
Question 12
A 0.500 M solution of NaOH is titrated with 0.500 M HCl. What is the pH of the solution after the reaction is complete?
A. 7.00
B. 7.50
C. 8.00
D. 9.00
Question 13
A 0.100 M solution of NaOH is mixed with 0.100 M solution of HCl. If the reaction is allowed to go to completion, what is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 14
A 0.5 M solution of HCl is prepared by dissolving 50 g of HCl in 100 mL of water. What is the concentration of HCl in the solution, expressed in g/L?
A. 0.25 g/L
B. 0.50 g/L
C. 0.75 g/L
D. 1.00 g/L
Question 15
A 2.0 L flask contains 0.5 mol of CO2 at 25°C. What is the partial pressure of CO2 in the flask?
A. 0.25 atm
B. 0.50 atm
C. 0.75 atm
D. 1.00 atm

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