POST UTME NOUN 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 repeating unit?
A. 200 g/mol
B. 400 g/mol
C. 600 g/mol
D. 800 g/mol
Question 2
A 2 M solution of a weak acid is titrated with 2 M NaOH. If 10 mL of the acid is required to reach the equivalence point, what is the pH of the solution at the equivalence point?
A. 7
B. 9
C. 11
D. 13
Question 3
A solution contains 2.50 g of sodium chloride (NaCl) dissolved in 100.0 mL of water. What is the molarity of the solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 4
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 measure the concentration of the solution
C. To mix the solution with the analyte
D. To separate the solution from the analyte
Question 5
A sample of a polymer is analyzed by size exclusion chromatography (SEC). The chromatogram shows a \single peak with a retention time of 15 minutes. What is the molecular weight of the polymer?
A. 5000 g/mol
B. 10000 g/mol
C. 15000 g/mol
D. 20000 g/mol
Question 6
A 1 M solution of a salt is analyzed by ion chromatography (IC). The chromatogram shows two peaks with retention times of 5 minutes and 10 minutes. What is the molar ratio of the two ions?
A. 1:1
B. 2:1
C. 1:2
D. 3:1
Question 7
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 25 mL of HCl has been added to 25 mL of NaOH?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 8
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 50 mL of HCl has been added to 50 mL of NaOH?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 9
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. 737 mmHg
C. 714 mmHg
D. 691 mmHg
Question 10
A solution of sulfuric acid is prepared by dissolving 25 g of sulfuric acid in 100 mL of water. What is the concentration of the solution in terms of molarity?
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 5.0 M
Question 11
The reaction between sulfuric acid and sodium hydroxide is a classic example of a double displacement reaction. What is the chemical equation for this reaction?
A. \text{H}_2\text{SO}_4 + 2\text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O}
B. \text{H}_2\text{SO}_4 + \text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + \text{H}_2\text{O}
C. \text{H}_2\text{SO}_4 + 2\text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + \text{H}_2\text{O}
D. \text{H}_2\text{SO}_4 + \text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O}
Question 12
A gas at s\tandard temperature and pressure (STP) has a volume of 22.4 L. What is the number of moles of the gas?
A. 1.00 mol
B. 2.00 mol
C. 3.00 mol
D. 4.00 mol
Question 13
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^\( -10 \) s^\( -1 \)
B. 1.0 x 10^\( -9 \) s^\( -1 \)
C. 1.0 x 10^\( -8 \) s^\( -1 \)
D. 1.0 x 10^\( -7 \) s^\( -1 \)
Question 14
Determine the number of moles of oxygen gas (O2) required to completely combust 2.50 moles of propane (C3H8) according to the balanced equation: C3H8 + 5O2 → 3CO2 + 4H2O.
A. 1.25 moles
B. 2.50 moles
C. 3.75 moles
D. 5.00 moles
Question 15
A solution contains 10.0 g of glu\cose (C6H12O6) dissolved in 100.0 mL of water. What is the concentration of the solution in grams per liter?
A. 10.0 g/L
B. 20.0 g/L
C. 30.0 g/L
D. 40.0 g/L

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