POST UTME ESUT 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of 0.01 M HCl is prepared by dissolving 0.01 mol of HCl in 1 L of water. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 2
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.0 mol of C6H12O6(s) at 298 K.
A. \( Delta H = - 2800 , \text{kJ} \)
B. \( Delta H = - 3000 , \text{kJ} \)
C. \( Delta H = - 3200 , \text{kJ} \)
D. \( Delta H = - 3400 , \text{kJ} \)
Question 3
A 2.50 L sample of a gas at 298 K and 1.00 atm is collected over water. If the vapor pressure of water at 298 K is 0.0313 atm, calculate the partial pressure of the gas.
A. 0.968 atm
B. 0.974 atm
C. 0.980 atm
D. 0.986 atm
Question 4
A solution contains 0.1 M NaCl and 0.1 M NaOH. What is the pH of the solution?
A. 7
B. 8
C. 9
D. 10
Question 5
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If the initial pH of the acid is 4.5, what is the pH of the solution after the addition of 10 mL of NaOH?
A. 5.5
B. 6.5
C. 7.5
D. 8.5
Question 6
The diagram below shows a cell with a salt bridge.
A. The cell is a galvanic cell.
B. The cell is an electrolytic cell.
C. The salt bridge is used to connect the two half-cells.
D. The salt bridge is used to separate the two half-cells.
Question 7
A 1 L solution contains 0.1 M HCl and 0.1 M NaOH. What is the concentration of the solution in g/L?
A. 0.1 g/L
B. 1 g/L
C. 10 g/L
D. 100 g/L
Question 8
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 15.0 mL of NaOH.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 9
Determine the molar mass of a polymer with the following composition: 60% polyethylene (C2H4)n, 20% polypropylene (C3H6)n, and 20% polyvinyl chloride (C2H3Cl)n. Given that the molar mass of polyethylene is 14.0 g/mol, polypropylene is 42.1 g/mol, and polyvinyl chloride is 62.5 g/mol.
A. 120.0 g/mol
B. 150.0 g/mol
C. 180.0 g/mol
D. 200.0 g/mol
Question 10
A solution containing 0.50 M NaOH is mixed with a solution containing 0.25 M HCl. What is the concentration of the resulting solution?
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.00 M
Question 11
A 2.0 L flask contains 0.5 mol of an ideal gas at 298 K. Calculate the entropy change (ΔS) when the gas expands isothermally to a final volume of 5.0 L.
A. \( Delta S = 1.5 , \text{J/K} \)
B. \( Delta S = 3.0 , \text{J/K} \)
C. \( Delta S = 4.5 , \text{J/K} \)
D. \( Delta S = 6.0 , \text{J/K} \)
Question 12
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 13
A sample of a non-metallic oxide (M2O3) has a mass of 2.5 g and a volume of 1 L. What is the density of the oxide?
A. 2.5 g/L
B. 5.0 g/L
C. 10.0 g/L
D. 20.0 g/L
Question 14
A 2.5 L sample of a gas at 25°C and 1 atm is compressed to 1 L at cons\tant temperature. Calculate the final pressure of the gas.
A. 4.0 atm
B. 5.0 atm
C. 6.0 atm
D. 7.0 atm
Question 15
A diagram of a plant cell is shown below. Identify the organelle responsible for protein synthesis.
A. mitochondria
B. nucleus
C. ribosomes
D. lysosomes

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