POST UTME ESUT 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a titration apparatus is shown below. What is the purpose of the burette in the apparatus?
A. To measure the volume of the titrant.
B. To measure the volume of the analyte.
C. To mix the titrant and analyte.
D. To filter the solution.
Question 2
The reaction 2A + B → C + 2D is a second-order reaction with respect to A and first-order with respect to B. If the rate cons\tant (k) is 0.05 M^\( -1 \)s^\( -1 \) and the initial concentrations of A and B are 0.1 M and 0.05 M, respectively, what is the rate of reaction after 10 minutes?
A. 0.001 M/s
B. 0.01 M/s
C. 0.1 M/s
D. 1 M/s
Question 3
A sample of an ideal gas is heated at cons\tant volume. Which of the following statements is true about the change in entropy of the gas?
A. The entropy of the gas increases.
B. The entropy of the gas decreases.
C. The entropy of the gas remains cons\tant.
D. The entropy of the gas becomes undefined.
Question 4
A 0.1 M solution of CuSO4 is mixed with a 0.1 M solution of NaOH. If the reaction is allowed to proceed to equilibrium, what is the concentration of Cu(OH)2?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 5
A sample of a subs\tance has a mass of 25 g and a volume of 10 mL. What is the density of the subs\tance?
A. 2.5 g/mL
B. 2.0 g/mL
C. 1.5 g/mL
D. 1.0 g/mL
Question 6
A metal has a density of 8 g/cm^3. If a 2 cm^3 sample of the metal weighs 16 g, what is the volume of a 100 g sample of the metal?
A. 10
B. 20
C. 30
D. 40
Question 7
A solution contains 10 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1
B. 1
C. 10
D. 100
Question 8
A diagram of a simple harmonic motion is shown below. What is the amplitude of the motion?
A. 2 cm
B. 3 cm
C. 4 cm
D. 5 cm
Question 9
A polymer has a molecular weight of 100,000 g/mol. If 1 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 0.1
B. 1
C. 10
D. 100
Question 10
A diagram of a cell is shown below. If the cell potential is 1.23 V and the current is 0.5 A, what is the number of moles of electrons transferred?
A. 0.25 mol
B. 0.5 mol
C. 1 mol
D. 1.25 mol
Question 11
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 12
A 0.1 M solution of Fe2+ ions is mixed with a 0.1 M solution of SCN- ions. If the reaction is allowed to proceed to equilibrium, what is the concentration of FeSCN2+ ions?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 13
A 25 mL sample of 0.5 M NaOH is titrated with 0.5 M HCl. What is the pH of the solution after the addition of 25 mL of HCl?
A. 1
B. 2
C. 3
D. 4
Question 14
A sample of a gas at 25°C and 1 atm is compressed to 2 atm. What is the new volume of the gas, assuming ideal behavior?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 15
Determine the number of moles of electrons transferred during the electrolysis of 2.5 L of water at 25°C, where the cell potential is 1.23 V and the current is 0.5 A.
A. 0.25 mol
B. 0.5 mol
C. 1 mol
D. 1.25 mol

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