POST UTME ESUT 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
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 3
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 4
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
Question 5
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 6
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 7
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 8
A solution contains 0.5 M NaCl and 0.2 M CaCl2. What is the total concentration of chloride ions in the solution?
A. 0.7 M
B. 0.8 M
C. 0.9 M
D. 1.0 M
Question 9
A diagram of a titration setup is shown below. If 25 mL of 0.1 M NaOH is added to 25 mL of 0.1 M HCl, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 10
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 11
The rate cons\tant (k) of a first-order reaction is related to the half-life \( t_\( 1/2 \ \)) by the equation: k = ln(2) / t_\( 1/2 \). If the half-life of a reaction is 10 minutes, what is the rate cons\tant (k)?
A. 0.0693 min^\( -1 \)
B. 0.693 min^\( -1 \)
C. 6.93 min^\( -1 \)
D. 69.3 min^\( -1 \)
Question 12
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 13
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 14
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 15
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

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: