POST UTME UI 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 20.0 mL sample of 0.500 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 20.0 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 2
In a titration experiment, 25.0 cm³ of 0.100 M NaOH is required to neutralize 20.0 cm³ of a weak acid. Calculate the concentration of the acid.
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 3
A 2.00 g sample of a subs\tance is placed in a 100.0 mL flask and heated to 100°C. If the pressure of the gas is 1.00 atm, what is the volume of the flask in liters?
A. 0.100 L
B. 0.200 L
C. 0.500 L
D. 1.00 L
Question 4
A 10.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 10.0 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 5
A 0.1 M solution of sodium hydroxide (NaOH) is prepared by dissolving 0.1 mol of NaOH in 1 L of water. Calculate the pH of the solution.
A. 1
B. 2
C. 3
D. 4
Question 6
A polymer is a large molecule composed of many repeated subunits called monomers. Which of the following is a characteristic of polymers?
A. They are typically found in nature.
B. They have a high melting point.
C. They are composed of many repeating subunits called monomers.
D. They are typically soluble in water.
Question 7
A 1.0 M solution of NaOH is titrated with a 1.0 M solution of HCl. If 20 mL of HCl is added to 80 mL of NaOH, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 8
The pH of a 0.1 M solution of a weak acid HA is 4.5. If 10 mL of 1 M NaOH is added to 90 mL of the acid solution, what is the pH of the resulting solution?
A. 3.5
B. 4.5
C. 5.5
D. 6.5
Question 9
In the electrolysis of a solution of copper(II) sulfate, the anode is made of platinum and the cathode is made of copper. What is the primary function of the anode in this electrolysis?
A. To reduce copper(II) ions to copper metal
B. To oxidize copper metal to copper(II) ions
C. To facilitate the flow of electrons from the anode to the cathode
D. To prevent the deposition of copper metal on the anode
Question 10
A solution of 0.100 M HCl is titrated with 0.100 M NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the number of moles of HCl present?
A. 0.00250 mol
B. 0.00500 mol
C. 0.00750 mol
D. 0.0125 mol
Question 11
The rate of reaction between hydrogen peroxide and iodide ions is increased by the presence of a(n) _______________________.
A. catalyst
B. inhibitor
C. substrate
D. product
Question 12
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 13
A 5.00 g sample of a metal carbonate is heated to produce a metal oxide and CO₂ gas. If 20.0 cm³ of CO₂ is collected at STP, calculate the molar mass of the metal.
A. 20.0 g/mol
B. 40.0 g/mol
C. 60.0 g/mol
D. 80.0 g/mol
Question 14
A 15.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 15.0 mL of NaOH?
A. 1
B. 2
C. 3
D. 4
Question 15
A 2.00 g sample of a subs\tance is placed in a 100.0 mL flask and heated to 100°C. If the pressure of the gas is 1.00 atm, what is the number of moles of the gas present?
A. 0.0500 mol
B. 0.100 mol
C. 0.200 mol
D. 0.500 mol

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