POST UTME CALEB UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction of nitrogen dioxide with water is represented by the equation: 3NO2 + H2O → 2HNO3 + NO. What is the oxidation state of nitrogen in the product HNO3?
A. +3
B. +5
C. +7
D. +9
Question 2
A 2.5 g sample of a subs\tance is dissolved in 100 mL of water. If the molarity of the solution is 0.5 M, what is the molar mass of the subs\tance?
A. 200
B. 300
C. 400
D. 500
Question 3
A 2.0 M solution of HCl is titrated with 1.0 M NaOH. If 20 mL of NaOH is added, what is the pH of the solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 4
A 2.5 L flask contains 0.5 mol of an ideal gas at a temperature of 298 K. What is the pressure of the gas in the flask?
A. 101.3 kPa
B. 102.5 kPa
C. 103.8 kPa
D. 105.1 kPa
Question 5
A 2.5 M solution of sodium hydroxide is prepared by dissolving 12.5 g of NaOH in water to make 1 L of solution. What is the pH of the solution?
A. 12
B. 13
C. 14
D. 15
Question 6
A 3.0 g sample of a subs\tance is dissolved in 200 mL of water. If the molarity of the solution is 0.2 M, what is the molar mass of the subs\tance?
A. 300
B. 400
C. 600
D. 750
Question 7
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the pH of the solution after 10.0 mL of HCl has been added.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 8
A certain metal M has a s\tandard electrode potential of +0.5 V. If a cell is constructed with M as the anode and a s\tandard hydrogen electrode as the cathode, what is the s\tandard cell potential of the cell?
A. 0.5 V
B. -0.5 V
C. +1.0 V
D. -1.0 V
Question 9
A 2.50 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The mass of the metal oxide is 1.75 g. Calculate the percentage yield of the metal oxide.
A. 70.0%
B. 80.0%
C. 90.0%
D. 95.0%
Question 10
A 1.0 M solution of NaOH is titrated with 1.0 M HCl. If 20 mL of HCl is added, what is the pH of the solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 11
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 12
A diagram of a titration setup is shown below. If 25 mL of 0.1 M HCl is required to reach the equivalence point, what is the concentration of the NaOH solution?
A. 0.1 M
B. 0.05 M
C. 0.01 M
D. 0.005 M
Question 13
A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.02 atm, what is the mole \fraction of CO2?
A. 0.98
B. 0.99
C. 0.995
D. 0.996
Question 14
A 2.0 M solution of HCl is titrated with 1.0 M NaOH. If 20 mL of NaOH is added, what is the concentration of HCl remaining?
A. 1.8 M
B. 1.9 M
C. 2.0 M
D. 2.1 M
Question 15
A metal M has a s\tandard reduction potential of -0.80 V. What is the s\tandard cell potential for the reaction: M^2+ + 2e^- → M?
A. -0.80 V
B. -0.60 V
C. -0.40 V
D. -0.20 V

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