POST UTME BOWEN UNIVERSITY 2019 Chemistry | Objective

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Question 1
A 2.5 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 2.0 g, calculate the percentage yield of the metal oxide.
A. 80%
B. 85%
C. 90%
D. 95%
Question 2
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 atm
B. 2.02 atm
C. 3.03 atm
D. 4.04 atm
Question 3
A solution containing 0.1 M HCl and 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 20 mL of HCl has been added?
A. 1
B. 2
C. 3
D. 4
Question 4
A 2.5 M solution of sodium chloride (NaCl) is prepared by dissolving 125 g of NaCl in 1 L of water. Calculate the number of moles of NaCl dissolved.
A. 2.14
B. 2.15
C. 2.16
D. 2.17
Question 5
A 25 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 6
A 2.5 M solution of potassium hydroxide (KOH) is prepared by dissolving 125 g of KOH in 1 L of water. Calculate the number of moles of KOH dissolved.
A. 2.23
B. 2.24
C. 2.25
D. 2.26
Question 7
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 25.0 mL of NaOH.
A. \( pH = 7 + \log_{10} left\( \frac{[OH^-]}{[H_2O]} \right \ \) )
B. \( pH = 7 - \log_{10} left\( \frac{[OH^-]}{[H_2O]} \right \ \) )
C. \( pH = 7 + \log_{10} left\( \frac{[H_2O]}{[OH^-]} \right \ \) )
D. \( pH = 7 - \log_{10} left\( \frac{[H_2O]}{[OH^-]} \right \ \) )
Question 8
A 20 mL sample of 0.2 M HCl is titrated with 0.2 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 9
The atomic radius of an element is 100 pm. If the element has an atomic number of 12, what is its electron configuration?
A. [Ne] 3s^2 3p^6
B. [Ne] 3s^2 3p^6 4s^2
C. [Ne] 3s^2 3p^6 4s^1
D. [Ne] 3s^2 3p^6 4s^2 4p^1
Question 10
In the context of acid-base chemistry, what is the pH of a solution that is 0.1 M in HCl?
A. 1
B. 2
C. 3
D. 4
Question 11
A solution contains 10 g of NaCl in 100 g of water. Calculate the molality of the solution.
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 12
A 2.5 g sample of a metal oxide is heated in a crucible to produce 1.2 g of the metal. What is the percentage yield of the metal?
A. 60%
B. 70%
C. 80%
D. 90%
Question 13
A 10 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution at the equivalence point.
A. 7
B. 8
C. 9
D. 10
Question 14
A 2.5 M solution of sulfuric acid (H2SO4) is prepared by dissolving 125 g of H2SO4 in 1 L of water. Calculate the number of moles of H2SO4 dissolved.
A. 1.28
B. 1.28
C. 1.29
D. 1.30
Question 15
A solution contains 0.1 M H2SO4. What is the concentration of H+ ions in the solution?
A. 0.05
B. 0.1
C. 0.15
D. 0.2

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