POST UTME AFE BABALOLA UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.0 L flask contains 0.5 mol of an ideal gas at 37°C. What is the pressure of the gas?
A. 2.5 atm
B. 3.5 atm
C. 4.5 atm
D. 5.5 atm
Question 2
A 25.0 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 10 mL
B. 20 mL
C. 25 mL
D. 30 mL
Question 3
The atomic number of an element is 12. What is the number of protons in the nucleus of an atom of this element?
A. 11
B. 12
C. 13
D. 14
Question 4
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 1.0 L of water. Calculate the concentration of Cl- ions in the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 5
A 2.5 L sample of a gas at 27°C and 1.5 atm is compressed to 2.0 L at cons\tant temperature. Calculate the new pressure in atm.
A. 2.25 atm
B. 2.5 atm
C. 3.0 atm
D. 3.5 atm
Question 6
A 2.5 M solution of HCl is prepared by dissolving 25 g of HCl in water to make 1 L of solution. What is the pH of the solution?
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 7
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after the titration?
A. 7
B. 8
C. 9
D. 10
Question 8
The reaction between nitrogen and oxygen to form nitrogen dioxide is represented by the equation: \text{N}_2 + \text{O}_2 \rightarrow \text{NO}_2. What is the oxidation state of nitrogen in the product?
A. -2
B. +2
C. +4
D. +6
Question 9
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. What is the pressure of the gas?
A. 2.5 atm
B. 3.5 atm
C. 4.5 atm
D. 5.5 atm
Question 10
A sample of an ideal gas is heated from 300 K to 400 K at cons\tant volume. Calculate the ratio of the final pressure to the initial pressure.
A. 1.33
B. 1.5
C. 2.0
D. 3.0
Question 11
A solution of potassium dichromate is titrated with iron(II) sulfate. The reaction is as follows: Cr2O72- + 6Fe2+ + 14H+ → 2Cr3+ + 6Fe3+ + 7H2O. If 25.0 mL of 0.0500 M Fe2+ is required to reach the \endpoint, what is the concentration of the dichromate solution?
A. 0.00250 M
B. 0.00500 M
C. 0.0125 M
D. 0.0250 M
Question 12
A mixture of 2.0 g of NaCl and 1.0 g of KCl is dissolved in 100 g of water. What is the boiling point elevation of the solution?
A. 0.20°C
B. 0.30°C
C. 0.40°C
D. 0.50°C
Question 13
A gas at 25°C and 1 atm is compressed to 4 atm. What is the new volume of the gas?
A. 0.25 L
B. 0.50 L
C. 1.00 L
D. 2.00 L
Question 14
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is present initially, how much will remain after 20 years?
A. 12.5 g
B. 25 g
C. 50 g
D. 100 g
Question 15
A solution contains 0.1 M NaCl. What is the concentration of Cl- ions?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M

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