POST UTME UNIOSUN 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. If the reaction is allowed to proceed to completion, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 2
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 3
A solution of 0.1 M NaCl is mixed with a solution of 0.1 M AgNO3. If the reaction is allowed to proceed to completion, what is the concentration of the chloride ion in the resulting solution?
A. 0.1 M
B. 0.05 M
C. 0.2 M
D. 0.05 M
Question 4
A sample of a non-metallic element has a mass of 50 g and a volume of 5 L. If the density of the element is 10 g/L, what is its molar mass?
A. 20 g/mol
B. 30 g/mol
C. 40 g/mol
D. 50 g/mol
Question 5
A sample of a non-metallic element has a mass of 25 g and a volume of 2.5 L. If the density of the element is 5 g/L, what is its molar mass?
A. 10 g/mol
B. 20 g/mol
C. 30 g/mol
D. 40 g/mol
Question 6
A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. If the reaction is allowed to proceed to completion, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 7
The s\tandard electrode potential of the couple Zn2+/Zn is -0.76 V. What is the s\tandard electrode potential of the couple Cu2+/Cu if the cell reaction is Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)?
A. -0.34 V
B. -0.76 V
C. 0.42 V
D. 1.18 V
Question 8
The half-reaction for the reduction of MnO4- is MnO4- + 8H+ + 5e- → Mn2+ + 4H2O. What is the s\tandard electrode potential of the couple MnO4-/Mn2+?
A. 1.51 V
B. 1.51 V
C. 1.51 V
D. 1.51 V
Question 9
A solution contains 0.100 M NaOH and 0.0500 M HCl. What is the pH of the resulting solution?
A. ( 7.00 )
B. ( 9.00 )
C. ( 10.0 )
D. ( 12.0 )
Question 10
A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in enough water to make 1.00 L of solution. What is the molarity of the solution?
A. 0.500 M
B. 1.00 M
C. 2.00 M
D. 5.00 M
Question 11
A sample of an ideal gas is heated from 300 K to 400 K at cons\tant volume. What is the ratio of the final pressure to the initial pressure?
A. 1.33
B. 2.00
C. 3.00
D. 4.00
Question 12
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. \( -110.5 \) kJ/mol
B. \( -110.5 \) kJ/mol
C. \( -110.5 \) kJ/mol
D. \( -110.5 \) kJ/mol
Question 13
A 1.00 M solution of HCl is prepared by dissolving 36.5 g of HCl in enough water to make 1.00 L of solution. What is the pH of the solution?
A. 0.000
B. 1.00
C. 2.00
D. 3.00
Question 14
Solve for x in the equation: \( \log_{10} \( x^2 \ \) = 4 ).
A. 2
B. 4
C. 8
D. 16
Question 15
Determine the oxidation state of nitrogen in the compound NO2.
A. +1
B. +2
C. +3
D. +4

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