POST UTME ACHIEVERS UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of HCl is titrated with 0.1 M NaOH. If 10 mL of NaOH is required to reach the equivalence point, what is the pH of the solution at the equivalence point?
A. 7
B. 8
C. 9
D. 10
Question 2
What is the s\tandard enthalpy of formation of CO2(g)?
A. -393.5 kJ/mol
B. -393.5 kJ/mol
C. -393.5 kJ/mol
D. -393.5 kJ/mol
Question 3
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point in a 50 mL solution?
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 4
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 12.5 g of NaOH in 250 mL of water. Calculate the concentration of the solution in terms of molarity.
A. 2.5 M
B. 5.0 M
C. 10.0 M
D. 12.5 M
Question 5
A reaction is represented by the equation: \[ 2A + B \rightarrow 3C + D \]. If 2.00 mol of A and 1.50 mol of B are present initially, and 3.00 mol of C are produced, calculate the limiting reac\tant.
A. A
B. B
C. Neither A nor B
D. Both A and B
Question 6
A 1.0 g sample of a compound containing only carbon and hydrogen is analyzed by combustion. The volume of CO2 produced is 0.8 L at STP. What is the percentage of carbon in the compound?
A. 20%
B. 30%
C. 40%
D. 50%
Question 7
A metal M has a s\tandard electrode potential of +0.5 V. What is the s\tandard potential of the metal ion M2+?
A. -0.5
B. 0
C. 0.5
D. 1
Question 8
A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 200. What is the molar mass of the repeating unit?
A. 250
B. 500
C. 750
D. 1000
Question 9
A metal M has a density of 10 g/cm3. What is the volume of 100 g of M?
A. 10 cm3
B. 20 cm3
C. 30 cm3
D. 40 cm3
Question 10
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 12.5 g of NaOH in 250 mL of water. Calculate the concentration of the solution in terms of molarity.
A. 2.5 M
B. 5.0 M
C. 10.0 M
D. 12.5 M
Question 11
A 2.0 M solution of HCl is diluted to 1.0 M. What is the new volume of the solution?
A. 2 L
B. 4 L
C. 8 L
D. 16 L
Question 12
A 25 mL sample of 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.025
B. 0.05
C. 0.1
D. 0.2
Question 13
A metal M has a density of 10 g/cm3. What is the volume of 100 g of M?
A. 10 cm3
B. 20 cm3
C. 30 cm3
D. 40 cm3
Question 14
A 0.1 M solution of hydrochloric acid (HCl) is prepared by dissolving 0.1 g of HCl in 100 mL of water. Calculate the concentration of the solution in terms of molarity.
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 15
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HNO3. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4

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