POST UTME BELLS UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 g sample of a subs\tance is dissolved in 50 mL of water. If the resulting solution has a concentration of 0.25 M, what is the molar mass of the subs\tance?
A. 10 g/mol
B. 20 g/mol
C. 30 g/mol
D. 40 g/mol
Question 2
A 25.0 mL sample of 0.100 M NaOH is mixed with 25.0 mL of 0.100 M HCl. What is the pH of the resulting solution?
A. 7.00
B. 7.50
C. 8.00
D. 9.00
Question 3
A solution contains 1.0 g of glu\cose (C6H12O6) per 100 mL of solution. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 4
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To measure the pH of the solution
Question 5
A 1.0 M solution of sodium chloride (NaCl) is mixed with a 1.0 M solution of hydrochloric acid (HCl). If 100 mL of the sodium chloride solution is mixed with 100 mL of the hydrochloric acid solution, what is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 6
A 2.5 M solution of sulfuric acid is prepared by dissolving 25 g of sulfuric acid in 100 mL of water. What is the concentration of the solution in moles per liter?
A. 2.5 M
B. 5.0 M
C. 10.0 M
D. 12.5 M
Question 7
A 1.0 L sample of a gas at 298 K has a pressure of 1.0 atm. What is the volume of the gas at 373 K if the temperature increases by 50 K?
A. 1.5 L
B. 2.0 L
C. 2.5 L
D. 3.0 L
Question 8
A 2.0 g sample of a subs\tance is dissolved in 100 mL of water. The resulting solution has a concentration of 0.1 M. What is the molar mass of the subs\tance?
A. 20 g/mol
B. 40 g/mol
C. 60 g/mol
D. 80 g/mol
Question 9
The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is initially present, what is the amount of the subs\tance remaining after 10 years?
A. 50 g
B. 25 g
C. 12.5 g
D. 6.25 g
Question 10
The reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) is as follows: NaOH + HCl → NaCl + H2O. If 100 mL of 0.5 M NaOH is mixed with 100 mL of 0.5 M HCl, what is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 11
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the solution
B. To measure the pH of the solution
C. To measure the temperature of the solution
D. To measure the density of the solution
Question 12
A 2.5 M solution of sodium hydroxide is prepared by dissolving 25 g of sodium hydroxide in 100 mL of water. What is the concentration of the solution in moles per liter?
A. 2.5 M
B. 5.0 M
C. 10.0 M
D. 12.5 M
Question 13
A 1.0 M solution of AgNO3 is mixed with a 1.0 M solution of NaCl. If the reaction is allowed to go to completion, what is the concentration of AgCl that will precipitate out of the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 14
The reaction of calcium metal with oxygen gas is represented by the equation: 2Ca(s) + O2(g) → 2CaO(s). If 2.0 g of calcium metal is added to 1.0 L of oxygen gas, what is the limiting reac\tant?
A. Ca(s)
B. O2(g)
C. CaO(s)
D. None of the above
Question 15
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
B. 2
C. 3
D. 4

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