POST UTME BABCOCK UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.50-g sample of a compound containing only carbon and hydrogen is burned in a combustion calorimeter. The mass of carbon dioxide produced is 3.25 g, and the mass of water produced is 1.75 g. Calculate the empirical formula of the compound.
A. CH
B. C2H4
C. C3H6
D. C4H8
Question 2
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of copper in the reac\tant and product?
A. Cu(II) in reac\tant, Cu(0) in product
B. Cu(0) in reac\tant, Cu(II) in product
C. Cu(II) in reac\tant, Cu(II) in product
D. Cu(0) in reac\tant, Cu(0) in product
Question 3
A solution contains 10.0 g of glu\cose per 100 mL of water. What is the molarity of the solution?
A. 0.2 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 4
A sample of a non-metallic element has a mass of 2.5 g and a volume of 10 mL. If the density of the element is 5.0 g/mL, what is the molar mass of the element?
A. 50 g/mol
B. 100 g/mol
C. 150 g/mol
D. 200 g/mol
Question 5
A 2.00 g sample of a metal hydroxide is heated in a stream of CO2 gas. If 1.50 g of CO2 is produced, what is the empirical formula of the metal hydroxide?
A. Fe(OH)2
B. Fe(OH)3
C. Fe(OH)4
D. Fe(OH)5
Question 6
The solubility of lead(II) chloride in water is 1.26 g/100 mL at 25°C. What is the molar solubility of lead(II) chloride?
A. 0.0126 M
B. 0.126 M
C. 1.26 M
D. 12.6 M
Question 7
A solution of sulfuric acid (H2SO4) has a concentration of 0.500 M. If 25.0 mL of the solution is diluted to a total volume of 100.0 mL, what is the new concentration of the solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 8
The molecular formula for a compound containing nitrogen and oxygen is C2H4N2O2. If 2.50 g of the compound contains 0.750 g of nitrogen, calculate the percentage composition of nitrogen in the compound.
A. 14.29%
B. 15.38%
C. 16.67%
D. 17.86%
Question 9
A 1.00-g sample of a compound containing only carbon and hydrogen is dissolved in 25.0 mL of water. The solution is then titrated with a solution of 0.100 M HCl. What is the number of moles of HCl required to neutralize the solution?
A. 0.005
B. 0.01
C. 0.015
D. 0.02
Question 10
Determine the number of moles of CO2 produced when 2.5 g of C6H12O6 is completely combusted in the presence of excess O2.
A. 0.25 mol
B. 0.5 mol
C. 1.0 mol
D. 1.5 mol
Question 11
A solution of sodium chloride (NaCl) has a concentration of 0.500 M. If 25.0 mL of the solution is diluted to a total volume of 100.0 mL, what is the new concentration of the solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 12
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 25 mL of NaOH is added to 25 mL of HCl, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 13
A solution contains 5.0 g of NaCl per 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 14
A 0.5 M solution of a weak acid HA is mixed with a 0.2 M solution of a strong base NaOH. If the initial volume of the acid solution is 50 mL and the initial volume of the base solution is 100 mL, what is the pH of the resulting solution after complete neutralization?
A. 3.5
B. 4.5
C. 5.5
D. 6.5
Question 15
A sample of a ha\logen has a mass of 2.50 g. If the mass of the sample is 1.25 g, what is the mass of the ha\logen in the sample?
A. 1.25 g
B. 1.50 g
C. 1.75 g
D. 2.00 g

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: