POST UTME IMS U 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1 L solution of H2SO4 contains 0.5 mol of H2SO4. What is the concentration of H+ ions in the solution?
A. 0.25 M
B. 0.5 M
C. 1 M
D. 2 M
Question 2
A 2.0 g sample of a metal is dissolved in 50 mL of 0.1 M HCl. If the reaction is 100% efficient, what is the number of moles of the metal dissolved?
A. 0.05 mol
B. 0.1 mol
C. 0.2 mol
D. 0.5 mol
Question 3
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. Calculate the concentration of the resulting solution.
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 4
A reaction is represented by the equation: 2A + B → 2C + D. If 2 moles of A and 1 mole of B are present initially, and 1 mole of C is produced after 10 minutes, what is the rate of reaction?
A. 0.5 mol/min
B. 1 mol/min
C. 2 mol/min
D. 5 mol/min
Question 5
A 2.5 g sample of a non-metallic element is heated in a crucible until it is completely vaporized. The mass of the crucible and its contents after heating is 3.2 g. What is the molar mass of the element?
A. 20 g/mol
B. 40 g/mol
C. 60 g/mol
D. 80 g/mol
Question 6
A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 7
The rate cons\tant (k) for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 8
A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. Calculate the pH of the resulting solution.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 9
A solution contains 0.1 M NaCl. If 10 mL of 0.1 M HCl is added to 90 mL of the solution, what is the new concentration of Cl^-?
A. 0.1 M
B. 0.11 M
C. 0.12 M
D. 0.13 M
Question 10
A sample of a hydrocarbon has a molecular formula of C_5H_{12}. What is the type of hydrocarbon?
A. Alkane
B. Alkene
C. Alkyne
D. Aromatic hydrocarbon
Question 11
Determine the number of moles of oxygen gas (O2) required to react with 2.5 moles of carbon monoxide (CO) in the following equation: 2CO + O2 → 2CO2.
A. 1.25 moles
B. 2.5 moles
C. 5 moles
D. 10 moles
Question 12
A sample of nitrogen gas (N2) is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.02 atm, calculate the mole \fraction of nitrogen gas.
A. 0.98
B. 0.99
C. 0.995
D. 0.999
Question 13
A 0.1 M solution of NaCl is prepared by dissolving 2.5 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.25 M
Question 14
A 1 L solution of 0.1 M NaOH is mixed with a 1 L solution of 0.2 M HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 15
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 20 mL of HCl has been added?
A. 7.0
B. 6.0
C. 5.0
D. 4.0

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