POST UTME IGBINEDION UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.00 g sample of a subs\tance is dissolved in 100.0 mL of solvent. If the concentration of the solution is 0.200 g/mL, what is the molarity of the solution?
A. 0.100 M
B. 0.200 M
C. 0.500 M
D. 1.00 M
Question 2
In a titration experiment, 25.0 mL of 0.100 M NaOH was added to 20.0 mL of 0.0500 M HCl. What is the concentration of the HCl solution if the reaction is assumed to be complete?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 3
A metal (X) reacts with chlorine gas to form a white solid. The reaction is as follows: X + Cl2 → XCl2. If 2.50 g of X is reacted with 1.00 g of Cl2, calculate the mass of XCl2 formed.
A. 3.50 g
B. 4.00 g
C. 4.50 g
D. 5.00 g
Question 4
A 2.50 g sample of a polymer is dissolved in 50.0 mL of solvent. If the concentration of the solution is 0.500 g/mL, what is the molar mass of the polymer?
A. 500 g/mol
B. 1000 g/mol
C. 2000 g/mol
D. 5000 g/mol
Question 5
A 1.00-L sample of a solution containing 0.500 M NaOH is titrated with 0.250 M HCl. Calculate the pH of the solution after the titration.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
A 1.00 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the gas?
A. 0.976 atm
B. 0.987 atm
C. 0.998 atm
D. 1.00 atm
Question 7
A solution of NaCl is prepared by dissolving 35.5 g of NaCl in 250 mL of water. Calculate the molarity of the solution.
A. 0.25 M
B. 0.50 M
C. 0.75 M
D. 1.00 M
Question 8
A 2.50-g sample of a metal carbonate is heated to produce a metal oxide. If the mass of the metal oxide is 1.75 g, calculate the percentage yield of the metal oxide.
A. 85.71%
B. 90.91%
C. 95.45%
D. 92.31%
Question 9
A 1.00 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the mole \fraction of the gas?
A. 0.976
B. 0.987
C. 0.998
D. 1.00
Question 10
A 25.0-mL sample of a solution containing 0.500 M NaOH is titrated with 0.250 M HCl. Calculate the number of moles of HCl required to neutralize the NaOH.
A. 0.00625 mol
B. 0.0125 mol
C. 0.01875 mol
D. 0.025 mol

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