POST UTME CRAWFORD UNIVERSITY 2025 Chemistry | Objective

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Question 1
A polymer has a molecular weight of 100,000 g/mol. If 1.00 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 0.10 g/L
B. 1.00 g/L
C. 10.0 g/L
D. 100 g/L
Question 2
A solution contains 0.500 mol of KCl and 0.250 mol of NaCl. What is the total number of moles of chloride ions in the solution?
A. 0.500
B. 0.750
C. 1.000
D. 1.250
Question 3
A 500 mL sample of a solution containing 0.1 M NaCl is titrated with 1 M AgNO3. If 20 mL of AgNO3 is required to reach the equivalence point, what is the concentration of the NaCl solution?
A. \( C_{NaCl} = \frac{0.1 \times 20}{500} \)
B. \( C_{NaCl} = \frac{0.1 \times 20}{500 \times 1} \)
C. \( C_{NaCl} = \frac{0.1 \times 20}{500 \times 1 \times 1} \)
D. \( C_{NaCl} = \frac{0.1 \times 20}{500 \times 1 \times 1 \times 1} \)
Question 4
A 2.00 L flask contains 0.100 mol of CO2 at 25°C. What is the partial pressure of CO2 in the flask?
A. 0.100
B. 0.200
C. 0.300
D. 0.400
Question 5
A metal M reacts with oxygen to form a basic oxide MO. The reaction is as follows: 4M + 3O2 → 2MO2. What is the oxidation number of M?
A. +2
B. +3
C. +4
D. +5
Question 6
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 7
A solution of 0.50 M NaCl is prepared by dissolving 0.50 g of NaCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.50 g/L
B. 0.25 g/L
C. 1.00 g/L
D. 2.00 g/L
Question 8
A solution of 0.10 M HCl is prepared by dissolving 0.10 g of HCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.10 g/L
B. 0.25 g/L
C. 0.50 g/L
D. 1.00 g/L
Question 9
Determine the rate cons\tant (k) for the reaction: 2NO(g) + O2(g) → 2NO2(g) at 298 K, given that the initial concentrations of NO and O2 are 0.1 M and 0.2 M, respectively, and the rate of reaction is 0.05 M/s.
A. \( k = \frac{0.05}{[NO]^2[O_2]} \)
B. \( k = \frac{0.05}{[NO][O_2]} \)
C. \( k = \frac{0.05}{[NO]^2} \)
D. \( k = \frac{0.05}{[O_2]^2} \)
Question 10
A sample of nitrogen gas (N2) has a volume of 2.5 L at a pressure of 1 atm and a temperature of 273 K. What is the number of moles of nitrogen gas?
A. 0.01 mol
B. 0.1 mol
C. 1 mol
D. 10 mol
Question 11
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 25.0 mL of NaOH?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 12
A 25 mL sample of an aqueous solution containing 0.5 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 12.5 mL
B. 15 mL
C. 20 mL
D. 25 mL
Question 13
A polymer has a molecular weight of 50,000 g/mol. If 0.50 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 0.05 g/L
B. 0.10 g/L
C. 0.25 g/L
D. 0.50 g/L
Question 14
A 100 mL sample of an aqueous solution containing 0.2 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 20 mL
B. 25 mL
C. 30 mL
D. 35 mL
Question 15
A sample of oxygen gas (O2) has a volume of 1.5 L at a pressure of 2 atm and a temperature of 300 K. What is the number of moles of oxygen gas?
A. 0.05 mol
B. 0.1 mol
C. 0.5 mol
D. 1 mol

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