POST UTME CALEB UNIVERSITY 2025 Chemistry | Objective

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Question 1
Determine the molar mass of a polymer with the following monomer units: CH2=CH-CH3, CH2=CH-CH2-CH3, and CH2=CH-CH2-CH2-CH3. The polymer has a molecular formula of \( CH2=CH-CH3 \)n, \( CH2=CH-CH2-CH3 \)m, and \( CH2=CH-CH2-CH2-CH3 \)p.
A. 120 g/mol
B. 180 g/mol
C. 240 g/mol
D. 300 g/mol
Question 2
The s\tandard electrode potential of the cell is 1.10 V. If the cell is connected to a 10.0 Ω resistor, what is the current flowing through the cell?
A. 0.50 A
B. 1.00 A
C. 2.00 A
D. 3.00 A
Question 3
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate 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 4
A 2.00 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. The vapor pressure of water at 25°C is 23.8 torr. What is the partial pressure of the gas?
A. 0.976 atm
B. 0.987 atm
C. 0.998 atm
D. 1.01 atm
Question 5
A 5.00 g sample of a polymer is dissolved in 100.0 mL of solvent. The resulting solution has a vis\cosity of 0.500 Pa·s. What is the molar mass of the polymer?
A. 10,000 g/mol
B. 20,000 g/mol
C. 30,000 g/mol
D. 40,000 g/mol
Question 6
A 10.0 g sample of a metal is heated to 1000°C and then quenched in water. The resulting solution is 0.500 M in metal ions. What is the molar mass of the metal?
A. 40.0 g/mol
B. 50.0 g/mol
C. 60.0 g/mol
D. 70.0 g/mol
Question 7
A 2.00 g sample of a metal is heated in a crucible until it melts. The mass of the crucible and the metal is 2.50 g. After heating, the mass of the crucible and the metal is 2.20 g. What is the density of the metal?
A. 8.00 g/cm³
B. 9.00 g/cm³
C. 10.0 g/cm³
D. 11.0 g/cm³
Question 8
A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in 1.00 L of water. What is the concentration of OH- ions in the solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 9
A 10.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 20.0 mL of NaOH.
A. 3.00
B. 4.00
C. 5.00
D. 6.00
Question 10
A solution contains 0.100 M NH₃ and 0.100 M HCl. What is the pH of the solution?
A. 4.00
B. 5.00
C. 6.00
D. 7.00

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