POST UTME RHEMA UNIVERSITY 2025 Chemistry | Objective

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Question 1
A 2.5 M solution of NaOH is prepared by dissolving 25 g of NaOH in enough water to make 1 L of solution. Calculate the number of moles of NaOH used in preparing the solution.
A. 0.1 mol
B. 0.25 mol
C. 0.5 mol
D. 1 mol
Question 2
The diagram below shows the structure of a polymer.
A. A is a monomer and B is a polymer
B. A is a polymer and B is a monomer
C. A is a monomer and B is a polymer
D. A is a polymer and B is a polymer
Question 3
A 10.0 cm³ sample of a gas at 25.0°C and 1.00 atm is collected over water at 25.0°C. The total pressure of the gas is 1.50 atm. Calculate the partial pressure of the gas.
A. 0.50 atm
B. 1.00 atm
C. 1.25 atm
D. 1.50 atm
Question 4
A 2.50 L sample of a gas at 25°C and 1.00 atm is collected over water. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the gas?
A. 0.97 atm
B. 1.00 atm
C. 1.03 atm
D. 1.05 atm
Question 5
A 0.1 M solution of NaOH is prepared by dissolving 0.1 mol of NaOH in enough water to make 1 L of solution. Calculate the mass of NaOH used in preparing the solution.
A. 10 g
B. 20 g
C. 30 g
D. 40 g
Question 6
A 2.00 L flask contains 1.50 atm of nitrogen gas at 298 K. If 1.00 atm of nitrogen gas is added, what is the new pressure?
A. 1.50 atm
B. 2.00 atm
C. 2.50 atm
D. 3.00 atm
Question 7
A 0.5 M solution of a weak acid HA is titrated with 0.5 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the initial concentration of HA?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1 M
Question 8
A 1.00 L flask contains 0.500 mol of O2 at 25°C. What is the partial pressure of O2 in the flask?
A. 0.500 atm
B. 1.00 atm
C. 2.00 atm
D. 5.00 atm
Question 9
A 2.00g sample of a compound is mixed with 10.0mL of 0.100M HCl. If the resulting solution requires 5.00mL of 0.100M NaOH for neutralization, what is the molar mass of the compound?
A. 100g/mol
B. 150g/mol
C. 200g/mol
D. 250g/mol
Question 10
Determine the empirical formula of a compound containing 40.0g of carbon, 6.0g of hydrogen, and 54.0g of oxygen.
A. CH2O
B. C2H4O2
C. C3H6O3
D. C4H8O4
Question 11
A 1.00 L flask contains 0.500 mol of H2 at 25°C. What is the partial pressure of H2 in the flask?
A. 0.500 atm
B. 1.00 atm
C. 2.00 atm
D. 5.00 atm
Question 12
A 1.00 L flask contains 0.500 mol of CO at 25°C. What is the partial pressure of CO in the flask?
A. 0.500 atm
B. 1.00 atm
C. 2.00 atm
D. 5.00 atm
Question 13
The reaction between methane and oxygen is highly exothermic. If 10.0 g of methane is mixed with 50.0 g of oxygen, what is the maximum temperature that can be reached?
A. 50°C
B. 60°C
C. 70°C
D. 80°C
Question 14
The reaction between sulfuric acid and sodium hydroxide is highly exothermic. If 25.0 g of sulfuric acid is mixed with 50.0 g of sodium hydroxide, what is the maximum temperature that can be reached?
A. 50°C
B. 60°C
C. 70°C
D. 80°C
Question 15
A 2.00 L flask contains 1.50 atm of oxygen gas at 298 K. If 1.00 atm of oxygen gas is added, what is the new pressure?
A. 1.50 atm
B. 2.00 atm
C. 2.50 atm
D. 3.00 atm

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