POST UTME RSU 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of H2SO4 is titrated with a 0.1 M solution of NaOH. If 50 mL of NaOH is required to reach the equivalence point, determine the number of moles of H2SO4 present in 100 mL of the initial H2SO4 solution.
A. 0.005 mol
B. 0.01 mol
C. 0.015 mol
D. 0.02 mol
Question 2
A 5.00 g sample of a metal is heated in a crucible until it reaches a temperature of 1000°C. The mass of the crucible and metal is 10.0 g. What is the mass of the crucible?
A. 2.00 g
B. 3.00 g
C. 4.00 g
D. 5.00 g
Question 3
Determine the molar solubility of AgCl in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) for AgCl is 1.8 × 10^\( -10 \) and the solubility product cons\tant (Ksp) for NaCl is 3.2 × 10^\( -9 \).
A. 1.0 × 10^\( -5 \) M
B. 1.5 × 10^\( -5 \) M
C. 2.0 × 10^\( -5 \) M
D. 2.5 × 10^\( -5 \) M
Question 4
A 0.1 M solution of a salt is prepared by mixing 0.1 M HCl and 0.1 M NaOH. What is the concentration of the salt in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 5
A 2.5-g sample of an unknown hydrocarbon is combusted in a bomb calorimeter, producing 12.5 kJ of heat. If the combustion equation for the hydrocarbon is CxHy + O2 → CO2 + H2O, and the molar heat of combustion of CO2 is -393.5 kJ/mol, determine the molar mass of the hydrocarbon.
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol
Question 6
A sample of air contains 20% O2, 70% N2, and 10% CO2 by volume. If the total pressure is 1 atm, what is the partial pressure of CO2?
A. 0.01 atm
B. 0.02 atm
C. 0.03 atm
D. 0.04 atm
Question 7
A 2.50 L sample of a gas at 27°C and 1.00 atm is compressed to 0.500 L at 37°C. What is the new pressure?
A. 2.00 atm
B. 3.00 atm
C. 4.00 atm
D. 5.00 atm
Question 8
A sample of nitrogen gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of nitrogen gas?
A. 760 mmHg
B. 736.2 mmHg
C. 712.4 mmHg
D. 688.6 mmHg
Question 9
A polymer is formed by the condensation reaction between a diol and a diacid. If the molecular weight of the diol is 180 g/mol and the molecular weight of the diacid is 150 g/mol, what is the molecular weight of the polymer formed?
A. 225 g/mol
B. 250 g/mol
C. 275 g/mol
D. 300 g/mol
Question 10
A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. If 25 mL of the acid is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point for a 50 mL sample of the acid?
A. 10 mL
B. 25 mL
C. 50 mL
D. 75 mL
Question 11
A 1.0 M solution of H2SO4 is titrated with 1.0 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the concentration of the resulting solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 12
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after 25 mL of 0.1 M HCl is added to 50 mL of 0.1 M NaOH?
A. 4
B. 7
C. 10
D. 12
Question 13
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the pH of the resulting solution?
A. 9
B. 10
C. 11
D. 12
Question 14
A 2.0-g sample of a non-metallic oxide is heated in a stream of hydrogen gas, producing 1.2 L of water vapor at 25°C and 1 atm. If the molar volume of an ideal gas is 22.4 L/mol, determine the molar mass of the oxide.
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol
Question 15
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 25 mL of HCl has been added?
A. 1
B. 2
C. 3
D. 4

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