POST UTME RSU 2024 Chemistry | Objective

Are you preparing for POST UTME RSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
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
Correct C. 275 g/mol
D. 300 g/mol

Correct Answer: C

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Question 2
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
Correct D. 4

Correct Answer: D

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Question 3
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
Correct B. 736.2 mmHg
C. 712.4 mmHg
D. 688.6 mmHg

Correct Answer: B

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Question 4
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 5
A sample of sulfur dioxide 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 sulfur dioxide gas?
A. 760 mmHg
Correct B. 736.2 mmHg
C. 712.4 mmHg
D. 688.6 mmHg

Correct Answer: B

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Question 6
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
Correct B. 25 mL
C. 50 mL
D. 75 mL

Correct Answer: B

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Question 7
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
Correct B. 7
C. 10
D. 12

Correct Answer: B

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Question 8
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?
Correct A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M

Correct Answer: A

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Question 9
A 0.1 M solution of a salt is prepared by mixing 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 4
Correct B. 7
C. 10
D. 12

Correct Answer: B

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Question 10
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 acid in the solution?
Correct A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M

Correct Answer: A

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Question 11
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
Correct B. 1.5 × 10^\( -5 \) M
C. 2.0 × 10^\( -5 \) M
D. 2.5 × 10^\( -5 \) M

Correct Answer: B

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Question 12
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
Correct C. 100 g/mol
D. 125 g/mol

Correct Answer: C

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Question 13
A 0.1 M solution of HCl is titrated with a 0.1 M solution of NaOH. If 25 mL of NaOH is required to reach the equivalence point, determine the number of moles of HCl present in 100 mL of the initial HCl solution.
A. 0.005 mol
Correct B. 0.01 mol
C. 0.015 mol
D. 0.02 mol

Correct Answer: B

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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
Correct C. 100 g/mol
D. 125 g/mol

Correct Answer: C

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Question 15
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
Correct B. 0.01 mol
C. 0.015 mol
D. 0.02 mol

Correct Answer: B

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Question 16
Determine the empirical formula of a compound containing 40.0 g of carbon, 6.0 g of hydrogen, and 54.0 g of oxygen, assuming a 100.0 g sample.
Correct A. CH2O
B. C2H4O2
C. C3H6O
D. C4H8O2

Correct Answer: A

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Question 17
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
Correct B. 3.00 atm
C. 4.00 atm
D. 5.00 atm

Correct Answer: B

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Question 18
A solution contains 25.0 g of NaCl in 250.0 mL of water. What is the molarity of the solution?
A. 0.100 M
Correct B. 0.200 M
C. 0.300 M
D. 0.400 M

Correct Answer: B

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Question 19
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
Correct C. 4.00 g
D. 5.00 g

Correct Answer: C

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Question 20
A 2.00 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
Correct B. 3.00 atm
C. 4.00 atm
D. 5.00 atm

Correct Answer: B

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Question 21
The reaction 2NO(g) + O2(g) → 2NO2(g) has an equilibrium cons\tant Kp = 1.5 × 10^\( -3 \) at 298 K. If the partial pressure of NO is 0.05 atm, calculate the partial pressure of NO2.
Correct A. 0.001 atm
B. 0.005 atm
C. 0.01 atm
D. 0.015 atm

Correct Answer: A

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Question 22
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
Correct B. 10
C. 11
D. 12

Correct Answer: B

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Question 23
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
Correct B. 0.02 atm
C. 0.03 atm
D. 0.04 atm

Correct Answer: B

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Question 24
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
Correct B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: B

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Question 25
A sample of water contains 10 ppm of Cl^- ions. If the sample is titrated with 0.1 M AgNO3, what is the volume of AgNO3 required to reach the equivalence point?
A. 10 mL
Correct B. 20 mL
C. 30 mL
D. 40 mL

Correct Answer: B

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