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POST UTME AFE BABALOLA UNIVERSITY 2024 Chemistry | Objective

Are you preparing for POST UTME AFE BABALOLA UNIVERSITY 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.

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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.

A. 120 g/mol

B. 150 g/mol

Correct C. 180 g/mol

D. 200 g/mol

Correct Answer: C

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Question 2

A 0.500 M solution of NaCl is prepared by dissolving 25.0 g of NaCl in 1.00 L of water. What is the concentration of Cl- ions in the solution?

A. 0.250 M

Correct B. 0.500 M

C. 0.750 M

D. 1.00 M

Correct Answer: B

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Question 3

The diagram below shows a titration setup.

A. The burette contains the acid.

B. The beaker contains the acid.

Correct C. The burette contains the base.

D. The beaker contains the base.

Correct Answer: C

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Question 4

A sample of nitrogen gas occupies a volume of 2.50 L at a pressure of 1.00 atm and a temperature of 298 K. What is the new volume of the gas if the pressure is increased to 2.00 atm and the temperature is decreased to 273 K?

A. 1.00 L

Correct B. 1.25 L

C. 1.50 L

D. 2.00 L

Correct Answer: B

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Question 5

The diagram below shows a simple black and white chemistry apparatus showing titration setup.

A. The burette contains the acid.

B. The beaker contains the acid.

Correct C. The burette contains the base.

D. The beaker contains the base.

Correct Answer: C

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Question 6

Determine the molar mass of a polymer with the following repeating unit: CH2CH2OCH3. Assume that the polymer has a degree of polymerization of 100.

A. 100 g/mol

Correct B. 200 g/mol

C. 300 g/mol

D. 400 g/mol

Correct Answer: B

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Question 7

A metal (M) reacts with chlorine gas to form a white solid. The reaction is as follows: 2M + Cl2 → 2MCl. If 2.5 g of M reacts with 1.5 g of Cl2, what is the percentage yield of MCl?

A. 75%

Correct B. 80%

C. 85%

D. 90%

Correct Answer: B

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Question 8

A solution of sodium hydroxide (NaOH) is titrated with a solution of hydrochloric acid (HCl). The reaction is as follows: NaOH + HCl → NaCl + H2O. If 25 mL of 0.1 M NaOH is titrated with 20 mL of 0.2 M HCl, what is the concentration of the remaining NaOH solution?

Correct A. 0.05 M

B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: A

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Question 9

A sample of nitrogen gas (N2) is collected over water at a temperature of 25°C and a pressure of 1 atm. If the volume of the gas is 2.5 L, what is the partial pressure of the nitrogen gas?

A. 0.95 atm

Correct B. 0.98 atm

C. 1.02 atm

D. 1.05 atm

Correct Answer: B

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Question 10

A solution of sulfuric acid (H2SO4) is titrated with a solution of sodium hydroxide (NaOH). The reaction is as follows: H2SO4 + 2NaOH → Na2SO4 + 2H2O. If 20 mL of 0.5 M H2SO4 is titrated with 15 mL of 0.2 M NaOH, what is the concentration of the remaining H2SO4 solution?

A. 0.25 M

B. 0.3 M

Correct C. 0.35 M

D. 0.4 M

Correct Answer: C

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Question 11

A 2.5 L sample of a gas at 27°C and 1.2 atm is compressed to 0.5 L at 37°C. Calculate the new pressure, assuming ideal gas behavior.

A. 2.5 atm

B. 3.2 atm

Correct C. 4.8 atm

D. 5.6 atm

Correct Answer: C

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Question 12

A 25% solution of NaOH is titrated with 0.1 M HCl. If 25 mL of HCl is required to reach the equivalence point, calculate the number of moles of NaOH.

A. 0.0125 mol

Correct B. 0.025 mol

C. 0.0375 mol

D. 0.05 mol

Correct Answer: B

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Question 13

A 0.5 M solution of FeSO4 is mixed with a 0.2 M solution of NaOH. If the resulting solution is 0.1 M in Fe(OH)2, calculate the initial concentration of FeSO4.

A. 0.25 M

Correct B. 0.5 M

C. 0.75 M

D. 1 M

Correct Answer: B

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Question 14

A 2.5 L sample of a gas at 27°C and 1.2 atm is compressed to 0.5 L at 37°C. Calculate the new pressure, assuming ideal gas behavior.

A. 2.5 atm

B. 3.2 atm

Correct C. 4.8 atm

D. 5.6 atm

Correct Answer: C

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Question 15

A 25% solution of NaOH is titrated with 0.1 M HCl. If 25 mL of HCl is required to reach the equivalence point, calculate the number of moles of NaOH.

A. 0.0125 mol

Correct B. 0.025 mol

C. 0.0375 mol

D. 0.05 mol

Correct Answer: B

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Question 16

A 0.1 M solution of sulfuric acid (H2SO4) is titrated with a 0.1 M solution of sodium hydroxide (NaOH). If 25 mL of NaOH is required to reach the equivalence point, what is the volume of H2SO4 in liters?

Correct A. 0.025 L

B. 0.025 mL

C. 0.25 L

D. 0.25 mL

Correct Answer: A

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Question 17

A diagram of a titration apparatus is shown below. If the burette contains 25 mL of a 0.1 M solution of NaOH, and the initial pH of the solution is 3.5, what is the pH of the solution after adding 10 mL of the NaOH solution?

A. 4.5

Correct B. 5.5

C. 6.5

D. 7.5

Correct Answer: B

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Question 18

A 2.0 g sample of a non-metallic oxide is dissolved in 100 mL of water to form a solution with a pH of 4.5. If the molar mass of the oxide is 80 g/mol, what is the concentration of the solution in moles per liter?

Correct A. 0.025 M

B. 0.025 mL

C. 0.25 M

D. 0.25 mL

Correct Answer: A

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Question 19

A diagram of a gas apparatus is shown below. If the pressure of the gas is 2 atm and the volume is 100 mL, what is the temperature of the gas in Kelvin?

A. 300 K

Correct B. 400 K

C. 500 K

D. 600 K

Correct Answer: B

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Question 20

A 1.0 M solution of a non-metallic oxide is titrated with a 1.0 M solution of a strong acid. If 20 mL of the acid is required to reach the equivalence point, what is the volume of the oxide solution in liters?

Correct A. 0.02 L

B. 0.02 mL

C. 0.2 L

D. 0.2 mL

Correct Answer: A

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Question 21

A 2.50 L flask contains 0.500 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.

Correct A. 1.01 x 10^5 Pa

B. 2.02 x 10^5 Pa

C. 3.03 x 10^5 Pa

D. 4.04 x 10^5 Pa

Correct Answer: A

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Question 22

A solution contains 0.100 M HCl and 0.100 M NaOH. What is the pH of the solution after mixing 50.0 mL of each solution?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 23

A 1.00 L flask contains 0.500 mol of a gas at 298 K. If the gas is heated to 373 K, what is the new volume of the gas?

A. 1.50 L

B. 2.00 L

Correct C. 2.50 L

D. 3.00 L

Correct Answer: C

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Question 24

A 2.00 L flask contains 0.500 mol of a gas at 298 K. If the gas is compressed to 1.00 L, what is the new pressure of the gas?

A. 2.00 x 10^5 Pa

B. 3.00 x 10^5 Pa

Correct C. 4.00 x 10^5 Pa

D. 5.00 x 10^5 Pa

Correct Answer: C

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Question 25

A 1.00 L flask contains 0.500 mol of a gas at 298 K. If the gas is heated to 373 K and compressed to 0.500 L, what is the new pressure of the gas?

A. 4.00 x 10^5 Pa

B. 5.00 x 10^5 Pa

Correct C. 6.00 x 10^5 Pa

D. 7.00 x 10^5 Pa

Correct Answer: C

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