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POST UTME AFE BABALOLA UNIVERSITY 2022 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 2022 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the number of moles of $\mathrm{CaCO_3}$ that can be obtained from 0.250 mol of $\mathrm{Ca(OH)_2}$ in a reaction where $\mathrm{CaCO_3}$ is produced.

A. 0.250 mol

Correct B. 0.500 mol

C. 0.750 mol

D. 1.000 mol

Correct Answer: B

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Question 2

A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M $\mathrm{HCl}$ is added to 25.0 mL of 0.100 M $\mathrm{NaOH}$, what is the pH of the resulting solution?

A. 7.00

Correct B. 8.00

C. 9.00

D. 10.0

Correct Answer: B

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Question 3

The diagram below shows a cross-section of a plant cell. Identify the part labeled A.

Correct A. Mitochondria

B. Chloroplast

C. Vacuole

D. Nucleus

Correct Answer: A

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Question 4

A diagram of a circuit is shown below. If the voltage of the battery is 12.0 V and the resis\tance of the circuit is 4.00 Ω, what is the current flowing through the circuit?

A. 1.50 A

Correct B. 2.00 A

C. 3.00 A

D. 4.00 A

Correct Answer: B

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Question 5

The diagram below shows a graph of the concentration of a solution versus time. What is the rate of change of the concentration at t = 10.0 min?

A. 0.100 M/min

Correct B. 0.200 M/min

C. 0.300 M/min

D. 0.400 M/min

Correct Answer: B

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Question 6

A sample of a gas at 25°C and 1 atm is compressed to half its original volume. What is the new pressure, in atm, if the gas behaves ideally?

A. 2 atm

B. 1 atm

Correct C. 0.5 atm

D. 4 atm

Correct Answer: C

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Question 7

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

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 8

A mixture of 2.0 g of NaCl and 1.0 g of KNO3 is dissolved in 100 mL of water. What is the molarity of the solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: B

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Question 9

A sample of a non-metallic element has a mass of 2.5 g and a volume of 1.0 mL. What is the density of the element in g/mL?

Correct A. 2.5 g/mL

B. 2.0 g/mL

C. 1.5 g/mL

D. 1.0 g/mL

Correct Answer: A

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Question 10

A solution of 0.1 M H2SO4 is titrated with 0.1 M NaOH. What is the pH of the solution after 50 mL of NaOH has been added?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 11

The reaction between sodium hydroxide and acetic acid is a classic example of a reaction that can be classified as a type of reaction. What type of reaction is this?

Correct A. Neutralization reaction

B. Oxidation-reduction reaction

C. Acid-base reaction

D. Combustion reaction

Correct Answer: A

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Question 12

A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 13

The reaction of hydrogen gas with chlorine gas to form hydrogen chloride gas is an example of a reaction. What type of reaction is this?

A. Combustion reaction

B. Oxidation-reduction reaction

Correct C. Synthesis reaction

D. Decomposition reaction

Correct Answer: C

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Question 14

A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the concentration of the resulting solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: B

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Question 15

The reaction of sodium metal with water to form sodium hydroxide and hydrogen gas is an example of a reaction. What type of reaction is this?

A. Neutralization reaction

Correct B. Oxidation-reduction reaction

C. Synthesis reaction

D. Decomposition reaction

Correct Answer: B

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Question 16

A polymer is formed by the condensation reaction of two monomers, A and B, with the general equation: A + B → AB. If the molecular weight of A is 100 g/mol and the molecular weight of B is 150 g/mol, what is the average molecular weight of the polymer AB?

A. 120 g/mol

Correct B. 125 g/mol

C. 130 g/mol

D. 140 g/mol

Correct Answer: B

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Question 17

A 0.1 M solution of HCl is titrated with a 0.1 M solution of NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?

A. 6

Correct B. 7

C. 8

D. 9

Correct Answer: B

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Question 18

A sample of air contains 20% O2, 70% N2, and 10% CO2 by volume. If the total pressure of the air is 1 atm, what is the partial pressure of CO2?

A. 0.05 atm

Correct B. 0.1 atm

C. 0.15 atm

D. 0.2 atm

Correct Answer: B

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Question 19

A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH. If 20 mL of H2SO4 is added to 20 mL of NaOH, what is the resulting pH?

A. 0

Correct B. 1

C. 2

D. 3

Correct Answer: B

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Question 20

A 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. If 10 mL of HCl is required to reach the equivalence point, what is the resulting pH?

A. 6

Correct B. 7

C. 8

D. 9

Correct Answer: B

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Question 21

The reaction between sodium (Na) and chlorine (Cl2) to form sodium chloride (NaCl) is an example of a ______ reaction.

A. synthesis

B. decomposition

Correct C. replacement

D. combustion

Correct Answer: C

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Question 22

The rate cons\tant (k) of a first-order reaction is related to the half-life $ t1/2 $ by the equation: k = ln(2) / t1/2. If the half-life of a first-order reaction is 10 minutes, what is the value of k?

Correct A. 0.0693 min^-1

B. 0.693 min^-1

C. 6.93 min^-1

D. 69.3 min^-1

Correct Answer: A

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Question 23

The diagram below shows a titration setup. What is the purpose of the burette in this setup?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To separate the titrant and analyte

Correct Answer: A

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Question 24

The polymer polyethylene (C2H4)n is a type of ______ polymer.

A. elastomer

Correct B. thermoplastic

C. thermosetting

D. fibers

Correct Answer: B

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Question 25

The equilibrium cons\tant (Kc) for the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g) is 0.05. If the concentrations of N2 and H2 are 0.1 M and 0.3 M respectively, what is the concentration of NH3?

Correct A. 0.02 M

B. 0.04 M

C. 0.06 M

D. 0.08 M

Correct Answer: A

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