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POST UTME AAUA 2022 Chemistry | Objective

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Question 1

Determine the number of moles of H2O produced in the electrolysis of 2.5 L of H2SO4 at 25°C, given that the cell potential is 2.0 V and the current is 5.0 A.

A. 0.25 mol

B. 0.50 mol

Correct C. 1.00 mol

D. 1.25 mol

Correct Answer: C

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Question 2

A 2.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the pH of the resulting solution?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 3

A sample of CO2 is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of CO2 in the sample?

A. 0.5 atm

B. 0.75 atm

Correct C. 1.0 atm

D. 1.25 atm

Correct Answer: C

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Question 4

A 1.0 M solution of H2SO4 is electrolyzed at a cons\tant current of 5.0 A. What is the mass of H2 produced at the cathode after 2.0 hours?

A. 0.25 g

B. 0.50 g

Correct C. 1.00 g

D. 1.25 g

Correct Answer: C

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Question 5

A 2.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the concentration of the resulting solution?

A. 1.0 M

B. 1.5 M

Correct C. 2.0 M

D. 2.5 M

Correct Answer: C

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Question 6

A sample of an ideal gas is heated at cons\tant volume. Which of the following statements is true about the change in entropy of the gas?

A. The entropy of the gas increases.

B. The entropy of the gas decreases.

Correct C. The entropy of the gas remains cons\tant.

D. The entropy of the gas becomes undefined.

Correct Answer: C

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Question 7

A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of the solution in mol/L?

Correct A. 0.1 M

B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: A

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Question 8

A diagram of a titration setup is shown below. What is the purpose of the burette in the 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 9

A sample of a gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of the gas?

A. 0.9 atm

B. 0.95 atm

Correct C. 1.0 atm

D. 1.05 atm

Correct Answer: C

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Question 10

A diagram of a cell is shown below. What is the function of the mitochondria in the cell?

Correct A. To generate energy for the cell.

B. To synthesize proteins for the cell.

C. To store genetic information for the cell.

D. To regulate the cell's environment.

Correct Answer: A

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Question 11

The electronegativity of an element is a measure of its ability to attract electrons in a covalent bond. Which of the following elements has the highest electronegativity among the given options?

Correct A. Fluorine (F)

B. Chlorine (Cl)

C. Bromine (Br)

D. Iodine (I)

Correct Answer: A

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Question 12

A 2.5 M solution of NaOH is prepared by dissolving 12.5 g of NaOH in water to make 1 L of solution. What is the molarity of the solution?

A. 2.0 M

Correct B. 2.5 M

C. 3.0 M

D. 3.5 M

Correct Answer: B

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Question 13

A metal M reacts with chlorine gas to form a white solid product. The reaction is as follows: M + Cl2 → MCl2. If 2.5 g of M reacts with 1.5 g of Cl2, what is the molar mass of M?

A. 50 g/mol

B. 60 g/mol

Correct C. 70 g/mol

D. 80 g/mol

Correct Answer: C

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Question 14

The s\tandard enthalpy of formation of CO2 is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO?

Correct A. -110.5 kJ/mol

B. -120.5 kJ/mol

C. -130.5 kJ/mol

D. -140.5 kJ/mol

Correct Answer: A

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Question 15

A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in water to make 1 L of solution. What is the molarity of the solution?

Correct A. 1.0 M

B. 1.5 M

C. 2.0 M

D. 2.5 M

Correct Answer: A

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Question 16

The entropy change (ΔS) for the reaction 2NO(g) + O2(g) → 2NO2(g) is -123 J/K. If the reaction is carried out at 298 K, what is the change in Gibbs free energy (ΔG) at equilibrium?

Correct A. -30.0 kJ

B. -20.0 kJ

C. -10.0 kJ

D. 10.0 kJ

Correct Answer: A

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Question 17

A 0.500 M solution of NaOH is titrated with 0.500 M HCl. If 25.0 mL of HCl is required to reach the equivalence point, what is the pH of the resulting solution?

A. 2.00

Correct B. 3.00

C. 4.00

D. 5.00

Correct Answer: B

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Question 18

The s\tandard enthalpy of formation (ΔHf) for CO2(g) is -393.5 kJ/mol. If 2.50 mol of CO2 is produced at 298 K, what is the total enthalpy change (ΔH) for the reaction?

Correct A. -983.75 kJ

B. -983.50 kJ

C. -983.25 kJ

D. -983.00 kJ

Correct Answer: A

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Question 19

A 1.00 M solution of HCl is titrated with 1.00 M NaOH. If 20.0 mL of NaOH is required to reach the equivalence point, what is the concentration of the resulting solution?

A. 0.500 M

B. 0.750 M

Correct C. 1.00 M

D. 1.25 M

Correct Answer: C

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Question 20

The s\tandard entropy of formation (ΔSf) for CO2(g) is -213.8 J/mol·K. If 2.50 mol of CO2 is produced at 298 K, what is the total entropy change (ΔS) for the reaction?

Correct A. -536.5 J/K

B. -536.0 J/K

C. -535.5 J/K

D. -535.0 J/K

Correct Answer: A

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Question 21

A 0.500 M solution of NaOH is titrated with 0.500 M HCl. If 25.0 mL of HCl is required to reach the equivalence point, what is the pH of the resulting solution?

A. 2.00

Correct B. 3.00

C. 4.00

D. 5.00

Correct Answer: B

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Question 22

The s\tandard enthalpy of formation (ΔHf) for CO2(g) is -393.5 kJ/mol. If 2.50 mol of CO2 is produced at 298 K, what is the total enthalpy change (ΔH) for the reaction?

Correct A. -983.75 kJ

B. -983.50 kJ

C. -983.25 kJ

D. -983.00 kJ

Correct Answer: A

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Question 23

A 1.00 M solution of HCl is titrated with 1.00 M NaOH. If 20.0 mL of NaOH is required to reach the equivalence point, what is the concentration of the resulting solution?

A. 0.500 M

B. 0.750 M

Correct C. 1.00 M

D. 1.25 M

Correct Answer: C

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Question 24

The s\tandard entropy of formation (ΔSf) for CO2(g) is -213.8 J/mol·K. If 2.50 mol of CO2 is produced at 298 K, what is the total entropy change (ΔS) for the reaction?

A. -536.5 J/K

B. -536.0 J/K

C. -535.5 J/K

D. -535.0 J/K

Correct Answer: VIEW ANSWER

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Question 25

The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?

A. 1,2-dibromocyclohexane

Correct B. 1,4-dibromocyclohexane

C. cis-1,2-dibromocyclohexane

D. trans-1,4-dibromocyclohexane

Correct Answer: B

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