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POST UTME COAL CITY UNIVERSITY 2023 Chemistry | Objective

Are you preparing for POST UTME COAL CITY UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

In a reaction between a hydrocarbon and oxygen, the products are carbon dioxide and water. If the reaction is carried out at cons\tant pressure, what is the change in entropy?

A. ΔS = 0

Correct B. ΔS > 0

C. ΔS < 0

D. ΔS is not defined

Correct Answer: B

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Question 2

A solution of 2.0 g of NaCl in 100 mL of water has a boiling point elevation of 0.50°C. What is the molality of the solution?

A. 0.10 m

Correct B. 0.20 m

C. 0.30 m

D. 0.40 m

Correct Answer: B

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Question 3

A mixture of 2.0 g of glu\cose and 1.0 g of fructose is dissolved in 100 mL of water. What is the osmotic pressure of the solution at 25°C?

A. 0.50 atm

Correct B. 1.0 atm

C. 1.5 atm

D. 2.0 atm

Correct Answer: B

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Question 4

A solution of 1.0 M HCl is mixed with a solution of 1.0 M NaOH. 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 5

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

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 measure the pH of the solution

Correct Answer: A

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Question 6

Determine the molar mass of nitrogen gas (N2) u\sing the following data: atomic mass of nitrogen = 14.01 g/mol. The molar volume of an ideal gas at STP is 22.4 L/mol.

Correct A. 28.02 g/mol

B. 22.4 g/mol

C. 14.01 g/mol

D. 6.02 x 10^23 mol^-1

Correct Answer: A

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Question 7

A 2.5 L flask contains 0.25 mol of an ideal gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.

A. 1.01 x 10^5 Pa

Correct B. 2.46 x 10^5 Pa

C. 3.01 x 10^5 Pa

D. 4.01 x 10^5 Pa

Correct Answer: B

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Question 8

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) u\sing Hess's law.

Correct A. -110.5 kJ/mol

B. -110.5 kJ/mol

C. -110.5 kJ/mol

D. -110.5 kJ/mol

Correct Answer: A

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Question 9

A catalyst is added to a reaction mixture. Which of the following statements is true?

Correct A. The reaction rate increases.

B. The reaction rate decreases.

C. The reaction equilibrium shifts to the left.

D. The reaction equilibrium shifts to the right.

Correct Answer: A

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Question 10

A solution contains 0.1 M NaCl. Calculate the concentration of Cl- ions.

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

The rate cons\tant (k) of a first-order reaction is given by the equation: k = 2.303/t \log10\( A0/A \)

A. t = 2.303/k \log10\( A0/A \)

B. k = 2.303/t \log10\( A/A0 \)

C. A = A0 e^\( -kt \)

Correct D. k = 2.303/t \log10\( A0/A \)

Correct Answer: D

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Question 12

A sample of nitrogen gas (N2) is collected over water at a temperature of 298 K and a pressure of 1 atm. If the vapor pressure of water at this temperature is 0.0313 atm, calculate the partial pressure of N2 in the sample.

Correct A. 0.9687 atm

B. 0.0313 atm

C. 1 atm

D. 0.9687 atm

Correct Answer: A

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Question 13

A solution contains 0.1 M NaCl. If 10 mL of this solution is diluted to 100 mL, what is the new concentration of NaCl?

Correct A. 0.01 M

B. 0.1 M

C. 0.01 M

D. 0.001 M

Correct Answer: A

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Question 14

A 2.5 L flask contains 0.5 g of CO2 at 298 K. If the flask is connected to a 1 atm pressure gauge, what is the partial pressure of CO2 in the flask?

A. 0.5 atm

Correct B. 0.25 atm

C. 0.25 atm

D. 0.5 atm

Correct Answer: B

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Question 15

A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50 mL of each solution is used, what is the pH of the resulting solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 16

A 0.1 M solution of CaCl2 is mixed with a 0.1 M solution of Na2SO4. If 50 mL of each solution is used, what is the molarity of the resulting solution?

A. 0.1 M

Correct B. 0.05 M

C. 0.05 M

D. 0.01 M

Correct Answer: B

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Question 17

A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50 mL of each solution is used, what is the concentration of the resulting solution?

Correct A. 0.5 M

B. 1.0 M

C. 1.5 M

D. 2.0 M

Correct Answer: A

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Question 18

A 0.1 M solution of CaCl2 is mixed with a 0.1 M solution of Na2SO4. If 50 mL of each solution is used, what is the concentration of the resulting 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 19

A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If 50 mL of each solution is used, what is the pH of the resulting solution?

A. 1

B. 2

C. 3

D. 4

Correct Answer: VIEW ANSWER

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Question 20

The reaction of magnesium metal with hydrochloric acid produces magnesium chloride and hydrogen gas. Write the balanced chemical equation for this reaction.

A. \text{Mg}(s) + \text{HCl}(aq) \rightarrow \text{MgCl}(aq) + \text{H}_2(g)

Correct B. \text{Mg}(s) + 2\text{HCl}(aq) \rightarrow \text{MgCl}_2(aq) + \text{H}_2(g)

C. \text{Mg}(s) + \text{HCl}(aq) \rightarrow \text{MgCl}_2(aq) + \text{H}_2(g)

D. \text{Mg}(s) + \text{H}_2\text{O}(l) \rightarrow \text{MgCl}_2(aq) + \text{H}_2(g)

Correct Answer: B

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Question 21

The s\tandard enthalpy of formation of carbon dioxide is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of carbon monoxide?

Correct A. -283.5\text{ kJ/mol}

B. -393.5\text{ kJ/mol}

C. -493.5\text{ kJ/mol}

D. -593.5\text{ kJ/mol}

Correct Answer: A

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Question 22

A 2.5 g sample of a polymer is dissolved in 50 mL of a solvent. The solution is then titrated with a 0.1 M solution of a strong acid. The equivalence point is reached when 25 mL of the acid has been added. What is the molar mass of the polymer?

A. 5000\text{ g/mol}

Correct B. 6000\text{ g/mol}

C. 7000\text{ g/mol}

D. 8000\text{ g/mol}

Correct Answer: B

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Question 23

The diagram below shows a titration setup.

Correct A. The solution in beaker A is a strong acid.

B. The solution in beaker A is a weak acid.

C. The solution in beaker A is a strong base.

D. The solution in beaker A is a weak base.

Correct Answer: A

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Question 24

The s\tandard enthalpy of formation of water is -285.8 kJ/mol. What is the s\tandard enthalpy of formation of hydrogen gas?

Correct A. -185.8\text{ kJ/mol}

B. -285.8\text{ kJ/mol}

C. -385.8\text{ kJ/mol}

D. -485.8\text{ kJ/mol}

Correct Answer: A

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Question 25

A 1.0 M solution of a strong acid is titrated with a 0.5 M solution of a strong base. The initial pH of the acid is 2.0. What is the pH of the solution at the equivalence point?

A. 7.0

Correct B. 8.0

C. 9.0

D. 10.0

Correct Answer: B

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