POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2022 Chemistry | Objective

Are you preparing for POST UTME JOSEPH AYO 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
A 2.50-g sample of a polymer is dissolved in 250 mL of a solvent. If the density of the solution is 1.05 g/mL, what is the molar mass of the polymer?
A. 10,000 g/mol
B. 20,000 g/mol
Correct C. 30,000 g/mol
D. 40,000 g/mol

Correct Answer: C

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Question 2
A 1.00 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in 1.00 L of water. What is the molarity of the solution?
A. 0.50 M
Correct B. 1.00 M
C. 1.50 M
D. 2.00 M

Correct Answer: B

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Question 3
A 2.00-g sample of a subs\tance is dissolved in 100.0 mL of water. If the density of the solution is 1.20 g/mL, what is the molar mass of the subs\tance?
A. 20,000 g/mol
B. 30,000 g/mol
Correct C. 40,000 g/mol
D. 50,000 g/mol

Correct Answer: C

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Question 4
A 1.00 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1.00 L of water. What is the molarity of the solution?
A. 0.50 M
Correct B. 1.00 M
C. 1.50 M
D. 2.00 M

Correct Answer: B

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Question 5
A 2.00-g sample of a subs\tance is dissolved in 100.0 mL of water. If the density of the solution is 1.20 g/mL, what is the molar mass of the subs\tance?
A. 20,000 g/mol
B. 30,000 g/mol
Correct C. 40,000 g/mol
D. 50,000 g/mol

Correct Answer: C

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Question 6
The reaction between ethene and bromine in the presence of light produces 1,2-dibromoethane. Write the equation for this reaction, including the state of matter for each reac\tant and product.
A. C2H4 + Br2 → C2H4Br2
B. C2H4 + Br2 → C2H5Br
C. C2H4 + Br2 → C2H4Br
Correct D. C2H4 + Br2 → C2H4Br2

Correct Answer: D

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Question 7
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 12.5 mL
Correct B. 25.0 mL
C. 37.5 mL
D. 50.0 mL

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 C2H4(g) from the following equation: C(s) + 2H2(g) → C2H4(g).
Correct A. -137.3 kJ/mol
B. -52.3 kJ/mol
C. -22.3 kJ/mol
D. 22.3 kJ/mol

Correct Answer: A

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Question 9
A 2.50 g sample of a polymer is dissolved in 100.0 mL of solvent. The solution is then titrated with 0.100 M NaOH. Calculate the number-average molecular weight of the polymer.
A. 10,000 g/mol
Correct B. 20,000 g/mol
C. 30,000 g/mol
D. 40,000 g/mol

Correct Answer: B

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Question 10
The half-life of a first-order reaction is 10.0 min. Calculate the rate cons\tant (k) for the reaction.
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 11
Determine the number of moles of $\text{O}_2$ produced when 2.50 g of $\text{KClO}_3$ is decomposed completely according to the equation: $\text{2KClO}_3(s) \rightarrow \text{2KCl}(s) + 3\text{O}_2(g)$
A. 0.0500 mol
Correct B. 0.100 mol
C. 0.150 mol
D. 0.200 mol

Correct Answer: B

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Question 12
A 0.500 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 torr, what is the partial pressure of the gas?
A. 0.976 atm
Correct B. 0.987 atm
C. 0.998 atm
D. 1.00 atm

Correct Answer: B

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Question 13
A 2.50 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 torr, what is the partial pressure of the gas?
A. 0.976 atm
Correct B. 0.987 atm
C. 0.998 atm
D. 1.00 atm

Correct Answer: B

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Question 14
A 0.500 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 torr, what is the partial pressure of the gas?
A. 0.976 atm
Correct B. 0.987 atm
C. 0.998 atm
D. 1.00 atm

Correct Answer: B

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Question 15
A 2.50 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 torr, what is the partial pressure of the gas?
A. 0.976 atm
Correct B. 0.987 atm
C. 0.998 atm
D. 1.00 atm

Correct Answer: B

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Question 16
Calculate the s\tandard enthalpy change (ΔH°) for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). Given that the s\tandard enthalpy of formation (ΔHf°) for Al2O3(s) is -1675.7 kJ/mol, and the s\tandard enthalpy of formation for Fe2O3(s) is -824.2 kJ/mol.
A. -1451.9 kJ/mol
B. -1675.7 kJ/mol
C. -824.2 kJ/mol
Correct D. -1451.9 kJ/mol + 1675.7 kJ/mol

Correct Answer: D

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Question 17
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 atm
B. 2.01 atm
C. 3.01 atm
D. 4.01 atm

Correct Answer: A

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Question 18
The s\tandard enthalpy of combustion (ΔHc°) for glu\cose (C6H12O6) is -2802.2 kJ/mol. Calculate the s\tandard enthalpy of formation (ΔHf°) for glu\cose.
A. -2802.2 kJ/mol
B. -2802.2 kJ/mol + 6ΔHf°(C)
C. -2802.2 kJ/mol + 12ΔHf°(H)
Correct D. -2802.2 kJ/mol + 6ΔHf°(C) + 12ΔHf°(H)

Correct Answer: D

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Question 19
A 0.500 L flask contains 0.250 mol of an ideal gas at 298 K. Calculate the number of moles of gas present in a 2.00 L flask at the same temperature.
A. 0.500 mol
Correct B. 0.750 mol
C. 1.00 mol
D. 1.25 mol

Correct Answer: B

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Question 20
The s\tandard enthalpy of formation (ΔHf°) for water (H2O) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of combustion (ΔHc°) for water.
A. -285.8 kJ/mol
B. -285.8 kJ/mol + 2ΔHf°(H)
C. -285.8 kJ/mol + ΔHf°(O)
Correct D. -285.8 kJ/mol + 2ΔHf°(H) + ΔHf°(O)

Correct Answer: D

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Question 21
Determine the number of moles of $CO_2$ produced when 2.5 g of $CaC_2$ is completely decomposed at cons\tant pressure and temperature.
A. 0.125 mol
Correct B. 0.25 mol
C. 0.5 mol
D. 1.0 mol

Correct Answer: B

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Question 22
A 2.5 M solution of $HCl$ is titrated with 0.5 M $NaOH$. Calculate the pH of the solution after 25 mL of $NaOH$ has been added.
A. 2
B. 3
Correct C. 4
D. 5

Correct Answer: C

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Question 23
A sample of $CO_2$ gas occupies a volume of 2.5 L at a pressure of 1 atm and a temperature of 298 K. Calculate the number of moles of $CO_2$ present.
A. 0.25 mol
Correct B. 0.5 mol
C. 0.75 mol
D. 1.0 mol

Correct Answer: B

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Question 24
A 1.0 M solution of $H_2SO_4$ is titrated with 0.5 M $NaOH$. Calculate the pH of the solution after 50 mL of $NaOH$ has been added.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 25
A sample of $O_2$ gas occupies a volume of 3.0 L at a pressure of 2 atm and a temperature of 300 K. Calculate the number of moles of $O_2$ present.
A. 0.5 mol
Correct B. 1.0 mol
C. 1.5 mol
D. 2.0 mol

Correct Answer: B

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