POST UTME BSU 2019 Chemistry | Objective

Are you preparing for POST UTME BSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
Determine the s\tandard Gibbs free energy change for the reaction: 2Ag+(aq) + 2Cl-(aq) → Ag2Cl2(s) at 298 K and 1 atm.
Correct A. -1.38 × 10^5 J/mol
B. -1.38 × 10^6 J/mol
C. -1.38 × 10^3 J/mol
D. -1.38 × 10^2 J/mol

Correct Answer: A

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Question 2
A 2.50 L flask contains 0.150 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
Correct A. 1.01 × 10^5 Pa
B. 2.01 × 10^5 Pa
C. 3.01 × 10^5 Pa
D. 4.01 × 10^5 Pa

Correct Answer: A

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Question 3
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the reaction is complete.
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 4
A 50.0 mL sample of 0.100 M H2SO4 is titrated with 0.100 M NaOH. Calculate the pH of the solution after the reaction is complete.
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 5
A 100.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the reaction is complete.
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 6
Determine the molar solubility of AgCl in a saturated solution at 25°C, given that the solubility product cons\tant (Ksp) is 1.8 × 10^\( -10 \) and the density of the solution is 1.00 g/mL.
A. 1.0 × 10^\( -5 \) M
Correct B. 1.5 × 10^\( -5 \) M
C. 2.0 × 10^\( -5 \) M
D. 3.0 × 10^\( -5 \) M

Correct Answer: B

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Question 7
A 2.50 M solution of HCl is electrolyzed u\sing a platinum electrode. Calculate the mass of Cl2 gas produced at the anode after 2.00 hours, given that the current is 5.00 A and the cell potential is 2.00 V.
A. 0.250 g
B. 0.500 g
Correct C. 1.00 g
D. 1.50 g

Correct Answer: C

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Question 8
A 1.00 L sample of a hydrocarbon mixture contains 0.500 g of n-pen\tane (C5H12) and 0.750 g of isopen\tane (C5H12). Calculate the mole \fraction of n-pen\tane in the mixture.
A. 0.400
Correct B. 0.500
C. 0.600
D. 0.700

Correct Answer: B

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Question 9
A 2.00 M solution of H2SO4 is electrolyzed u\sing a platinum electrode. Calculate the mass of O2 gas produced at the anode after 1.50 hours, given that the current is 3.00 A and the cell potential is 2.50 V.
A. 0.150 g
B. 0.300 g
Correct C. 0.450 g
D. 0.600 g

Correct Answer: C

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Question 10
A 1.00 L sample of a mixture of N2 and O2 contains 0.500 g of N2 and 0.750 g of O2. Calculate the mole \fraction of N2 in the mixture.
A. 0.400
Correct B. 0.500
C. 0.600
D. 0.700

Correct Answer: B

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Question 11
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
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 12
A 0.500 M solution of HCl(aq) is titrated with a 0.500 M solution of NaOH(aq). What is the pH of the solution after 25.0 mL of NaOH(aq) has been added?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 13
The half-life of a radioactive subs\tance is 5.00 days. If 100.0 mg of the subs\tance is initially present, how much of the subs\tance will remain after 20.0 days?
Correct A. 12.5 mg
B. 25.0 mg
C. 50.0 mg
D. 100.0 mg

Correct Answer: A

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Question 14
A 2.00 M solution of NaOH(aq) is titrated with a 1.00 M solution of HCl(aq). What is the pH of the solution after 50.0 mL of HCl(aq) has been added?
A. 1.00
B. 2.00
Correct C. 3.00
D. 4.00

Correct Answer: C

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Question 15
A 1.00 M solution of HCl(aq) is titrated with a 1.00 M solution of NaOH(aq). What is the pH of the solution after 25.0 mL of NaOH(aq) has been added?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 16
A 0.500 M solution of HCl(aq) is titrated with a 0.500 M solution of NaOH(aq). What is the pH of the solution after 50.0 mL of NaOH(aq) has been added?
A. 1.00
B. 2.00
C. 3.00
Correct D. 4.00

Correct Answer: D

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Question 17
A 1.00 M solution of HCl(aq) is titrated with a 1.00 M solution of NaOH(aq). What is the pH of the solution after 50.0 mL of NaOH(aq) has been added?
A. 1.00
B. 2.00
Correct C. 3.00
D. 4.00

Correct Answer: C

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Question 18
A 0.500 M solution of HCl(aq) is titrated with a 0.500 M solution of NaOH(aq). What is the pH of the solution after 25.0 mL of NaOH(aq) has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00

Correct Answer: VIEW ANSWER

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Question 19
Determine the number of moles of ΔH2O produced when 2.50 g of H2SO4 reacts with an excess of NaOH according to the equation: H2SO4 + 2NaOH → ΔH2O + Na2SO4. The molar mass of H2SO4 is 98.08 g/mol.
A. 0.0250 mol
Correct B. 0.0500 mol
C. 0.100 mol
D. 0.200 mol

Correct Answer: B

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Question 20
A 0.500 M solution of HCl is mixed with a 0.500 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 21
The half-life of a radioactive subs\tance is 5.00 days. If 100.0 mg of the subs\tance initially exists, how much will remain after 20.0 days?
A. 50.0 mg
B. 25.0 mg
C. 12.5 mg
Correct D. 6.25 mg

Correct Answer: D

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Question 22
A 2.00 M solution of H2SO4 is mixed with a 2.00 M solution of NaOH. What is the resulting pH?
A. 1.00
B. 2.00
Correct C. 3.00
D. 4.00

Correct Answer: C

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Question 23
A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. What is the resulting pH?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 24
A sample of nitrogen gas at 25°C and 1 atm is heated to 50°C. What is the new volume of the gas, assuming ideal behavior?
A. 2.00 L
B. 1.50 L
Correct C. 1.00 L
D. 0.50 L

Correct Answer: C

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Question 25
A 2.50 M solution of sulfuric acid (H2SO4) is mixed with a 1.00 M solution of sodium hydroxide (NaOH). What is the resulting concentration of the acid?
Correct A. 1.25 M
B. 2.00 M
C. 2.50 M
D. 3.75 M

Correct Answer: A

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