POST UTME OSUSTECH 2023 Chemistry | Objective

Are you preparing for POST UTME OSUSTECH 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.

Practice these randomly selected questions to test your readiness.

Question 1
Determine the number of moles of oxygen gas (O2) produced at s\tandard temperature and pressure (STP) from the complete combustion of 2.50 g of glu\cose (C6H12O6).
A. 0.125 mol
Correct B. 0.250 mol
C. 0.500 mol
D. 1.00 mol

Correct Answer: B

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Question 2
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.0500 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.00250 mol
Correct B. 0.00500 mol
C. 0.00750 mol
D. 0.0100 mol

Correct Answer: B

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Question 3
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is titrated with 0.0500 M HCl, what is the pH of the resulting solution at the equivalence point?
A. 7.00
B. 8.00
Correct C. 9.00
D. 10.0

Correct Answer: C

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Question 4
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.0500 M HCl. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.00250 mol
Correct B. 0.00500 mol
C. 0.00750 mol
D. 0.0100 mol

Correct Answer: B

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Question 5
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is titrated with 0.0500 M HCl, what is the volume of HCl required to reach the equivalence point?
A. 50.0 mL
Correct B. 75.0 mL
C. 100 mL
D. 125 mL

Correct Answer: B

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Question 6
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH in a 1:1 ratio. What is the resulting pH of the solution?
A. 7
B. 10
C. 14
Correct D. pH 7

Correct Answer: D

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Question 7
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
Correct B. 0.75 atm
C. 1 atm
D. 1.5 atm

Correct Answer: B

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Question 8
A 2.0 g sample of a polymer is dissolved in 100 mL of a solvent. What is the molar mass of the polymer if the osmotic pressure of the solution is 2.5 atm at 25°C?
A. 1000 g/mol
B. 2000 g/mol
Correct C. 5000 g/mol
D. 10000 g/mol

Correct Answer: C

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Question 9
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH in a 1:1 ratio. What is the resulting pH of the solution?
A. 7
B. 10
C. 14
Correct D. pH 7

Correct Answer: D

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Question 10
A sample of N2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of N2 in the sample?
A. 0.5 atm
B. 0.75 atm
Correct C. 1 atm
D. 1.5 atm

Correct Answer: C

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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 combustion of 1 mol of C(s) to form CO2(g).
Correct A. -393.5 kJ/mol
B. -393.5 kJ/mol + 1 kJ/mol
C. -393.5 kJ/mol - 1 kJ/mol
D. -393.5 kJ/mol + 2 kJ/mol

Correct Answer: A

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Question 12
A solution of 0.1 M NaCl is electrolyzed u\sing a platinum electrode. Calculate the mass of Cl2(g) collected at the anode after 2 hours.
A. 1.2 g
Correct B. 2.4 g
C. 3.6 g
D. 4.8 g

Correct Answer: B

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Question 13
The s\tandard enthalpy of formation of C6H12O6(s) is -1273.3 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mol of C6H12O6(s) to form CO2(g) and H2O(l).
Correct A. -1273.3 kJ/mol
B. -1273.3 kJ/mol + 1 kJ/mol
C. -1273.3 kJ/mol - 1 kJ/mol
D. -1273.3 kJ/mol + 2 kJ/mol

Correct Answer: A

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Question 14
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 10 mL of HCl has been added.
A. 1
B. 2
Correct C. 3
D. 4

Correct Answer: C

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Question 15
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of vaporization of 1 mol of H2O(l) to form H2O(g).
Correct A. 40.7 kJ/mol
B. 41.7 kJ/mol
C. 42.7 kJ/mol
D. 43.7 kJ/mol

Correct Answer: A

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