POST UTME OAU 2018 Chemistry | Objective

Are you preparing for POST UTME OAU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol. Assume the reaction is: CaO(s) + CO2(g) → CaCO3(s).
Correct A. -1781.6 kJ/mol
B. -1781.6 kJ/mol
C. -1781.6 kJ/mol
D. -1781.6 kJ/mol

Correct Answer: A

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Question 2
A 2.50 L flask contains 0.250 mol of an ideal gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.
Correct A. 1.01 × 10^5 Pa
B. 1.01 × 10^5 Pa
C. 1.01 × 10^5 Pa
D. 1.01 × 10^5 Pa

Correct Answer: A

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Question 3
A 0.500 L solution of NaCl contains 0.100 mol of NaCl. What is the molarity of the solution?
Correct A. 0.200 M
B. 0.200 M
C. 0.200 M
D. 0.200 M

Correct Answer: A

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Question 4
A 2.50 L flask contains 0.250 mol of an ideal gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.
Correct A. 1.01 × 10^5 Pa
B. 1.01 × 10^5 Pa
C. 1.01 × 10^5 Pa
D. 1.01 × 10^5 Pa

Correct Answer: A

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Question 5
A 0.500 L solution of NaCl contains 0.100 mol of NaCl. What is the molarity of the solution?
Correct A. 0.200 M
B. 0.200 M
C. 0.200 M
D. 0.200 M

Correct Answer: A

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Question 6
Determine the pH of a 0.1 M solution of HCl.
Correct A. 1
B. 2
C. 3
D. 4

Correct Answer: A

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Question 7
Calculate the molarity of a solution containing 25 g of NaOH in 250 mL of solution.
A. 0.1 M
B. 0.5 M
Correct C. 1 M
D. 2 M

Correct Answer: C

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Question 8
A 2.5 L flask contains 0.5 M H2SO4. Calculate the number of moles of H2SO4 present.
A. 0.5 mol
Correct B. 1 mol
C. 2 mol
D. 5 mol

Correct Answer: B

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Question 9
A solution contains 0.2 M CaCl2. What is the concentration of Ca2+ ions?
A. 0.1 M
Correct B. 0.2 M
C. 0.4 M
D. 0.8 M

Correct Answer: B

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Question 10
A 100 mL sample of 0.5 M HCl is titrated with 0.5 M NaOH. Calculate the pH of the solution after the titration.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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