POST UTME AAUA 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Determine the pH of a 0.1 M solution of HCl after 10 mL of 0.1 M NaOH has been added to 20 mL of the HCl solution. Assume the volume of the resulting solution is 30 mL.
A. 1
B. 2
C. 3
D. 4
Question 2
A 2.5 g sample of a non-metallic element is found to have a mass of 3.75 g after being heated in a crucible. What is the percentage increase in mass?
A. 25%
B. 50%
C. 75%
D. 100%
Question 3
A 1.00 L flask contains 0.500 mol of an ideal gas at 298 K. If the gas is compressed to 0.500 L at cons\tant temperature, what is the new pressure?
A. 2.00 atm
B. 3.00 atm
C. 4.00 atm
D. 5.00 atm
Question 4
The compound SO2 is classified as a(n) _______________________ oxide.
A. dioxide
B. oxide
C. sulfide
D. sulfate
Question 5
The compound SO3 is classified as a(n) _______________________ oxide.
A. trioxide
B. oxide
C. sulfide
D. sulfate
Question 6
A solution contains 0.200 mol of a weak acid (HA) and 0.100 mol of its conjugate base \( A^- \). If the initial pH is 4.00, what is the new pH after the addition of 0.0500 mol of strong base \( OH^- \)?
A. 3.00
B. 4.00
C. 5.00
D. 6.00
Question 7
A 2.5 g sample of a non-metallic element is found to have a mass of 3.75 g after being heated in a crucible. What is the percentage increase in mass?
A. 25%
B. 50%
C. 75%
D. 100%
Question 8
Determine the molar mass of the compound C6H12O6.
A. 180 g/mol
B. 180.16 g/mol
C. 180.2 g/mol
D. 180.24 g/mol
Question 9
A 100 mL sample of a solution containing 0.1 M potassium chloride (KCl) is titrated with 0.1 M silver nitrate (AgNO3). Calculate the volume of AgNO3 required to reach the equivalence point.
A. 50 mL
B. 75 mL
C. 100 mL
D. 125 mL
Question 10
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 2.5 g of NaOH in 100 mL of water. Calculate the concentration of hydroxide ions \( OH- \) in the solution.
A. 0.05 M
B. 0.10 M
C. 0.15 M
D. 0.20 M
Question 11
A 2.5 g sample of a non-metallic element is found to have a mass of 3.75 g after being heated in a crucible. What is the percentage increase in mass?
A. 25%
B. 50%
C. 75%
D. 100%
Question 12
A 10 L \tank contains 5 L of a 2 M solution of NaOH. If 2 L of a 1 M solution of HCl is added to the \tank, what is the concentration of the resulting solution?
A. 1.5 M
B. 2.0 M
C. 2.5 M
D. 3.0 M
Question 13
The atomic radius of an element is 100 pm. If the element is in the 4th period, what is the value of its atomic radius in the 5th period?
A. 125 pm
B. 150 pm
C. 175 pm
D. 200 pm
Question 14
The compound SO3 is classified as a(n) _______________________ oxide.
A. trioxide
B. oxide
C. sulfide
D. sulfate
Question 15
A 2.0 g sample of a metal \( molar mass = 65 g/mol \) is dissolved in 100 mL of nitric acid (HNO3). The resulting solution is then titrated with 0.1 M sodium hydroxide (NaOH). Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.03 mol
B. 0.04 mol
C. 0.05 mol
D. 0.06 mol

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