POST UTME MOUNTAIN TOP UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To filter the solution
Question 2
A 10 g sample of a subs\tance is found to have a mass of 5 g after being placed in a beaker and heated to 100°C. Calculate the mass of water lost by the subs\tance.
A. 2 g
B. 5 g
C. 8 g
D. 10 g
Question 3
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. What is the pressure of the gas?
A. 1.5 atm
B. 2.0 atm
C. 2.5 atm
D. 3.0 atm
Question 4
A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in 1.00 L of water. What is the concentration of OH- ions in the solution?
A. 0.500 M
B. 0.250 M
C. 1.00 M
D. 2.00 M
Question 5
The diagram below shows a titration setup for determining the concentration of a strong acid.
A. HCl
B. H2SO4
C. HNO3
D. H3PO4
Question 6
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 7
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?
A. 7
B. 6
C. 5
D. 4
Question 8
A solution contains 0.1 M NaOH and 0.1 M HCl. What is the concentration of the solution after mixing?
A. 0.1
B. 0.2
C. 0.3
D. 0.4
Question 9
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?
A. 7
B. 6
C. 5
D. 4
Question 10
The rate cons\tant (k) for a first-order reaction is related to the half-life \( t1/2 \) by the equation: k = ln(2) / t1/2. If the half-life of a reaction is 10 minutes, what is the rate cons\tant (k) in min^-1?
A. 0.0693
B. 0.693
C. 6.93
D. 69.3
Question 11
A 25 mL sample of a solution containing 0.5 M H2SO4 is titrated with 1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 25 mL
B. 50 mL
C. 75 mL
D. 100 mL
Question 12
Calculate the molar mass of a compound with the empirical formula C2H4O.
A. 28
B. 40
C. 56
D. 72
Question 13
A solution contains 0.1 M NaOH and 0.1 M HCl. What is the pH of the solution after mixing?
A. 7
B. 6
C. 5
D. 4
Question 14
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 15
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4

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