POST UTME LEAD CITY UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.5 M solution of a weak base, B, is titrated with 0.5 M HCl. If 25 mL of the base is required to neutralize 25 mL of 0.5 M HCl, what is the pH of the solution after the titration?
A. 7.0
B. 7.5
C. 8.0
D. 8.5
Question 2
A 250 mL sample of a 0.100 M solution of FeCl3 is titrated with a 1.00 M solution of NaOH. What is the number of moles of NaOH required to reach the equivalence point?
A. 0.0250 mol
B. 0.0500 mol
C. 0.0750 mol
D. 0.100 mol
Question 3
A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. What is the pH of the resulting solution?
A. 0.00
B. 1.00
C. 2.00
D. 3.00
Question 4
A 2.50 L flask contains 0.250 mol of CO at 298 K. What is the partial pressure of CO in the flask?
A. 0.500 atm
B. 0.750 atm
C. 1.00 atm
D. 1.50 atm
Question 5
A 250 mL sample of a 0.100 M solution of FeCl3 is titrated with a 1.00 M solution of NaOH. What is the number of moles of NaOH required to reach the equivalence point?
A. 0.0250 mol
B. 0.0500 mol
C. 0.0750 mol
D. 0.100 mol
Question 6
A solution contains 0.1 M NaCl and 0.1 M CaCl2. What is the concentration of Cl- ions in the solution?
A. 0.2 M
B. 0.3 M
C. 0.4 M
D. 0.5 M
Question 7
A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 500. What is the molar mass of the monomer?
A. 100 g/mol
B. 50 g/mol
C. 25 g/mol
D. 10 g/mol
Question 8
A 2.0 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 1.2 g, what is the percentage yield of the reaction?
A. 60%
B. 70%
C. 80%
D. 90%
Question 9
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If the initial pH of the acid is 4.5, what is the pH after the addition of 20 mL of NaOH?
A. 4.8
B. 5.0
C. 5.2
D. 5.5
Question 10
A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 200. What is the molar mass of the repeating unit?
A. 250 g/mol
B. 250.5 g/mol
C. 251 g/mol
D. 252 g/mol
Question 11
A solution containing 0.2 M H2SO4 is titrated with 0.1 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 12
A sample of 2.5 g of a metal carbonate is heated to produce 0.75 g of metal oxide. What is the molar mass of the metal?
A. 40
B. 60
C. 80
D. 100
Question 13
A metal M reacts with chlorine gas to form a white solid product. The reaction is as follows: M + Cl2 → MCl2. If 2.5 g of MCl2 is obtained from 1.5 g of M, what is the percentage yield of the reaction?
A. 80%
B. 85%
C. 90%
D. 95%
Question 14
The rate cons\tant (k) of a first-order reaction is given by the equation: ln\( [A]t/[A]0 \) = -kt. If the half-life of the reaction is 10 minutes, what is the value of k?
A. 0.0693 min^-1
B. 0.0693 s^-1
C. 0.693 min^-1
D. 0.693 s^-1
Question 15
A 1.00 L flask contains 0.500 mol of O2 at 298 K. What is the partial pressure of O2 in the flask?
A. 0.500 atm
B. 0.750 atm
C. 1.00 atm
D. 1.50 atm

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