POST UTME LEAD CITY UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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
Question 2
A metal (X) has a molar mass of 80 g/mol and forms a chloride with a molar mass of 168 g/mol. What is the formula of the metal chloride?
A. MCl
B. MCl2
C. MCl3
D. MCl4
Question 3
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 4
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 5
A 2.0 M solution of a weak acid, HA, is titrated with 2.0 M NaOH. If 20 mL of the acid is required to neutralize 20 mL of 2.0 M NaOH, what is the value of Ka for the acid?
A. 1.0 x 10^-5
B. 1.0 x 10^-4
C. 1.0 x 10^-3
D. 1.0 x 10^-2
Question 6
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 value of Kb for the base?
A. 1.0 x 10^-5
B. 1.0 x 10^-4
C. 1.0 x 10^-3
D. 1.0 x 10^-2
Question 7
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 8
A 2.0 L flask contains 0.1 M HCl. If 1.0 L of 0.1 M NaOH is added to the flask, what is the concentration of the resulting solution?
A. 0.05 M
B. 0.075 M
C. 0.1 M
D. 0.125 M
Question 9
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
A. 1
B. 2
C. 3
D. 4
Question 10
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 11
A catalyst is added to a reaction mixture to increase the rate of reaction. Which of the following is a characteristic of a catalyst?
A. Increases the activation energy
B. Decreases the activation energy
C. Increases the reaction rate
D. Decreases the reaction rate
Question 12
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 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 molar mass of M?
A. 50 g/mol
B. 75 g/mol
C. 100 g/mol
D. 125 g/mol
Question 14
A 2.0 L flask contains 0.1 M HCl. If 1.0 L of 0.1 M NaOH is added to the flask, what is the concentration of the resulting solution?
A. 0.05 M
B. 0.075 M
C. 0.1 M
D. 0.125 M
Question 15
The atomic radius of an element in the periodic table increases down a group due to the addition of new energy levels. However, the atomic radius of an element in the periodic table decreases across a period due to the increase in effective nuclear charge. Which of the following elements has the largest atomic radius?
A. Rb
B. Cs
C. Fr
D. Ba

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