POST UTME RHEMA UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 5.00 g of NaCl in 100.0 mL of water. What is the molarity of the solution?
A. 0.500 M
B. 0.750 M
C. 1.00 M
D. 1.25 M
Question 2
A 2.00 L sample of a gas at 25°C and 1.00 atm is collected over water. If the vapor pressure of water at 25°C is 23.8 mmHg, calculate the partial pressure of the gas.
A. 0.97 atm
B. 1.00 atm
C. 1.03 atm
D. 1.07 atm
Question 3
Determine the molar solubility of AgCl in a 0.1 M solution of NaCl.
A. 1.0 x 10^-3 M
B. 1.0 x 10^-4 M
C. 1.0 x 10^-5 M
D. 1.0 x 10^-6 M
Question 4
A 2.5 g sample of a metal oxide is dissolved in 50 cm^3 of 0.1 M HCl. The resulting solution is then titrated with 0.1 M NaOH. If 25 cm^3 of NaOH is required to reach the equivalence point, what is the molar mass of the metal oxide?
A. 100 g/mol
B. 150 g/mol
C. 200 g/mol
D. 250 g/mol
Question 5
Determine the number of unpaired electrons in the ground state of a neutral atom of the element with atomic number 13.
A. 4
B. 2
C. 6
D. 8
Question 6
A solution contains 10.0 g of NaOH in 100.0 mL of water. What is the molarity of the solution?
A. 1.00 M
B. 1.25 M
C. 1.50 M
D. 1.75 M
Question 7
A 2.00 L flask contains 0.200 mol of O2 at 298 K. Calculate the mole \fraction of O2.
A. 0.100
B. 0.200
C. 0.300
D. 0.400
Question 8
The reaction between sulfur dioxide and oxygen to form sulfur trioxide is catalyzed by vanadium(V) oxide. Write the balanced equation for this reaction, including the role of the catalyst.
A. \text{SO}_2 + \text{O}_2 \xrightarrow[\text{V}_2\text{O}_5]{\text{catalyst}} \text{SO}_3
B. \text{SO}_2 + \text{O}_2 \xrightarrow[\text{V}_2\text{O}_5]{\text{catalyst}} \text{SO}_2
C. \text{SO}_2 + \frac{1}{2}\text{O}_2 \xrightarrow[\text{V}_2\text{O}_5]{\text{catalyst}} \text{SO}_2
D. \text{SO}_2 + \frac{1}{2}\text{O}_2 \xrightarrow[\text{V}_2\text{O}_5]{\text{catalyst}} \text{SO}_3
Question 9
The reaction between sodium hydroxide and hydrochloric acid is a neutralization reaction. Write the balanced equation for this reaction.
A. \text{NaOH} + \text{HCl} \rightarrow \text{NaCl} + \text{H}_2\text{O}
B. \text{NaOH} + \text{HCl} \rightarrow \text{NaCl} + \text{H}_2\text{O}_2
C. \text{NaOH} + \text{HCl} \rightarrow \text{NaCl} + \text{H}_2\text{O}_3
D. \text{NaOH} + \text{HCl} \rightarrow \text{NaCl} + \text{H}_2\text{O}
Question 10
A metal M has a density of 11.5 g/cm^3 and a molar mass of 65.4 g/mol. If a 2.5 g sample of the metal is obtained from a mineral, what is the volume of the sample in cm^3?
A. 1.1 cm^3
B. 2.2 cm^3
C. 3.3 cm^3
D. 4.4 cm^3
Question 11
A 2.50 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The mass of the metal oxide produced is 2.00 g. What is the percentage yield of the metal oxide?
A. 80.0%
B. 90.0%
C. 95.0%
D. 98.0%
Question 12
A 1 M solution of a strong acid is prepared by dissolving 36.5 g of the acid in 1 dm^3 of water. If the density of the acid is 1.2 g/cm^3, what is the molar mass of the acid?
A. 100 g/mol
B. 150 g/mol
C. 200 g/mol
D. 250 g/mol
Question 13
A solution contains 2.5 g of NaCl in 250 mL of water. What is the concentration of the solution in terms of molarity?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 14
The diagram below shows a titration setup. Identify the part labeled A.
A. burette
B. pipette
C. Erlenmeyer flask
D. beaker
Question 15
A 0.5 M solution of NaCl is prepared by dissolving 25 g of NaCl in 1 L of water. What is the concentration of the solution in terms of molality?
A. 0.5 m
B. 1.0 m
C. 2.0 m
D. 5.0 m

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