POST UTME BELLS UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.00 L sample of a gas at 25.0°C and 1.00 atm is collected over water at 25.0°C. If the vapor pressure of water at 25.0°C is 23.8 torr, what is the partial pressure of the gas?
A. 0.976 atm
B. 0.987 atm
C. 0.998 atm
D. 1.01 atm
Question 2
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 7
B. 10
C. 12
D. 14
Question 3
The s\tandard enthalpy of formation of NH3(g) is -45.9 kJ/mol. Calculate the s\tandard enthalpy of formation of N2(g) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
D. 0 kJ/mol
Question 4
A 0.500 M solution of HCl is prepared by dissolving 25.0 g of HCl in 1.00 L of water. What is the concentration of H+ ions in the solution?
A. 0.500 M
B. 0.250 M
C. 0.100 M
D. 0.0500 M
Question 5
Determine the major product of the reaction between 2-methylpropene and HCl.
A. 2-chloro-2-methylpropane
B. 2-chloro-2-methylpropene
C. 2-chloro-2-methylbu\tane
D. 2-chloro-2-methylpen\tane
Question 6
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of formation of C(s) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
D. 0 kJ/mol
Question 7
A diagram of a chromatography setup is shown below. What is the purpose of the stationary phase?
A. To separate the components of a mixture
B. To identify the components of a mixture
C. To measure the concentration of a solution
D. To measure the pH of a solution
Question 8
The pH of a solution is a measure of its acidity or basicity. Which of the following solutions has a pH of 7?
A. 0.1 M HCl
B. 0.1 M NaOH
C. 0.1 M H2SO4
D. 0.1 M NaCl
Question 9
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. 0.100 M
D. 0.0500 M
Question 10
The diagram below shows a titration setup. Identify the part labeled A.
A. A
B. B
C. C
D. D
Question 11
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
D. 0 kJ/mol
Question 12
The s\tandard reduction potential of a half-cell is a measure of its t\endency to gain electrons. Which of the following half-cells has a negative s\tandard reduction potential?
A. Ag+/Ag
B. Cu2+/Cu
C. Fe3+/Fe
D. Zn2+/Zn
Question 13
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of C(s) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 14
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 15
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. 0 kJ/mol
C. 0 kJ/mol
D. 0 kJ/mol

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: