POST UTME ELIZADE UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The s\tandard electrode potential of the couple Mn2+/Mn is -1.18 V. What is the s\tandard electrode potential of the couple Mn/Mn2+?
A. -1.18 V
B. 1.18 V
C. 0.00 V
D. 1.18 V
Question 2
A sample of $\text{CO}_2$ gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the volume of the gas at STP?
A. 1.00 L
B. 2.00 L
C. 3.00 L
D. 4.00 L
Question 3
The rate cons\tant (k) for a first-order reaction is given by the equation: k = Ae^\( -Ea/RT \). If the activation energy (Ea) is 100 kJ/mol, the gas cons\tant (R) is 8.314 J/mol*K, and the temperature (T) is 298 K, calculate the value of k when A = 1.0 s^\( -1 \) and the reaction rate cons\tant is 0.1 s^\( -1 \).
A. 0.5 s^\( -1 \)
B. 0.1 s^\( -1 \)
C. 1.0 s^\( -1 \)
D. 2.0 s^\( -1 \)
Question 4
A 1.0 L flask contains 0.1 M NaOH. What is the concentration of OH^- ions in the solution?
A. 0.01 M
B. 0.1 M
C. 0.5 M
D. 1.0 M
Question 5
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M HCl is titrated with 0.100 M NaOH, what is the pH of the solution after 15.0 mL of NaOH has been added?
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 6
The compound SO2 is a pollu\tant released into the atmosphere. What is the major environmental impact of SO2?
A. Acid rain
B. Global warming
C. Ozone depletion
D. Atmospheric pollution
Question 7
A 2.5 M solution of HCl is mixed with a 1.2 M solution of NaOH. Calculate the number of moles of HCl that react with NaOH.
A. 0.006 mol
B. 0.012 mol
C. 0.018 mol
D. 0.024 mol
Question 8
Determine the number of moles of $\text{CO}_2$ produced when 2.50 g of $\text{CaC}_2$ is completely decomposed according to the equation: $\text{CaC}_2(s) \rightarrow \text{Ca}(s) + \text{C}(s) + \text{CO}_2(g)$
A. 0.050 mol
B. 0.100 mol
C. 0.150 mol
D. 0.200 mol
Question 9
A 2.0 L flask contains 0.4 M HCl. What is the concentration of H^+ ions in the solution?
A. 0.01 M
B. 0.1 M
C. 0.4 M
D. 0.5 M
Question 10
A 1.0 M solution of Fe2+ is mixed with a 1.2 M solution of OH- ions. Calculate the pH of the resulting solution.
A. 2.5
B. 3.5
C. 4.5
D. 5.5
Question 11
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(l) from the following reaction: H2(g) + 1/2 O2(g) → H2O(l).
A. -285.8 kJ/mol
B. -393.5 kJ/mol
C. -241.8 kJ/mol
D. -572.3 kJ/mol
Question 12
A metal M has an electron configuration of [Kr] 5s1 4d10. Identify the metal and describe its electronic configuration.
A. Zn
B. Cd
C. Hg
D. Ag
Question 13
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after 15.0 mL of NaOH has been added.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 14
The rate cons\tant of a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
A. 0.005 M
B. 0.01 M
C. 0.05 M
D. 0.1 M
Question 15
The s\tandard enthalpy of formation of H2O(g) is -241.8 kJ/mol. Calculate the s\tandard enthalpy of formation of CO2(g) from the following reaction: H2(g) + 1/2 O2(g) → H2O(g).
A. -393.5 kJ/mol
B. -241.8 kJ/mol
C. -110.5 kJ/mol
D. -572.3 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: