POST UTME ELIZADE UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The boiling point of water is 100°C. What is the boiling point of a solution containing 10% w/w of a non-volatile solute?
A. 99.5°C
B. 99.0°C
C. 98.5°C
D. 98.0°C
Question 2
The half-reaction for the oxidation of H2 is given by: 2H2 + O2 → 2H2O. What is the number of moles of H2 required to react with 1 mole of O2?
A. 1
B. 2
C. 3
D. 4
Question 3
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) from the following reaction: H2(g) + 1/2 O2(g) → CO(g).
A. -110.5 kJ/mol
B. -393.5 kJ/mol
C. -241.8 kJ/mol
D. -572.3 kJ/mol
Question 4
A polymer is made up of repeating units of $\text{C}_6\text{H}_4\text{O}_2$ linked together. What is the polymer?
A. $\text{Polyethylene}$
B. $\text{Polypropylene}$
C. $\text{Polyvinyl chloride}$
D. $\text{Polyacrylonitrile}$
Question 5
The compound H2O is a type of polar molecule. What is the dipole moment of this molecule?
A. 0 D
B. 1.8 D
C. 2.2 D
D. 3.0 D
Question 6
The compound C6H12O6 is a type of sugar. What is the molecular formula for this compound?
A. C5H11O5
B. C6H12O6
C. C7H14O7
D. C8H16O8
Question 7
A 2.0 M solution of HCl is prepared by dissolving 40 g of HCl in 100 mL of water. Calculate the molarity of the solution.
A. 2.0 M
B. 4.0 M
C. 6.0 M
D. 8.0 M
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 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 10
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 11
A solution contains 0.500 M NaCl. Calculate the molar solubility of NaCl.
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 12
Determine the oxidation state of nitrogen in the compound NO2.
A. +1
B. +2
C. +3
D. +4
Question 13
Determine the number of unpaired electrons in the ground state of the chromium atom, given that the electron configuration is [Ar] 3d5 4s1.
A. 1
B. 3
C. 5
D. 7
Question 14
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 15
A 1.5 L flask contains 0.3 M NaOH. What is the concentration of OH^- ions in the solution?
A. 0.01 M
B. 0.1 M
C. 0.3 M
D. 0.5 M

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: