POST UTME LEAD CITY UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of sulfuric acid (H2SO4) is electrolyzed. What is the primary product at the anode?
A. Oxygen gas
B. Hydrogen gas
C. Sulfur dioxide gas
D. Water
Question 2
The energy of an electron in the nth orbit of a hydrogen atom is given by the equation \( E_n = -\frac{13.6}{n^2} \) eV. What is the energy of an electron in the 3rd orbit?
A. -3.4
B. -1.5
C. 1.5
D. 3.4
Question 3
A 2.5 L flask contains 0.5 mol of an ideal gas at 300 K. What is the pressure of the gas?
A. 1.5 atm
B. 2.0 atm
C. 2.5 atm
D. 3.0 atm
Question 4
The reaction of chlorine gas with potassium iodide is an example of a redox reaction. What is the oxidation state of iodine in KI?
A. 0
B. +1
C. -1
D. +2
Question 5
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 6
A 2.5 L flask contains 0.75 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 2.5 atm
B. 3.0 atm
C. 3.5 atm
D. 4.0 atm
Question 7
Determine the molar mass of a polymer with the following structure: [-CH2-CH2-O-]n. Given that the molar mass of the repeating unit is 60 g/mol, calculate the molar mass of the polymer.
A. 120 g/mol
B. 180 g/mol
C. 240 g/mol
D. 300 g/mol
Question 8
The compound with the molecular formula CH4 is an example of a ______________.
A. alkane
B. alkene
C. alkyne
D. aromatic hydrocarbon
Question 9
The reaction of sulfur with oxygen is an example of a ______________ reaction.
A. combustion
B. oxidation
C. reduction
D. decomposition
Question 10
The compound with the molecular formula C2H6O is an example of a ______________.
A. aldehyde
B. ketone
C. alcohol
D. ether
Question 11
A 0.1 M solution of a weak base, B, is titrated with 0.1 M HCl. At the equivalence point, the pH of the solution is 7. What is the pKa of the base?
A. 4.5
B. 5.5
C. 6.5
D. 7.5
Question 12
What is the rate cons\tant of a reaction?
A. The rate cons\tant is a measure of the rate of reaction
B. The rate cons\tant is a measure of the equilibrium cons\tant
C. The rate cons\tant is a measure of the activation energy
D. The rate cons\tant is a measure of the reaction rate
Question 13
In the electrolysis of a solution of copper(II) sulfate, what is the primary product at the cathode?
A. Oxygen gas
B. Hydrogen gas
C. Copper metal
D. Sulfuric acid
Question 14
The reaction between sodium hydroxide and hydrochloric acid is represented by the equation \( NaOH + HCl \rightarrow NaCl + H_2O \). What is the type of reaction?
A. Synthesis
B. Decomposition
C. Replacement
D. Neutralization
Question 15
The diagram below shows a periodic table. What is the symbol for the element with atomic number 6?
A. C
B. N
C. O
D. F

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: