POST UTME UNILORIN 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 10.0 M solution of HCl is titrated with 0.100 M NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, calculate the number of moles of HCl present in 50.0 mL of the solution.
A. 0.0050 mol
B. 0.010 mol
C. 0.015 mol
D. 0.020 mol
Question 2
A sample of a metal (M) reacts with chlorine gas (Cl2) to form a white solid. The reaction is as follows: M + Cl2 → MCl2. If 2.50 g of the metal reacts with 1.00 g of Cl2, what is the molar mass of the metal?
A. 50.0 g/mol
B. 75.0 g/mol
C. 100 g/mol
D. 125 g/mol
Question 3
A hydrocarbon is a compound that consists only of carbon and hydrogen atoms. Which of the following is an example of a hydrocarbon?
A. Methane
B. Ethanol
C. Propane
D. Bu\tane
Question 4
A 2.00 M solution of hydrogen peroxide (H2O2) is prepared by dissolving 40.0 g of H2O2 in water and diluting to a total volume of 1.00 L. Calculate the concentration of hydrogen ions \( H+ \) in the solution.
A. 1.00 M
B. 2.00 M
C. 4.00 M
D. 8.00 M
Question 5
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the monomer?
A. 200 g/mol
B. 400 g/mol
C. 600 g/mol
D. 800 g/mol
Question 6
A 10.0 mL sample of 0.100 M CaCl2 is mixed with 20.0 mL of 0.0500 M NaOH. What is the concentration of the resulting solution?
A. 0.0500 M
B. 0.0750 M
C. 0.100 M
D. 0.125 M
Question 7
Determine the molar mass of a polymer with the following structure: [-CH2-CH2-CH2-CH2-]n. Given that the repeating unit has a molecular weight of 28 g/mol, calculate the molar mass of the polymer.
A. 56 g/mol
B. 84 g/mol
C. 112 g/mol
D. 140 g/mol
Question 8
The atomic radius of an element in a particular period increases as you move from left to right in the periodic table. Which of the following is a correct explanation for this tr\end?
A. The atomic radius increases due to the increase in the number of energy levels.
B. The atomic radius increases due to the decrease in the effective nuclear charge.
C. The atomic radius increases due to the increase in the number of electrons in the outermost energy level.
D. The atomic radius increases due to the increase in the atomic mass.
Question 9
A solution contains 0.100 M NH3 and 0.0500 M HCl. What is the pH of the solution?
A. 4.00
B. 5.00
C. 6.00
D. 7.00
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 of the reac\tant after 10 minutes?
A. 0.05 M
B. 0.025 M
C. 0.1 M
D. 0.5 M
Question 11
A 50.0 g sample of a mixture of sodium chloride (NaCl) and calcium chloride (CaCl2) is dissolved in water to make 250 mL of solution. If the concentration of the solution is 0.500 M, what is the mass of sodium chloride in the mixture?
A. 10.0 g
B. 20.0 g
C. 30.0 g
D. 40.0 g
Question 12
In the process of electrolysis, the cathode is typically made of a material that is less reactive than the anode. Which of the following materials is commonly used for the cathode in the electrolysis of a molten salt?
A. Graphite
B. Platinum
C. Iridium
D. Tungsten
Question 13
A 100 mL sample of a 0.500 M solution of sodium hydroxide (NaOH) is mixed with 100 mL of a 0.500 M solution of hydrochloric acid (HCl). What is the concentration of the resulting solution?
A. 0.250 M
B. 0.500 M
C. 0.750 M
D. 1.00 M
Question 14
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. -110.5 kJ/mol
B. -393.5 kJ/mol
C. -74.8 kJ/mol
D. -283.5 kJ/mol
Question 15
The half-life of a radioactive subs\tance is 5 years. If the initial activity is 1000 Bq, what is the activity after 10 years?
A. 250 Bq
B. 500 Bq
C. 1000 Bq
D. 2000 Bq

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: