POST UTME LAUTECH 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of $NH_4Cl$ in water is prepared by dissolving $10.0,g$ of $NH_4Cl$ in $100,mL$ of water. Calculate the molarity of the solution.
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 5.0 M
Question 2
Determine the major product of the reaction between 2-methylpropene and HCl.
A. 2-chloro-2-methylpropane
B. 2-chloro-2-methylbu\tane
C. 2-chloro-3-methylbu\tane
D. 2-chloro-2-methylpen\tane
Question 3
A 0.5 M solution of H2SO4 (aq) is mixed with a 0.5 M solution of NaOH (aq) in a 1:1 ratio. What is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 4
A polymer is formed by the condensation reaction between a diol and a diacid. If the molecular weight of the diol is 180 g/mol and the molecular weight of the diacid is 150 g/mol, what is the molecular weight of the polymer formed?
A. 360 g/mol
B. 420 g/mol
C. 480 g/mol
D. 540 g/mol
Question 5
A sample of 1.0 g of a hydrocarbon is burned in a combustion tube. The volume of CO2 produced is 2.5 L at STP. What is the empirical formula of the hydrocarbon?
A. CH4
B. C2H6
C. C3H8
D. C4H10
Question 6
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To measure the pH of the solution
Question 7
A 1.0 L flask contains 0.50 mol of an ideal gas at a temperature of 300 K. If the gas is compressed to 0.50 L, what is the new temperature of the gas?
A. 600 K
B. 700 K
C. 800 K
D. 900 K
Question 8
A gas at s\tandard temperature and pressure (STP) has a volume of 22.4 liters. What is the volume of the gas at a temperature of 273 K and a pressure of 1 atm?
A. 10.2 liters
B. 15.6 liters
C. 20.8 liters
D. 25.4 liters
Question 9
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 50 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 10
A solution of sulfuric acid (H2SO4) is 0.5 M. What is the concentration of hydrogen ions \( H+ \) in the solution?
A. 0.1 M
B. 0.25 M
C. 0.5 M
D. 1 M
Question 11
A solution of 0.10 M NaCl is prepared by dissolving 10 g of NaCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 10 g/L
B. 20 g/L
C. 30 g/L
D. 40 g/L
Question 12
The s\tandard enthalpy of formation of CO (g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of formation of C2H6 (g) if the s\tandard enthalpy of formation of H2O (l) is -285.8 kJ/mol.
A. -83.8 kJ/mol
B. -84.8 kJ/mol
C. -85.8 kJ/mol
D. -86.8 kJ/mol
Question 13
A metal M has a density of $8.5,g/cm^3$. If $3.0,g$ of the metal occupies a volume of $0.2,cm^3$, what is the percentage of the metal that is made up of the element with atomic number 11?
A. 30%
B. 50%
C. 70%
D. 90%
Question 14
A sample of a non-metal has a mass of 2.5 g and a volume of 5 mL. What is the density of the non-metal?
A. 0.1 g/mL
B. 0.5 g/mL
C. 1 g/mL
D. 2 g/mL
Question 15
A 2.5 M solution of HCl (aq) is mixed with a 2.5 M solution of NaOH (aq) in a 1:1 ratio. What is the concentration of the resulting solution?
A. 2.5 M
B. 5.0 M
C. 10.0 M
D. 12.5 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: