POST UTME LAUTECH 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The s\tandard enthalpy of combustion of C6H12O6 (s) is -2802 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.5 g of C6H12O6 (s).
A. -4203 kJ
B. -4204 kJ
C. -4205 kJ
D. -4206 kJ
Question 2
The element with atomic number 12 is classified as a metalloid. What is its symbol?
A. Mg
B. Ca
C. Si
D. Al
Question 3
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 4
A solution of sodium hydroxide (NaOH) is 0.2 M. What is the concentration of hydroxide ions \( OH- \) in the solution?
A. 0.1 M
B. 0.2 M
C. 0.5 M
D. 1 M
Question 5
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
Question 6
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 7
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 8
A solution contains 2.5 g of NaCl and 25 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 9
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 15.0 mL of NaOH.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 10
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 11
A 2.00 L flask contains 0.100 mol of N2(g) at 25.0°C. Calculate the pressure of the gas.
A. 0.100 atm
B. 0.500 atm
C. 1.00 atm
D. 2.00 atm
Question 12
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 13
A 50 mL sample of a 0.20 M solution of HCl is titrated with 0.10 M NaOH. What is the pH of the solution after the titration?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 14
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 15
The s\tandard enthalpy of formation of CO2 (g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of C2H6 (g) if the s\tandard enthalpy of formation of CO (g) is -110.5 kJ/mol and 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

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