POST UTME OSUSTECH 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of N2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of N2 in the sample?
A. 0.5 atm
B. 0.75 atm
C. 1 atm
D. 1.5 atm
Question 2
A solution of 0.1 M NaCl is electrolyzed u\sing a platinum electrode. Calculate the mass of Cl2(g) collected at the anode after 2 hours.
A. 1.2 g
B. 2.4 g
C. 3.6 g
D. 4.8 g
Question 3
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is titrated with 0.0500 M HCl, what is the volume of HCl required to reach the equivalence point?
A. 50.0 mL
B. 75.0 mL
C. 100 mL
D. 125 mL
Question 4
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 10 mL of HCl has been added.
A. 1
B. 2
C. 3
D. 4
Question 5
A sample of CO2 is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of CO2 in the sample?
A. 0.5 atm
B. 0.75 atm
C. 1 atm
D. 1.5 atm
Question 6
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of vaporization of 1 mol of H2O(l) to form H2O(g).
A. 40.7 kJ/mol
B. 41.7 kJ/mol
C. 42.7 kJ/mol
D. 43.7 kJ/mol
Question 7
A 2.0 g sample of a polymer is dissolved in 100 mL of a solvent. What is the molar mass of the polymer if the osmotic pressure of the solution is 2.5 atm at 25°C?
A. 1000 g/mol
B. 2000 g/mol
C. 5000 g/mol
D. 10000 g/mol
Question 8
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is titrated with 0.0500 M HCl, what is the pH of the resulting solution at the equivalence point?
A. 7.00
B. 8.00
C. 9.00
D. 10.0
Question 9
A 1.0 M solution of H2SO4 is mixed with a 1.0 M solution of NaOH in a 1:1 ratio. What is the resulting pH of the solution?
A. 7
B. 10
C. 14
D. pH 7
Question 10
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH in a 1:1 ratio. What is the resulting pH of the solution?
A. 7
B. 10
C. 14
D. pH 7
Question 11
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.0500 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.00250 mol
B. 0.00500 mol
C. 0.00750 mol
D. 0.0100 mol
Question 12
The s\tandard enthalpy of formation of C6H12O6(s) is -1273.3 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mol of C6H12O6(s) to form CO2(g) and H2O(l).
A. -1273.3 kJ/mol
B. -1273.3 kJ/mol + 1 kJ/mol
C. -1273.3 kJ/mol - 1 kJ/mol
D. -1273.3 kJ/mol + 2 kJ/mol
Question 13
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.0500 M HCl. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.00250 mol
B. 0.00500 mol
C. 0.00750 mol
D. 0.0100 mol
Question 14
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1 mol of C(s) to form CO2(g).
A. -393.5 kJ/mol
B. -393.5 kJ/mol + 1 kJ/mol
C. -393.5 kJ/mol - 1 kJ/mol
D. -393.5 kJ/mol + 2 kJ/mol
Question 15
Determine the number of moles of oxygen gas (O2) produced at s\tandard temperature and pressure (STP) from the complete combustion of 2.50 g of glu\cose (C6H12O6).
A. 0.125 mol
B. 0.250 mol
C. 0.500 mol
D. 1.00 mol

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