POST UTME DELSU 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 g sample of a polymer, P, has a molecular weight of 500 g/mol. Calculate the number of moles of P in the sample.
A. 0.005 mol
B. 0.005 mol
C. 0.005 mol
D. 0.005 mol
Question 2
A 2.00 M solution of HCl(aq) is mixed with a 2.00 M solution of NaOH(aq). If 25.0 mL of each solution is used, calculate the pH of the resulting solution.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 3
A 0.1 M solution of a weak base, B, has a pH of 9.5. Calculate the value of Kb for the base.
A. 1.3 x 10^-5
B. 1.3 x 10^-5
C. 1.3 x 10^-5
D. 1.3 x 10^-5
Question 4
A solution of a weak acid, HA, has a pH of 4.5. Calculate the value of Ka for the acid.
A. 1.3 x 10^-5
B. 1.3 x 10^-5
C. 1.3 x 10^-5
D. 1.3 x 10^-5
Question 5
The pH of a solution is 4.5. Calculate the concentration of hydrogen ions in the solution.
A. 1.0 x 10^{-5} M
B. 1.0 x 10^{-4} M
C. 1.0 x 10^{-3} M
D. 1.0 x 10^{-2} M
Question 6
A 10 mL sample of a solution containing 0.2 M HCl is titrated with 0.2 M NaOH. Calculate the pH of the solution at the equivalence point.
A. 7.0
B. 7.3
C. 7.6
D. 8.0
Question 7
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of CO2(g) from CO(g) and 1/2 O2(g) is -393.5 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 8
A 2.0 M solution of HCl is titrated with a 1.0 M solution of NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the number of moles of HCl present in the solution?
A. 0.025 mol
B. 0.050 mol
C. 0.100 mol
D. 0.200 mol
Question 9
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 gas mixture?
A. 0.5 atm
B. 0.75 atm
C. 1 atm
D. 1.5 atm
Question 10
A 2.5 M solution of sulfuric acid (H2SO4) is mixed with a 1.5 M solution of sodium hydroxide (NaOH). Calculate the number of moles of sulfuric acid that react with sodium hydroxide.
A. 2.5 mol
B. 3.75 mol
C. 4.5 mol
D. 5.25 mol
Question 11
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol and the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol?
A. -285.8 kJ/mol
B. -285.6 kJ/mol
C. -285.4 kJ/mol
D. -285.2 kJ/mol
Question 12
A 10 L \tank contains 5.0 g of nitrogen gas (N2) at a temperature of 298 K. Calculate the pressure of the nitrogen gas in the \tank.
A. 101325 Pa
B. 202650 Pa
C. 303875 Pa
D. 404100 Pa
Question 13
Calculate the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol, and ΔHf(C(s)) = 0 kJ/mol.
A. -179.18 kJ/mol
B. -178.18 kJ/mol
C. -179.51 kJ/mol
D. -178.51 kJ/mol
Question 14
A 2.0 g sample of a polymer is dissolved in 100 mL of a solvent. The resulting solution has a vis\cosity of 0.5 Pa·s. What is the molar mass of the polymer?
A. 1000 g/mol
B. 2000 g/mol
C. 5000 g/mol
D. 10000 g/mol
Question 15
A 25 mL sample of a solution containing 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL

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: