POST UTME DELSU 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
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 3
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 4
A sample of a polymer has a molecular weight of 50,000 g/mol. If 1.00 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the polymer in g/L?
A. 0.500 g/L
B. 0.500 g/L
C. 0.500 g/L
D. 0.500 g/L
Question 5
The reaction between nitrogen dioxide and water is represented by the equation: 3NO2 + H2O → 2HNO3 + NO. If 2.5 moles of NO2 react with excess water, what is the limiting reac\tant?
A. NO2
B. H2O
C. HNO3
D. NO
Question 6
A metal M reacts with chlorine gas to form a white solid MX. The reaction is as follows: M(s) + Cl2(g) → MX(s). If 2.50 g of M(s) reacts with 1.00 g of Cl2(g) to form 3.00 g of MX(s), calculate the molar mass of M.
A. 40.00 g/mol
B. 50.00 g/mol
C. 60.00 g/mol
D. 70.00 g/mol
Question 7
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 8
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 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
Determine 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.
A. -1206.60 kJ/mol
B. -1206.60 kJ/mol
C. -1206.60 kJ/mol
D. -1206.60 kJ/mol
Question 11
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 12
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 13
The s\tandard electrode potential of the couple Mn2+/Mn is -1.18 V. Calculate the s\tandard electrode potential of the couple MnO42-/Mn2+.
A. -0.90 V
B. -1.18 V
C. -1.48 V
D. -1.68 V
Question 14
A 2.00 M solution of HCl is prepared by dissolving 40.0 g of HCl in 1.00 L of water. What is the concentration of H+ ions in the solution?
A. 2.00 M
B. 2.00 M
C. 2.00 M
D. 2.00 M
Question 15
The reaction between sulfuric acid and sodium hydroxide is highly exothermic. Calculate the s\tandard enthalpy change for the reaction: H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l). Given that ΔH°(H2SO4) = -814 kJ/mol and ΔH°(NaOH) = -469 kJ/mol.
A. -1383 kJ/mol
B. -1234 kJ/mol
C. -1456 kJ/mol
D. -1590 kJ/mol

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