POST UTME AAUA 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.00 M solution of HCl is titrated with 1.00 M NaOH. If 20.0 mL of NaOH is required to reach the equivalence point, what is the concentration of the resulting solution?
A. 0.500 M
B. 0.750 M
C. 1.00 M
D. 1.25 M
Question 2
A 2.50-g sample of a metal carbonate is heated to produce a 1.25-g sample of the oxide. What is the molar mass of the metal carbonate?
A. 100 g/mol
B. 120 g/mol
C. 140 g/mol
D. 160 g/mol
Question 3
A 2.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 4
A 0.500 M solution of NaOH is titrated with 0.500 M HCl. If 25.0 mL of HCl is required to reach the equivalence point, what is the pH of the resulting solution?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 5
A 1.00 L sample of a gas at 25°C and 1.00 atm is compressed to 2.00 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.50
B. 1.00
C. 1.50
D. 2.00
Question 6
A 1.00 M solution of sodium hydroxide is titrated with 1.00 M hydrochloric acid. What is the pH of the solution after 50.0 mL of hydrochloric acid has been added?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 7
The s\tandard entropy of formation (ΔSf) for CO2(g) is -213.8 J/mol·K. If 2.50 mol of CO2 is produced at 298 K, what is the total entropy change (ΔS) for the reaction?
A. -536.5 J/K
B. -536.0 J/K
C. -535.5 J/K
D. -535.0 J/K
Question 8
A sample of a metal has a mass of 15.0 g and a volume of 3.00 cm³. If the density of the metal is 5.00 g/cm³, what is the number of moles of the metal?
A. 0.375 mol
B. 0.750 mol
C. 1.50 mol
D. 3.00 mol
Question 9
A metal M reacts with chlorine gas to form a white solid product. The reaction is as follows: M + Cl2 → MCl2. If 2.5 g of M reacts with 1.5 g of Cl2, what is the molar mass of M?
A. 50 g/mol
B. 60 g/mol
C. 70 g/mol
D. 80 g/mol
Question 10
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of the solution in mol/L?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 11
A sample of a metal oxide has a mass of 25.0 g and a volume of 5.00 cm³. If the density of the metal oxide is 7.50 g/cm³, what is the number of moles of the metal oxide?
A. 0.333 mol
B. 0.667 mol
C. 1.00 mol
D. 1.33 mol
Question 12
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) from the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1792.5 kJ/mol
B. -1792.8 kJ/mol
C. -1792.2 kJ/mol
D. -1792.1 kJ/mol
Question 13
The s\tandard entropy of formation (ΔSf) for CO2(g) is -213.8 J/mol·K. If 2.50 mol of CO2 is produced at 298 K, what is the total entropy change (ΔS) for the reaction?
A. -536.5 J/K
B. -536.0 J/K
C. -535.5 J/K
D. -535.0 J/K
Question 14
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.00 mol of C6H12O6(s).
A. -2800 kJ/mol
B. -2900 kJ/mol
C. -3000 kJ/mol
D. -3100 kJ/mol
Question 15
A 2.50 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide is 2.00 g, what is the percentage yield of the reaction?
A. 80.0
B. 85.0
C. 90.0
D. 95.0

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