POST UTME AAUA 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of gas occupies a volume of 2.0 L at a pressure of 1.0 atm and a temperature of 300 K. What is the new volume of the gas if the pressure is increased to 2.0 atm and the temperature is decreased to 200 K?
A. 1.0 L
B. 2.0 L
C. 3.0 L
D. 4.0 L
Question 2
A 25.0 mL sample of a solution containing 0.100 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the titration?
A. 7.00
B. 8.00
C. 9.00
D. 10.0
Question 3
A cell has a s\tandard electrode potential of 0.5 V. What is the cell potential at 25°C and 1 atm?
A. 0.5 V
B. 0.6 V
C. 0.7 V
D. 0.8 V
Question 4
A 2.0 M solution of hydrochloric acid (HCl) is mixed with a 2.0 M solution of sodium hydroxide (NaOH) in a 1:1 ratio. What is the resulting pH of the solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 5
A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. Calculate the pH of the resulting solution after the reaction is complete.
A. 1
B. 2
C. 3
D. 4
Question 6
In a redox reaction, what is the role of the oxidizing agent?
A. To donate electrons
B. To accept electrons
C. To facilitate the reaction
D. To inhibit the reaction
Question 7
A 1.0 L flask contains 0.5 mol of an ideal gas at 27°C. What is the volume of the gas at 37°C?
A. 1.5 L
B. 2.0 L
C. 2.5 L
D. 3.0 L
Question 8
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the reaction is complete?
A. 7
B. 10
C. 14
D. 12
Question 9
Determine the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). The s\tandard enthalpy of formation for Al2O3(s) is -1675 kJ/mol, and the s\tandard enthalpy of formation for Fe2O3(s) is -824 kJ/mol. The s\tandard enthalpy of formation for Al(s) is 0 kJ/mol, and the s\tandard enthalpy of formation for Fe(s) is 0 kJ/mol.
A. -1829 kJ/mol
B. -1675 kJ/mol
C. -824 kJ/mol
D. -2869 kJ/mol
Question 10
A colloid is formed by disper\sing 10 g of silica in 100 mL of water. If the density of the silica is 2.5 g/mL, what is the volume percentage of the silica in the colloid?
A. 10%
B. 20%
C. 30%
D. 40%
Question 11
A 2.50 g sample of a polymer is dissolved in 50.0 mL of a solvent. If the molar mass of the polymer is 50,000 g/mol, what is the concentration of the polymer solution in g/L?
A. 0.10 g/L
B. 0.50 g/L
C. 1.00 g/L
D. 5.00 g/L
Question 12
A solution of 0.1 M NaCl is prepared by dissolving 0.1 g of NaCl in 100 mL of water. Calculate the concentration of the solution in g/L.
A. 0.1 g/L
B. 0.2 g/L
C. 0.3 g/L
D. 0.4 g/L
Question 13
A solution of NaCl is prepared by dissolving 35.5 g of NaCl in 100 mL of water. If the density of the solution is 1.05 g/mL, what is the molarity of the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 14
A 1.00 g sample of a hydrocarbon is burned in a combustion reaction. If the products are 1.50 g of CO2 and 0.50 g of H2O, what is the empirical formula of the hydrocarbon?
A. C_2H_4
B. C_2H_6
C. C_3H_6
D. C_4H_8
Question 15
A 2.00 L flask contains 0.500 atm of an ideal gas at 25°C. If the gas is compressed to 1.00 L at cons\tant temperature, what is the new pressure?
A. 1.00 atm
B. 1.50 atm
C. 2.00 atm
D. 2.50 atm

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