POST UTME AFE BABALOLA UNIVERSITY 2023 Chemistry | Objective

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Question 1
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,2-dibromocyclohexane
Question 2
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 3
The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?
A. 1,2-dibromocyclohexane
B. 1,4-dibromocyclohexane
C. cis-1,2-dibromocyclohexane
D. trans-1,4-dibromocyclohexane
Question 4
A 1 L solution of a gas at 25°C and 1 atm is compressed to 10 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.1 L
B. 0.5 L
C. 1.0 L
D. 5.0 L
Question 5
A 2.50 L flask contains 0.150 mol of an ideal gas at 298 K. What is the pressure of the gas?
A. 1.01 x 10^2 Pa
B. 1.01 x 10^3 Pa
C. 1.01 x 10^4 Pa
D. 1.01 x 10^5 Pa
Question 6
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 7.00
B. 7.00
C. 7.00
D. 7.00
Question 7
A 0.500 M solution of sodium hydroxide (NaOH) is mixed with a 0.750 M solution of hydrochloric acid (HCl). Calculate the pH of the resulting solution.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 8
A polymer has a molecular weight of 100,000 g/mol. If 10 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 100 g/L
B. 200 g/L
C. 500 g/L
D. 1000 g/L
Question 9
The reaction of ethanol with hydrogen in the presence of a catalyst produces ethane. What is the balanced equation for this reaction?
A. \( C_2H_5OH + H_2 \rightarrow C_2H_6 + H_2O \)
B. \( C_2H_5OH + H_2O \rightarrow C_2H_6 + H_2 \)
C. \( C_2H_5OH + O_2 \rightarrow C_2H_6 + H_2O \)
D. \( C_2H_5OH + H_2 \rightarrow C_2H_6 + CO_2 \)
Question 10
The s\tandard Gibbs free energy change for the reaction 2NO(g) + O2(g) → 2NO2(g) is -22.4 kJ/mol. What is the equilibrium cons\tant (K) for this reaction?
A. 1.0 x 10^\( -5 \)
B. 1.0 x 10^\( -3 \)
C. 1.0 x 10^\( -2 \)
D. 1.0 x 10^\( -1 \)
Question 11
A sample of hydrogen gas (H2) is collected over water at 25°C and 1 atm. The volume of the gas is 2.50 L. Calculate the number of moles of hydrogen gas collected.
A. 0.010 mol
B. 0.020 mol
C. 0.030 mol
D. 0.040 mol
Question 12
The diagram below shows a titration setup. What is the purpose of the burette in this setup?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To separate the titrant and analyte
Question 13
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To separate the titrant and analyte
Question 14
A 0.1 M solution of a weak acid HA is mixed with a 0.1 M solution of a weak base B. The resulting solution is a buffer with a pH of 4.5. If 10 mL of 1 M HCl is added to the buffer, what is the new pH?
A. 3.5
B. 4.5
C. 5.5
D. 6.5
Question 15
A 1 M solution of a weak acid HA is mixed with a 1 M solution of a strong base B. The resulting solution is a solution with a pH of 7. If 10 mL of 1 M HCl is added to the solution, what is the new pH?
A. 6.5
B. 7.5
C. 8.5
D. 9.5

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