POST UTME IGBINEDION UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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. -393.5 kJ/mol
C. -110.5 kJ/mol + 283 kJ/mol
D. -393.5 kJ/mol + 283 kJ/mol
Question 2
The reaction of benzene with chlorine in the presence of light produces a mixture of chlorinated benzenes. The major product is chlorobenzene. What is the structure of chlorobenzene?
A. C6H5Cl
B. C6H5CH2Cl
C. C6H5CHCl2
D. C6H5CCl3
Question 3
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 H2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol?
A. - 285.8 kJ/mol
B. - 285.8 kJ/g
C. - 285.8 kJ/mol x 18 g/mol
D. - 285.8 kJ/mol x 18 mol
Question 4
The half-life of a radioactive subs\tance is 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?
A. 25 Bq
B. 50 Bq
C. 75 Bq
D. 100 Bq
Question 5
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of CH4(g).
A. -74.8
B. -74.5
C. -74.2
D. -75.1
Question 6
A 1 M solution of NaOH is titrated with 0.5 M HCl. What is the pH of the solution after 50 mL of HCl has been added?
A. 1
B. 2
C. 3
D. 4
Question 7
A solution containing 0.10 M HCl and 0.10 M NaOH is mixed with 0.10 M NaCl. What is the concentration of HCl after the reaction?
A. 0.10 M
B. 0.05 M
C. 0.20 M
D. 0.15 M
Question 8
A 1.00 M solution of NaOH is titrated with a 1.00 M solution of HCl. If 25.0 mL of HCl is required to reach the equivalence point, calculate the pH of the resulting solution.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 9
The rate cons\tant of a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
Question 10
A 2.00 g sample of a gas is collected at 25.0°C and 1.00 atm. Calculate the volume of the gas in liters.
A. 0.500
B. 1.00
C. 2.00
D. 4.00
Question 11
A 2.50 g sample of a hydrocarbon is burned in a bomb calorimeter, and the heat of combustion is found to be - 35.5 kJ/g. What is the enthalpy of formation of the hydrocarbon?
A. - 35.5 kJ/g
B. - 35.5 kJ/mol
C. - 35.5 kJ/g x 2.50 g
D. - 35.5 kJ/g x 2.50 mol
Question 12
A 2.5 M solution of HCl is titrated with 0.5 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 13
A 2.50 g sample of a polymer is dissolved in 100.0 mL of solvent. The solution has a vis\cosity of 0.800 Pa·s. Calculate the molar mass of the polymer.
A. 1000
B. 2000
C. 3000
D. 4000
Question 14
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the equivalence point is reached at 35.0 mL of NaOH, calculate the pH of the resulting solution.
A. 3.00
B. 3.50
C. 4.00
D. 4.50
Question 15
The diagram below shows a titration setup. What is the concentration of the NaOH solution?
A. 0.10 M
B. 0.20 M
C. 0.30 M
D. 0.40 M

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