POST UTME IGBINEDION UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
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 3
The reaction of cyclohexane with bromine in the presence of light is an example of a reaction that proceeds through a radical mechanism. What is the major product formed when 1-bromocyclohexane is treated with sodium in liquid ammonia?
A. Cyclohexylamine
B. Benzene
C. Toluene
D. Ethylbenzene
Question 4
A metal rod of length 20 cm and cross-sectional area 1 cm^2 is connected to a 6 V battery. If the resistivity of the metal is 1.8 × 10^-8 Ωm, what is the current flowing through the rod?
A. 0.1 A
B. 0.2 A
C. 0.3 A
D. 0.4 A
Question 5
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 6
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 7
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. What is the s\tandard enthalpy of formation of CO2(g)?
A. -393.5 kJ/mol
B. -110.5 kJ/mol
C. -393.5 kJ/mol + 283 kJ/mol
D. -393.5 kJ/mol - 110.5 kJ/mol
Question 8
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 9
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
Question 10
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 11
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 12
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 13
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 14
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 15
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

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