POST UTME LEAD CITY UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution containing 0.100 M NH3 is titrated with 0.100 M HCl. What is the pH of the solution after 25.0 mL of HCl has been added?
A. 9.00
B. 10.00
C. 11.00
D. 12.00
Question 2
Determine the pH of a 0.1 M solution of HCl, given that the dissociation cons\tant of HCl is 10^-7.
A. 1
B. 2
C. 3
D. 4
Question 3
A solution containing 0.100 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after 50.0 mL of HCl has been added?
A. 7.00
B. 8.00
C. 9.00
D. 10.00
Question 4
The rate cons\tant (k) of a reaction is related to the activation energy (Ea) by the Arrhenius equation. What is the correct form of the Arrhenius equation?
A. \( k = Ae^{-Ea/RT} \)
B. \( k = Ae^{Ea/RT} \)
C. \( k = Ae^{-RT/Ea} \)
D. \( k = Ae^{RT/Ea} \)
Question 5
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 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 2.50-g sample of a compound containing only carbon and hydrogen is burned in a combustion apparatus. The volume of carbon dioxide produced is 1.25 L at 25°C and 1.00 atm. What is the empirical formula of the compound?
A. CH
B. C2H2
C. C2H4
D. C2H6
Question 8
A metal rod of length 50 cm and radius 2 cm is heated from 20°C to 100°C. Calculate the change in length of the rod.
A. 0.5 cm
B. 1 cm
C. 2 cm
D. 5 cm
Question 9
A sample of a metal is heated to a temperature of 873 K. If the metal has a specific heat capacity of 0.45 J/g°C, what is the energy required to heat the metal by 100°C?
A. 450 J
B. 500 J
C. 550 J
D. 600 J
Question 10
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 11
A solution contains 2.5 g of NaCl. If 25 mL of water is added to the solution, what is the new concentration of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 12
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of combustion of 1.00 g of carbon at 298 K?
A. -393.5 kJ/mol
B. -393.5 kJ/mol
C. -393.5 kJ/mol
D. -393.5 kJ/mol
Question 13
A 1.0 L sample of a gas at 25°C and 1 atm is compressed to 2.0 L at cons\tant temperature. Calculate the work done on the gas.
A. -1.0 L atm
B. -2.0 L atm
C. -3.0 L atm
D. -4.0 L atm
Question 14
A sample of a gas has a volume of 250 cm³ at a pressure of 1 atm and a temperature of 20°C. Calculate the volume of the gas at a pressure of 2 atm and a temperature of 50°C.
A. 500 cm³
B. 750 cm³
C. 1000 cm³
D. 1500 cm³
Question 15
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of combustion of 1.00 g of carbon at 298 K?
A. -393.5 kJ/mol
B. -393.5 kJ/mol
C. -393.5 kJ/mol
D. -393.5 kJ/mol

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: