POST UTME RHEMA UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of a gas at 25°C and 1 atm is heated to 50°C at cons\tant volume. What is the new pressure of the gas?
A. 2 atm
B. 1 atm
C. 0.5 atm
D. 0.25 atm
Question 2
A 2.0 L sample of a gas at 25°C and 1 atm is compressed to 0.5 L at 50°C. What is the new pressure of the gas?
A. 2 atm
B. 4 atm
C. 6 atm
D. 8 atm
Question 3
Determine the molar solubility of CaF2 in 0.1 M NaF solution, given that the solubility product cons\tant (Ksp) for CaF2 is 3.9 × 10^-11.
A. 1.0 × 10^-4 M
B. 1.0 × 10^-5 M
C. 1.0 × 10^-6 M
D. 1.0 × 10^-7 M
Question 4
The s\tandard enthalpy of formation of CO2 is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO?
A. -110.5 kJ/mol
B. -130.5 kJ/mol
C. -150.5 kJ/mol
D. -170.5 kJ/mol
Question 5
A solution containing 0.1 M NaOH and 0.1 M HCl is mixed. What is the pH of the resulting solution?
A. 7
B. 6
C. 5
D. 4
Question 6
A 1.00 M solution of NaOH is mixed with 1.00 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 7
A mixture of 2.0 g of C6H14 and 3.0 g of C4H10 is burned in a bomb calorimeter. The heat of combustion of C6H14 is -3940 kJ/mol, and the heat of combustion of C4H10 is -2870 kJ/mol. What is the total heat of combustion of the mixture?
A. -7840 kJ
B. -6940 kJ
C. -5940 kJ
D. -4940 kJ
Question 8
A polymer is made up of repeating units of the following structure: CH2=CH-CH2-CH2-CH2. What is the type of polymer?
A. Polyethylene
B. Polypropylene
C. Polyvinyl chloride
D. Polyester
Question 9
A sample of a gas at 25°C and 1 atm is compressed to 2 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 10
A 2.5 L sample of CO2 at 25°C and 1 atm is heated to 50°C. Calculate the new volume of CO2, assuming ideal gas behavior.
A. 3.5 L
B. 4.2 L
C. 5.0 L
D. 6.0 L
Question 11
A diagram of a redox reaction is shown below. What is the oxidation state of the element X?
A. +2
B. -2
C. 0
D. +1
Question 12
A solution of sodium chloride is prepared by dissolving 35.5 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 13
A solution of 10 g of NaCl in 100 g of water has a boiling point elevation of 0.5°C. What is the molality of the solution?
A. 0.1 m
B. 0.5 m
C. 1 m
D. 2 m
Question 14
The rate cons\tant for a first-order reaction is 0.0500 min^-1. What is the half-life of the reaction?
A. 3.46 min
B. 13.9 min
C. 27.8 min
D. 69.3 min
Question 15
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4

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