POST UTME BOWEN UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 5.00 g of NaCl in 100.0 mL of water. What is the molarity of the solution?
A. 0.500 M
B. 0.750 M
C. 1.00 M
D. 1.25 M
Question 2
Determine the oxidation state of the underlined element in the compound [K_2Cr_2O_7].
A. +6
B. +5
C. +3
D. +2
Question 3
A 2.00 L container is filled with a gas at 25°C and 1.00 atm. What is the pressure of the gas in a 1.00 L container at 50°C?
A. 1.25 atm
B. 1.50 atm
C. 1.75 atm
D. 2.00 atm
Question 4
A 2.5 L flask contains 0.25 mol of an ideal gas at 27°C. Calculate the pressure of the gas in the flask.
A. 2.5 atm
B. 2.5 atm
C. 2.5 atm
D. 2.5 atm
Question 5
The following diagram shows a chemical apparatus setup. What is the purpose of the flask?
Question 6
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) if the s\tandard enthalpy of formation of CaO(s) is -635.09 kJ/mol and that of CO2(g) is -393.5 kJ/mol.
A. -1207.59 kJ/mol
B. -1207.59 kJ/mol
C. -1207.59 kJ/mol
D. -1207.59 kJ/mol
Question 7
A 1.0 L flask contains 0.50 mol of an ideal gas at 37°C. Calculate the volume of the gas in the flask.
A. 0.5 L
B. 0.5 L
C. 0.5 L
D. 0.5 L
Question 8
The following diagram shows a titration setup. What is the purpose of the beaker?
A. To mix the titrant and analyte
B. To measure the volume of the titrant
C. To measure the volume of the analyte
D. To measure the pH of the solution
Question 9
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the solution
B. To measure the concentration of the solution
C. To measure the pH of the solution
D. To measure the temperature of the solution
Question 10
The following diagram shows a chemical apparatus setup. What is the purpose of the condenser?
A. To cool the vapor
B. To heat the liquid
C. To mix the reac\tants
D. To measure the temperature
Question 11
The boiling point of a solution is 102°C. If the boiling point of the pure solvent is 100°C, what is the molality of the solution?
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 12
The reaction between sodium carbonate (Na2CO3) and hydrochloric acid (HCl) is represented by the equation: Na2CO3 + 2HCl → 2NaCl + H2O + CO2. What is the pH of the solution after the reaction?
A. 1
B. 2
C. 3
D. 4
Question 13
A 3.00 g sample of a metal is heated in a crucible until it melts. The mass of the crucible and metal is 3.50 g. The mass of the crucible alone is 2.50 g. What is the molar mass of the metal?
A. 50.0 g/mol
B. 75.0 g/mol
C. 100 g/mol
D. 150 g/mol
Question 14
The solubility of NaCl in water at 25°C is 37.2 g/100 g of water. Calculate the molar solubility of NaCl in water at 25°C.
A. 0.36 M
B. 0.36 M
C. 0.36 M
D. 0.36 M
Question 15
The diagram below shows a setup for the electrolysis of [NaCl] solution. Identify the product formed at the cathode.
A. [H_2]
B. [Cl_2]
C. [Na]
D. [NaOH]

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