POST UTME COVENANT UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.0 g sample of a hydrocarbon is burned in a bomb calorimeter and releases 12.5 kJ of heat. What is the molar mass of the hydrocarbon?
A. 20 g/mol
B. 30 g/mol
C. 40 g/mol
D. 50 g/mol
Question 2
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If the pH of the solution at the equivalence point is 7, calculate the volume of HCl required to reach the equivalence point.
A. 25 cm^3
B. 50 cm^3
C. 75 cm^3
D. 100 cm^3
Question 3
A 1.0 L sample of a gas at 25°C and 1 atm is collected over water. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the gas?
A. 760 mmHg
B. 737.2 mmHg
C. 700 mmHg
D. 600 mmHg
Question 4
A sample of 1.5 g of a subs\tance is dissolved in 50 cm^3 of water. If the density of the solution is 1.5 g/cm^3, calculate the molarity of the solution.
A. 0.2 M
B. 0.3 M
C. 0.4 M
D. 0.5 M
Question 5
A sample of gas at 25°C and 1 atm occupies a volume of 2.5 L. If the temperature is increased to 50°C at cons\tant pressure, what is the new volume of the gas?
A. 3.125 L
B. 4.166 L
C. 5.208 L
D. 6.25 L
Question 6
Calculate the s\tandard enthalpy of formation of CO2(g) from the following data: ΔHf(CO2(g)) = -393.5 kJ/mol, ΔHf(C) = 0 kJ/mol, ΔHf(O2(g)) = 0 kJ/mol.
A. -393.5 kJ/mol
B. -393.5 kJ/mol + 0 kJ/mol
C. -393.5 kJ/mol - 0 kJ/mol
D. -393.5 kJ/mol + 0 kJ/mol + 0 kJ/mol
Question 7
A 1.5 L sample of a gas at 30°C and 3 atm is collected over water. If the vapor pressure of water at 30°C is 31.8 mmHg, what is the partial pressure of the gas?
A. 2280 mmHg
B. 2237.1 mmHg
C. 2150 mmHg
D. 1900 mmHg
Question 8
A 2.5 L flask contains 0.5 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law: PV = nRT.
A. 101325 Pa
B. 202650 Pa
C. 303875 Pa
D. 405100 Pa
Question 9
A sample of N2 gas occupies a volume of 2.5 L at a pressure of 1.5 atm. What is the pressure of the gas when its volume is increased to 5.0 L?
A. 0.75 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 10
A solution contains 0.2 M NaCl and 0.1 M CaCl2. What is the concentration of Cl^- ions in the solution?
A. 0.3 M
B. 0.4 M
C. 0.5 M
D. 0.6 M
Question 11
A 10 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after the titration?
A. 1
B. 2
C. 3
D. 4
Question 12
A metal alloy is composed of 70% Cu and 30% Zn. If 100 g of the alloy is heated to 1000°C, what is the temperature of the alloy when it cools to 500°C?
A. 500°C
B. 600°C
C. 700°C
D. 800°C
Question 13
A 2.0 L sample of a gas at 50°C and 2 atm is collected over water. If the vapor pressure of water at 50°C is 92.5 mmHg, what is the partial pressure of the gas?
A. 1520 mmHg
B. 1477.5 mmHg
C. 1400 mmHg
D. 1200 mmHg
Question 14
A 0.5 M solution of H2SO4 is titrated with 0.5 M NaOH. What is the pH of the solution after 50 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 15
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 25 cm^3 of the HCl solution is required to reach the equivalence point, calculate the volume of NaOH required to reach the same point.
A. 25 cm^3
B. 50 cm^3
C. 75 cm^3
D. 100 cm^3

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