POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.50 L flask contains 0.500 mol of an ideal gas at 298 K. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 atm
B. 2.01 atm
C. 3.01 atm
D. 4.01 atm
Question 2
A 2.5 M solution of HCl is titrated with 1.5 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 3
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. -393.5 kJ/mol
C. -74.8 kJ/mol
D. -283.4 kJ/mol
Question 4
A metal (M) reacts with oxygen to form a basic oxide. The reaction is: 4M + 3O2 → 2M2O3. If 2.0 g of M is burned in air, what is the volume of O2 consumed at STP?
A. 1.0 L
B. 2.0 L
C. 3.0 L
D. 4.0 L
Question 5
A 2.50 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 torr, what is the partial pressure of the gas?
A. 0.976 atm
B. 0.987 atm
C. 0.998 atm
D. 1.00 atm
Question 6
A 0.500 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 torr, what is the partial pressure of the gas?
A. 0.976 atm
B. 0.987 atm
C. 0.998 atm
D. 1.00 atm
Question 7
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of H2SO4. If the reaction is complete, what is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 8
A 2.50 g sample of a polymer is dissolved in 100.0 mL of solvent. The solution is then titrated with 0.100 M NaOH. Calculate the number-average molecular weight of the polymer.
A. 10,000 g/mol
B. 20,000 g/mol
C. 30,000 g/mol
D. 40,000 g/mol
Question 9
The reaction between ethene and bromine in the presence of light produces 1,2-dibromoethane. Write the equation for this reaction, including the state of matter for each reac\tant and product.
A. C2H4 + Br2 → C2H4Br2
B. C2H4 + Br2 → C2H5Br
C. C2H4 + Br2 → C2H4Br
D. C2H4 + Br2 → C2H4Br2
Question 10
A solution of H2SO4 is 0.5 M in H+ ions. What is the concentration of HSO4- ions in the solution?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 11
The density of a gas is 1.2 g/L at 25°C and 1 atm. What is the molar mass of the gas?
A. 12 g/mol
B. 24 g/mol
C. 36 g/mol
D. 48 g/mol
Question 12
Determine the number of moles of $CO_2$ produced when 2.5 g of $CaC_2$ is completely decomposed at cons\tant pressure and temperature.
A. 0.125 mol
B. 0.25 mol
C. 0.5 mol
D. 1.0 mol
Question 13
A 2.5 M solution of HCl is titrated with 1.5 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 14
A 1.0 M solution of H2SO4 is titrated with 1.5 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 2.50-g sample of a polymer is dissolved in 250 mL of a solvent. If the density of the solution is 1.05 g/mL, what is the molar mass of the polymer?
A. 10,000 g/mol
B. 20,000 g/mol
C. 30,000 g/mol
D. 40,000 g/mol

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