POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2017 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution of hydrochloric acid (HCl) is prepared by dissolving 25 mL of HCl in 250 mL of water. What is the pH of the solution?
A. 1.3
B. 1.5
C. 1.7
D. 1.9
Question 2
A solution of 0.1 M NaCl is electrolyzed u\sing a platinum electrode. What is the concentration of Cl2 at the anode after 10 minutes?
A. 0.01 M
B. 0.05 M
C. 0.1 M
D. 0.5 M
Question 3
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. 2.00
B. 7.00
C. 10.00
D. 12.00
Question 4
A sample of hydrogen gas (H2) is collected over water at a temperature of 25°C and a pressure of 1 atm. If the volume of the gas is 2.5 L, calculate the partial pressure of the hydrogen gas.
A. 0.5 atm
B. 1.0 atm
C. 1.5 atm
D. 2.0 atm
Question 5
A 1.0 M solution of ethanol (C2H5OH) is mixed with a 2.0 M solution of water (H2O). If the resulting solution is 1.5 M, what is the mole \fraction of ethanol in the resulting solution?
A. 0.25
B. 0.33
C. 0.50
D. 0.67
Question 6
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and that of O2(g) is 0 kJ/mol.
A. -241.8 kJ/mol
B. -285.8 kJ/mol
C. -393.5 kJ/mol
D. -483.5 kJ/mol
Question 7
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 25 g of NaOH in 100 mL of water. Calculate the pH of the solution.
A. 12
B. 13
C. 14
D. 15
Question 8
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 250 mL of water. What is the molarity of the solution?
A. 0.14 M
B. 0.18 M
C. 0.22 M
D. 0.26 M
Question 9
A 2.0 M solution of sodium hydroxide (NaOH) is mixed with a 1.0 M solution of acetic acid (CH3COOH). If the resulting solution is 1.5 M, what is the mole \fraction of sodium acetate (CH3COONa) in the resulting solution?
A. 0.25
B. 0.33
C. 0.50
D. 0.67
Question 10
In the electrolysis of a solution of copper(II) sulfate, what is the primary product at the cathode?
A. Oxygen gas
B. Hydrogen gas
C. Copper metal
D. Sulfuric acid
Question 11
A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. What is the resulting pH?
A. 1.00
B. 7.00
C. 10.00
D. 12.00
Question 12
A solution containing 0.10 M NaCl is electrolyzed u\sing a platinum electrode. If the electrolysis is carried out for 2.0 hours, what is the mass of Cl2 gas produced at the anode?
A. 0.50 g
B. 1.0 g
C. 2.0 g
D. 4.0 g
Question 13
A 10g sample of a non-metallic element has a density of 5.5 g/cm3. What is the volume of the sample in cm3?
A. 1.82 cm3
B. 2.27 cm3
C. 3.18 cm3
D. 4.55 cm3
Question 14
A sample of a gas at 25°C and 1 atm has a volume of 2.5 L. What is the volume of the gas at 50°C and 2 atm?
A. 1.25 L
B. 2.5 L
C. 5.0 L
D. 10.0 L
Question 15
A 2.5 M solution of hydrochloric acid (HCl) is prepared by dissolving 25 g of HCl in 100 mL of water. Calculate the pKa of the solution.
A. 1.2
B. 1.6
C. 2.0
D. 2.4

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: