POST UTME UNILORIN 2025 Chemistry | Objective

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Question 1
The reaction between C6H12O6 and O2 is represented by the equation: C6H12O6 + 6O2 → 6CO2 + 6H2O. Calculate the volume of O2 required to react with 2.5 L of C6H12O6 at STP.
A. 15 L
B. 30 L
C. 45 L
D. 60 L
Question 2
A 3.0 L sample of a gas at 35°C and 1.5 atm is heated to 55°C. If the volume of the gas is tripled, what is the new pressure of the gas in atm?
A. 2.0 atm
B. 2.5 atm
C. 3.0 atm
D. 3.5 atm
Question 3
A polymer is formed by the condensation reaction between a diol and a diacid. If 2.5 g of the diol and 3.2 g of the diacid are used, and the molecular weight of the diol is 62 g/mol, while that of the diacid is 74 g/mol, calculate the number of moles of water formed during the reaction.
A. 0.05 mol
B. 0.1 mol
C. 0.15 mol
D. 0.2 mol
Question 4
A 1.5 L sample of a gas at 20°C and 0.8 atm is compressed to 0.2 L at 30°C. Calculate the new pressure of the gas in atm.
A. 1.2 atm
B. 1.5 atm
C. 2.0 atm
D. 2.5 atm
Question 5
A 2.5 M solution of HCl is titrated with a 1.5 M solution of NaOH. Calculate the number of moles of HCl required to react with 25 mL of NaOH.
A. 0.015 mol
B. 0.025 mol
C. 0.035 mol
D. 0.045 mol
Question 6
A sample of 1.5 g of a polymer is dissolved in 100 mL of a solvent. The solution is then titrated with 0.1 M NaOH. Calculate the number of moles of the polymer.
A. 0.01 mol
B. 0.02 mol
C. 0.03 mol
D. 0.04 mol
Question 7
A 1.0 M solution of NaOH is titrated with a 2.0 M solution of HCl. Calculate the number of moles of HCl required to react with 50 mL of NaOH.
A. 0.05 mol
B. 0.1 mol
C. 0.15 mol
D. 0.2 mol
Question 8
A solution of 0.1 M HCl is prepared by dissolving 4 g of HCl in 1000 mL of water. Calculate the pH of the solution.
A. 1
B. 2
C. 3
D. 4
Question 9
A solution contains 5.0 g of NaCl. If 10 mL of 0.1 M HCl is added to the solution, what is the pH of the resulting solution?
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 10
A 2.0 L sample of a gas at 25°C and 1.0 atm is heated to 50°C. If the volume of the gas is doubled, what is the new pressure of the gas in atm?
A. 1.5 atm
B. 2.0 atm
C. 2.5 atm
D. 3.0 atm
Question 11
A 2.5 L sample of a gas at 27°C and 1.2 atm is compressed to 0.5 L at 37°C. Calculate the new pressure of the gas in atm.
A. 1.5 atm
B. 2.1 atm
C. 2.5 atm
D. 3.2 atm
Question 12
Determine the number of moles of CO2 produced when 2.5 g of C6H12O6 is completely oxidized in the presence of excess oxygen.
A. 0.25 mol
B. 0.5 mol
C. 1.0 mol
D. 1.5 mol
Question 13
The reaction between CH4 and Cl2 is represented by the equation: CH4 + 4Cl2 → CCl4 + 4HCl. Calculate the volume of Cl2 required to react with 2.5 L of CH4 at STP.
A. 10 L
B. 20 L
C. 30 L
D. 40 L
Question 14
A mixture of 2.5 g of NaCl and 1.5 g of KCl is dissolved in 100 mL of water. Calculate the molarity of the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 15
A solution of 0.1 M NaOH is prepared by dissolving 4 g of NaOH in 1000 mL of water. Calculate the pH of the solution.
A. 12
B. 13
C. 14
D. 15

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