POST UTME BSU 2020 Chemistry | Objective

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Question 1
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 2
A 2.0 L flask contains 0.050 M H2SO4. Calculate the pH of the solution.
A. 1.3
B. 1.4
C. 1.5
D. 1.6
Question 3
A 0.1 M solution of a weak acid HA has a pH of 4.5. Calculate the concentration of the conjugate base A^- in the solution.
A. 1.0 x 10^-5 M
B. 1.0 x 10^-4 M
C. 1.0 x 10^-3 M
D. 1.0 x 10^-2 M
Question 4
Determine the number of moles of oxygen gas (O2) required to completely combust 2.5 moles of propane (C3H8) according to the balanced equation: 2C3H8 + 19O2 → 12CO2 + 14H2O.
A. 0.5 moles
B. 1.0 mole
C. 1.5 moles
D. 2.0 moles
Question 5
The reaction between chlorine gas and sodium hydroxide solution is represented by the equation: Cl2 + 2NaOH → NaCl + NaClO + H2O. What is the oxidation state of chlorine in the product NaClO?
A. 0
B. +1
C. +2
D. +3
Question 6
A 1.0 M solution of a weak base B is prepared by dissolving 1.0 g of the base in 100 mL of water. Calculate the pH of the solution.
A. 9.0
B. 10.0
C. 11.0
D. 12.0
Question 7
A 1.00 M solution of HCl is titrated with a 1.00 M solution of NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?
A. 25.0 mL
B. 25.0 mL
C. 25.0 mL
D. 25.0 mL
Question 8
A 2.0 M solution of a salt is prepared by mixing 2.0 g of the salt with 100 mL of water. Calculate the molarity of the solution.
A. 0.02 M
B. 0.2 M
C. 2.0 M
D. 20 M
Question 9
A sample of an ideal gas at 25°C and 1 atm is heated to 50°C at cons\tant pressure. What is the ratio of the final volume to the initial volume?
A. 2
B. 1
C. 3
D. 4
Question 10
A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 11
A 0.500 M solution of NaCl is electrolyzed u\sing a platinum electrode. If the cell potential is 2.71 V, calculate the number of moles of Cl2 produced at the anode.
A. 0.0025 mol
B. 0.0025 mol
C. 0.0025 mol
D. 0.0025 mol
Question 12
The molar mass of a polymer is 200 g/mol. If 1.00 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 2.00 g/L
B. 2.00 g/L
C. 2.00 g/L
D. 2.00 g/L
Question 13
A 2.5 L flask contains 0.050 M H2SO4. Calculate the pH of the solution.
A. 1.3
B. 1.4
C. 1.5
D. 1.6
Question 14
A 0.1 M solution of hydrochloric acid (HCl) is titrated with a 0.1 M solution of sodium hydroxide (NaOH). If 20 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?
A. 10 mL
B. 20 mL
C. 30 mL
D. 40 mL
Question 15
A sample of a gas at 25°C and 1 atm is compressed to 2 atm. Calculate the new volume of the gas.
A. 1/2 V
B. 1/3 V
C. 2/3 V
D. 1/4 V

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