POST UTME AFE BABALOLA UNIVERSITY 2018 Chemistry | Objective

Are you preparing for POST UTME AFE BABALOLA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
Determine the number of moles of oxygen gas (O2) required to react completely with 2.50 moles of propane (C3H8) according to the balanced equation: 2C3H8 + 19O2 → 12CO2 + 14H2O.
A. 0.25 mol
Correct B. 0.50 mol
C. 1.00 mol
D. 1.25 mol

Correct Answer: B

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Question 2
A sample of a metal (M) has a mass of 25.0 g and a volume of 5.00 cm3. If the density of the metal is 8.00 g/cm3, what is the molar mass of the metal?
A. 40.0 g/mol
Correct B. 80.0 g/mol
C. 120 g/mol
D. 160 g/mol

Correct Answer: B

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Question 3
The diagram below shows a titration setup. If 25.0 cm3 of 0.100 M NaOH is required to neutralize 20.0 cm3 of HCl, what is the concentration of the HCl solution?
A. 0.0500 M
Correct B. 0.100 M
C. 0.200 M
D. 0.500 M

Correct Answer: B

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Question 4
A 2.50 g sample of a non-metallic element (X) is found to have a mass of 2.50 g and a volume of 5.00 cm3. If the density of the element is 5.00 g/cm3, what is the molar mass of the element?
A. 10.0 g/mol
Correct B. 20.0 g/mol
C. 30.0 g/mol
D. 40.0 g/mol

Correct Answer: B

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Question 5
The diagram below shows a redox reaction setup. If 25.0 cm3 of 0.100 M Fe2+ is required to reduce 20.0 cm3 of MnO4-, what is the concentration of the MnO4- solution?
A. 0.0500 M
Correct B. 0.100 M
C. 0.200 M
D. 0.500 M

Correct Answer: B

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Question 6
A 2.50 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The metal oxide is then reduced with hydrogen gas to produce the pure metal. If 1.75 g of the metal oxide is obtained, calculate the percentage yield of the metal.
A. 60%
B. 65%
Correct C. 70%
D. 75%

Correct Answer: C

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Question 7
A solution containing 0.050 M NaOH is mixed with a solution containing 0.050 M HCl. If 50.0 mL of the NaOH solution is added to 50.0 mL of the HCl solution, what is the pH of the resulting solution?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 8
A 2.00 L container holds 0.500 mol of an ideal gas at a temperature of 298 K. If the gas is allowed to expand to a volume of 4.00 L at cons\tant temperature, what is the new pressure of the gas?
A. 0.125 atm
B. 0.250 atm
C. 0.500 atm
Correct D. 1.00 atm

Correct Answer: D

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Question 9
A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. If 50.0 mL of the HCl solution is added to 50.0 mL of the NaOH solution, what is the concentration of the resulting solution?
A. 0.500 M
Correct B. 1.00 M
C. 1.50 M
D. 2.00 M

Correct Answer: B

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Question 10
A 2.00 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The metal oxide is then reduced with hydrogen gas to produce the pure metal. If 1.75 g of the metal oxide is obtained, calculate the percentage yield of the metal.
A. 60%
B. 65%
Correct C. 70%
D. 75%

Correct Answer: C

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