POST UTME FUTA 2020 Chemistry | Objective

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Question 1 View Details
The rate cons\tant of a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration after 10 minutes?
Correct A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M

Correct Answer: A

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Question 2 View Details
A polymer has a molecular weight of 100,000 g/mol. If 1 g of the polymer is dissolved in 100 mL of water, what is the concentration of the polymer in g/L?
A. 1 g/L
B. 10 g/L
Correct C. 100 g/L
D. 1000 g/L

Correct Answer: C

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Question 3 View Details
A solution contains 0.1 M NaCl. If 10 mL of the solution is titrated with 0.1 M AgNO3, what is the concentration of the chloride ion after the titration?
A. 0.01 M
Correct B. 0.02 M
C. 0.03 M
D. 0.04 M

Correct Answer: B

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Question 4 View Details
A sample of nitrogen gas has a volume of 100 mL at a pressure of 1 atm and a temperature of 300 K. What is the number of moles of nitrogen gas?
A. 0.01 mol
B. 0.02 mol
Correct C. 0.03 mol
D. 0.04 mol

Correct Answer: C

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Question 5 View Details
A solution contains 0.1 M HCl. If 10 mL of the solution is titrated with 0.1 M NaOH, what is the concentration of the hydroxide ion after the titration?
A. 0.01 M
Correct B. 0.02 M
C. 0.03 M
D. 0.04 M

Correct Answer: B

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Question 6 View Details
A mixture of 2.5 g of sodium chloride (NaCl) and 1.5 g of anhydrous calcium chloride (CaCl2) is dissolved in 50 mL of water. Calculate the molar concentration of the resulting solution.
A. 0.15 M
Correct B. 0.20 M
C. 0.25 M
D. 0.30 M

Correct Answer: B

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Question 7 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.0 g of carbon at 298 K.
Correct A. -32.8 kJ
B. -33.2 kJ
C. -34.5 kJ
D. -35.9 kJ

Correct Answer: A

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Question 8 View Details
A 2.0 M solution of sodium hydroxide (NaOH) is mixed with a 1.0 M solution of hydrochloric acid (HCl). Calculate the pH of the resulting solution.
A. 1.0
Correct B. 2.0
C. 3.0
D. 4.0

Correct Answer: B

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Question 9 View Details
A sample of a non-ideal gas is found to have a pressure of 2.5 atm at a temperature of 298 K. Calculate the volume of the gas u\sing the van der Waals equation.
A. 10.0 L
B. 15.0 L
Correct C. 20.0 L
D. 25.0 L

Correct Answer: C

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Question 10 View Details
A 1.0 M solution of sodium nitrate (NaNO3) is mixed with a 1.0 M solution of potassium chloride (KCl). Calculate the molar concentration of the resulting solution.
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

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Question 11 View Details
The rate cons\tant of a reaction is given by the equation: k = Ae^\( -Ea/RT \). If the rate cons\tant at 25°C is 0.05 s^\( -1 \) and at 50°C is 0.2 s^\( -1 \), calculate the activation energy (Ea) of the reaction in kJ/mol.
A. 50 kJ/mol
B. 75 kJ/mol
Correct C. 100 kJ/mol
D. 125 kJ/mol

Correct Answer: C

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Question 12 View Details
A 2.5 g sample of a metal oxide is heated in a crucible until it is completely reduced to its constituent metal. If the mass of the metal produced is 1.8 g, calculate the percentage of metal in the original sample.
A. 72%
Correct B. 80%
C. 88%
D. 96%

Correct Answer: B

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Question 13 View Details
A solution of 0.1 M NaOH is titrated with 0.1 M HCl. If 20 mL of the acid is required to reach the equivalence point, calculate the volume of the base required to reach the equivalence point.
Correct A. 20 mL
B. 40 mL
C. 60 mL
D. 80 mL

Correct Answer: A

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Question 14 View Details
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.
Correct A. -110.5 kJ/mol
B. -130.5 kJ/mol
C. -150.5 kJ/mol
D. -170.5 kJ/mol

Correct Answer: A

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Question 15 View Details
A 10 g sample of a metal is heated in a crucible until it is completely oxidized. If the mass of the oxide produced is 15 g, calculate the percentage of the metal that is oxidized.
A. 60%
B. 70%
Correct C. 80%
D. 90%

Correct Answer: C

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Question 16 View Details
A solution of 0.2 M HCl is titrated with 0.2 M NaOH. If 30 mL of the base is required to reach the equivalence point, calculate the volume of the acid required to reach the equivalence point.
Correct A. 30 mL
B. 40 mL
C. 50 mL
D. 60 mL

Correct Answer: A

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Question 17 View Details
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
Correct A. -285.8 kJ/mol
B. -295.8 kJ/mol
C. -305.8 kJ/mol
D. -315.8 kJ/mol

Correct Answer: A

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Question 18 View Details
A 5 g sample of a metal is heated in a crucible until it is completely oxidized. If the mass of the oxide produced is 7 g, calculate the percentage of the metal that is oxidized.
A. 40%
B. 50%
C. 60%
D. 70%

Correct Answer: VIEW ANSWER

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Question 19 View Details
Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of hydrogen gas (H2) react with oxygen gas according to the equation: 2H2 + O2 → 2H2O.
Correct A. 1.25 moles
B. 2.5 moles
C. 5 moles
D. 10 moles

Correct Answer: A

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Question 20 View Details
A 2.5 L flask contains 0.5 mol of an ideal gas at 300 K. If the gas is heated to 400 K at cons\tant volume, what is the new pressure?
A. 1.5 atm
B. 2.0 atm
Correct C. 2.5 atm
D. 3.0 atm

Correct Answer: C

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Question 21 View Details
A solution contains 5.0 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
Correct C. 1.0 M
D. 2.0 M

Correct Answer: C

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Question 22 View Details
A 10.0 mL sample of a 0.5 M solution of HCl is titrated with 0.5 M NaOH. What is the pH of the solution after the reaction is complete?
A. 1
B. 2
Correct C. 7
D. 14

Correct Answer: C

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Question 23 View Details
A catalyst is added to a reaction mixture containing 2.0 mol of reac\tant A and 3.0 mol of reac\tant B. The reaction is first-order with respect to A and second-order with respect to B. What is the rate cons\tant (k) if the reaction is 50% complete after 10 minutes?
A. 0.01 min^-1
B. 0.05 min^-1
Correct C. 0.10 min^-1
D. 0.50 min^-1

Correct Answer: C

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Question 24 View Details
A 1.0 M solution of NaOH is prepared by dissolving 40.0 g of NaOH in 1.0 L of water. What is the concentration of the solution in terms of molarity?
A. 0.1 M
B. 0.5 M
Correct C. 1.0 M
D. 2.0 M

Correct Answer: C

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Question 25 View Details
A 2.0 L flask contains 1.0 mol of an ideal gas at 300 K. If the gas is compressed to 1.0 L at cons\tant temperature, what is the new pressure?
A. 2.0 atm
B. 4.0 atm
Correct C. 6.0 atm
D. 8.0 atm

Correct Answer: C

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