POST UTME SUMMIT UNIVERSITY 2025 Chemistry | Objective

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Question 1 View Details
Determine the pH of a 0.1 M solution of HCl.
Correct A. 1
B. 2
C. 3
D. 4

Correct Answer: A

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Question 2 View Details
A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after 15.0 mL of HCl has been added?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 3 View Details
A solution contains 0.250 g of NaCl per 100 mL of solution. What is the molarity of the solution?
A. 0.250 M
Correct B. 0.500 M
C. 1.00 M
D. 2.00 M

Correct Answer: B

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Question 4 View Details
A diagram of a titration setup is shown below.
Correct A. The burette contains 0.100 M HCl.
B. The burette contains 0.100 M NaOH.
C. The beaker contains 0.100 M HCl.
D. The beaker contains 0.100 M NaOH.

Correct Answer: A

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Question 5 View Details
A diagram of a chemical apparatus setup is shown below.
Correct A. The test tube contains 0.100 M NaOH.
B. The burette contains 0.100 M HCl.
C. The test tube contains 0.100 M HCl.
D. The burette contains 0.100 M NaOH.

Correct Answer: A

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Question 6 View Details
A sample of an ideal gas is heated from 300 K to 400 K at cons\tant volume. Calculate the change in entropy of the gas, given that the gas cons\tant is 8.314 J/mol*K.
Correct A. -1.00 kJ/mol*K
B. -2.00 kJ/mol*K
C. -3.00 kJ/mol*K
D. -4.00 kJ/mol*K

Correct Answer: A

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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 formation of CO(g) and O2(g) from their elements at 298 K.
Correct A. -110.5 kJ/mol
B. -393.5 kJ/mol
C. -74.8 kJ/mol
D. -285.8 kJ/mol

Correct Answer: A

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Question 8 View Details
A 2.50 g sample of a metal is heated to 1000°C and then quenched in water. The resulting solution is 0.500 M in metal ions. Calculate the molar mass of the metal.
A. 50.0 g/mol
Correct B. 75.0 g/mol
C. 100.0 g/mol
D. 125.0 g/mol

Correct Answer: B

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Question 9 View Details
A 1.00 L sample of a gas at 300 K and 1.00 atm is compressed to 2.00 atm at cons\tant temperature. Calculate the work done on the gas.
Correct A. -1.00 kJ
B. -2.00 kJ
C. -3.00 kJ
D. -4.00 kJ

Correct Answer: A

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Question 10 View Details
A 2.00 M solution of NaOH is titrated with 1.00 M HCl. Calculate the pH of the solution after 25.0 mL of HCl has been added.
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 11 View Details
Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). The s\tandard enthalpy of formation for Al2O3(s) is -1675 kJ/mol, and the s\tandard enthalpy of formation for Fe2O3(s) is -824 kJ/mol. The s\tandard enthalpy of formation for Al(s) is 0 kJ/mol, and the s\tandard enthalpy of formation for Fe(s) is 0 kJ/mol.
A. 0 kJ/mol
Correct B. -1799 kJ/mol
C. -1791 kJ/mol
D. -1793 kJ/mol

Correct Answer: B

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Question 12 View Details
A 2.50 L flask contains 0.250 mol of N2 gas at 298 K. Calculate the partial pressure of N2 gas in the flask.
Correct A. 0.101 kPa
B. 0.202 kPa
C. 0.303 kPa
D. 0.404 kPa

Correct Answer: A

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Question 13 View Details
A 1.00 g sample of a non-metallic element has a mass of 1.00 g. If the density of the element is 4.00 g/cm^3, what is the volume of the sample?
A. 0.250 cm^3
B. 0.500 cm^3
Correct C. 1.00 cm^3
D. 2.00 cm^3

Correct Answer: C

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Question 14 View Details
A 500 mL solution contains 0.250 M NaOH. Calculate the number of moles of NaOH in the solution.
A. 0.125 mol
Correct B. 0.250 mol
C. 0.375 mol
D. 0.500 mol

Correct Answer: B

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Question 15 View Details
A 1.00 L flask contains 0.500 mol of CO2 gas at 298 K. Calculate the partial pressure of CO2 gas in the flask.
A. 0.101 kPa
Correct B. 0.202 kPa
C. 0.303 kPa
D. 0.404 kPa

Correct Answer: B

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Question 16 View Details
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
Correct A. -1206.0 kJ/mol
B. -1206.5 kJ/mol
C. -1207.0 kJ/mol
D. -1207.5 kJ/mol

Correct Answer: A

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Question 17 View Details
A 2.5 M solution of HCl is mixed with a 1.0 M solution of NaOH. Calculate the number of moles of HCl that react with NaOH.
A. 0.005 mol
Correct B. 0.01 mol
C. 0.015 mol
D. 0.02 mol

Correct Answer: B

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Question 18 View Details
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.0 mol of C6H12O6(s).
Correct A. -2800.0 kJ/mol
B. -2800.5 kJ/mol
C. -2801.0 kJ/mol
D. -2801.5 kJ/mol

Correct Answer: A

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Question 19 View Details
A 0.5 M solution of FeCl3 is mixed with a 0.1 M solution of NaOH. Calculate the number of moles of FeCl3 that react with NaOH.
A. 0.0015 mol
Correct B. 0.0025 mol
C. 0.0035 mol
D. 0.0045 mol

Correct Answer: B

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Question 20 View Details
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
Correct A. -1206.0 kJ/mol
B. -1206.5 kJ/mol
C. -1207.0 kJ/mol
D. -1207.5 kJ/mol

Correct Answer: A

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Question 21 View Details
The rate cons\tant of a first-order reaction is given by \( k = Ae^{-E_a/RT} \). If the activation energy \( E_a \) is 100 kJ/mol, the gas cons\tant ( R ) is 8.314 J/(mol·K), and the temperature ( T ) is 300 K, what is the value of the pre-exponential factor ( A ) if the rate cons\tant ( k ) is 0.05 s\( ^{-1} \)?
Correct A. \( 1.23 \times 10^{10} \)
B. \( 1.23 \times 10^{11} \)
C. \( 1.23 \times 10^{12} \)
D. \( 1.23 \times 10^{13} \)

Correct Answer: A

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Question 22 View Details
A 2.5 L flask contains 0.15 mol of an ideal gas at 298 K. What is the pressure of the gas in the flask?
A. \( 1.01 \times 10^{5} \) Pa
Correct B. \( 2.02 \times 10^{5} \) Pa
C. \( 3.03 \times 10^{5} \) Pa
D. \( 4.04 \times 10^{5} \) Pa

Correct Answer: B

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Question 23 View Details
A solution contains 0.020 M HCl and 0.030 M NaOH. What is the pH of the solution?
A. ( 2.0 )
Correct B. ( 3.0 )
C. ( 4.0 )
D. ( 5.0 )

Correct Answer: B

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Question 24 View Details
A 0.50 M solution of NaOH is mixed with a 0.75 M solution of HCl. What is the resulting concentration of NaOH?
Correct A. ( 0.25 ) M
B. ( 0.50 ) M
C. ( 0.75 ) M
D. ( 1.0 ) M

Correct Answer: A

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Question 25 View Details
A 2.0 L flask contains 0.10 mol of an ideal gas at 298 K. What is the pressure of the gas in the flask?
A. \( 1.01 \times 10^{5} \) Pa
Correct B. \( 2.02 \times 10^{5} \) Pa
C. \( 3.03 \times 10^{5} \) Pa
D. \( 4.04 \times 10^{5} \) Pa

Correct Answer: B

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