POST UTME DELSU 2024 Chemistry | Objective

Are you preparing for POST UTME DELSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol.
Correct A. -1206.60 kJ/mol
B. -1206.60 kJ/mol
C. -1206.60 kJ/mol
D. -1206.60 kJ/mol

Correct Answer: A

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Question 2
A 0.500 M solution of NaCl is prepared by dissolving 2.50 g of NaCl in 500 mL of water. What is the concentration of Na+ ions in the solution?
Correct A. 0.500 M
B. 0.500 M
C. 0.500 M
D. 0.500 M

Correct Answer: A

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Question 3
A sample of a polymer has a molecular weight of 50,000 g/mol. If 1.00 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the polymer in g/L?
Correct A. 0.500 g/L
B. 0.500 g/L
C. 0.500 g/L
D. 0.500 g/L

Correct Answer: A

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Question 4
A 2.00 M solution of HCl is prepared by dissolving 40.0 g of HCl in 1.00 L of water. What is the concentration of H+ ions in the solution?
Correct A. 2.00 M
B. 2.00 M
C. 2.00 M
D. 2.00 M

Correct Answer: A

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Question 5
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is added to 25.0 mL of 0.100 M HCl, what is the concentration of the resulting solution?
Correct A. 0.0500 M
B. 0.0500 M
C. 0.0500 M
D. 0.0500 M

Correct Answer: A

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Question 6
Calculate the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol, and ΔHf(C(s)) = 0 kJ/mol.
Correct A. -179.18 kJ/mol
B. -178.18 kJ/mol
C. -179.51 kJ/mol
D. -178.51 kJ/mol

Correct Answer: A

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Question 7
A metal M reacts with chlorine gas to form a white solid MX. The reaction is as follows: M(s) + Cl2(g) → MX(s). If 2.50 g of M(s) reacts with 1.00 g of Cl2(g) to form 3.00 g of MX(s), calculate the molar mass of M.
A. 40.00 g/mol
Correct B. 50.00 g/mol
C. 60.00 g/mol
D. 70.00 g/mol

Correct Answer: B

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Question 8
The s\tandard enthalpy of formation of NO(g) is -90.29 kJ/mol. Calculate the s\tandard enthalpy of formation of N2O(g) from the following data: ΔHf(N2(g)) = 0 kJ/mol and ΔHf(O2(g)) = 0 kJ/mol.
Correct A. -82.05 kJ/mol
B. -90.29 kJ/mol
C. -98.29 kJ/mol
D. -106.29 kJ/mol

Correct Answer: A

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Question 9
A 2.00 M solution of HCl(aq) is mixed with a 2.00 M solution of NaOH(aq). If 25.0 mL of each solution is used, calculate 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 10
The s\tandard enthalpy of formation of CO2(g) is -393.51 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol and ΔHf(C(s)) = 0 kJ/mol.
A. -178.51 kJ/mol
Correct B. -179.51 kJ/mol
C. -180.51 kJ/mol
D. -181.51 kJ/mol

Correct Answer: B

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Question 11
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH in a 1:1 ratio. What is the pH of the resulting solution?
A. 7
B. 10
C. 14
Correct D. 0

Correct Answer: D

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Question 12
A sample of CO2 is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of CO2 in the gas mixture?
A. 0.5 atm
B. 0.75 atm
Correct C. 1 atm
D. 1.5 atm

Correct Answer: C

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Question 13
A 2.0 g sample of a polymer is dissolved in 100 mL of a solvent. The resulting solution has a vis\cosity of 0.5 Pa·s. What is the molar mass of the polymer?
A. 1000 g/mol
Correct B. 2000 g/mol
C. 5000 g/mol
D. 10000 g/mol

Correct Answer: B

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Question 14
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH in a 1:1 ratio. What is the resulting solution?
Correct A. NaCl
B. HCl
C. NaOH
D. H2O

Correct Answer: A

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Question 15
A sample of CO2 is collected over water at a temperature of 25°C and a pressure of 1 atm. What is the partial pressure of CO2 in the gas mixture?
A. 0.5 atm
B. 0.75 atm
Correct C. 1 atm
D. 1.5 atm

Correct Answer: C

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Question 16
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 CO2(g) from CO(g) and 1/2 O2(g) is -393.5 kJ/mol.
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
Correct D. -110.5 kJ/mol

Correct Answer: D

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Question 17
A 0.1 M solution of a weak base, B, has a pH of 9.5. Calculate the value of Kb for the base.
A. 1.3 x 10^-5
B. 1.3 x 10^-5
C. 1.3 x 10^-5
Correct D. 1.3 x 10^-5

Correct Answer: D

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Question 18
A 2.5 g sample of a polymer, P, has a molecular weight of 500 g/mol. Calculate the number of moles of P in the sample.
A. 0.005 mol
B. 0.005 mol
C. 0.005 mol
Correct D. 0.005 mol

Correct Answer: D

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Question 19
A solution of a weak acid, HA, has a pH of 4.5. Calculate the value of Ka for the acid.
A. 1.3 x 10^-5
B. 1.3 x 10^-5
C. 1.3 x 10^-5
Correct D. 1.3 x 10^-5

Correct Answer: D

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Question 20
A 0.1 M solution of a strong base, B, has a pH of 12.5. Calculate the value of Kb for the base.
A. 1.3 x 10^-5
B. 1.3 x 10^-5
C. 1.3 x 10^-5
Correct D. 1.3 x 10^-5

Correct Answer: D

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Question 21
A 2.5 g sample of a polymer, P, has a molecular weight of 500 g/mol. Calculate the number of moles of P in the sample.
A. 0.005 mol
B. 0.005 mol
C. 0.005 mol
Correct D. 0.005 mol

Correct Answer: D

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Question 22
A solution of a weak acid, HA, has a pH of 4.5. Calculate the value of Ka for the acid.
A. 1.3 x 10^-5
B. 1.3 x 10^-5
C. 1.3 x 10^-5
Correct D. 1.3 x 10^-5

Correct Answer: D

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Question 23
A 0.1 M solution of a strong base, B, has a pH of 12.5. Calculate the value of Kb for the base.
A. 1.3 x 10^-5
B. 1.3 x 10^-5
C. 1.3 x 10^-5
Correct D. 1.3 x 10^-5

Correct Answer: D

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Question 24
A 2.5 g sample of a polymer, P, has a molecular weight of 500 g/mol. Calculate the number of moles of P in the sample.
A. 0.005 mol
B. 0.005 mol
C. 0.005 mol
D. 0.005 mol

Correct Answer: VIEW ANSWER

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Question 25
The reaction between nitrogen dioxide and water is represented by the equation: 3NO2 + H2O → 2HNO3 + NO. If 2.5 moles of NO2 react with excess water, what is the limiting reac\tant?
Correct A. NO2
B. H2O
C. HNO3
D. NO

Correct Answer: A

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