POST UTME BOWEN UNIVERSITY 2023 Chemistry | Objective

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Question 1 View Details
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, ΔHf(C(s)) = 0 kJ/mol.
Correct A. -1206.60 kJ/mol
B. -1206.19 kJ/mol
C. -1206.79 kJ/mol
D. -1206.91 kJ/mol

Correct Answer: A

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Question 2 View Details
A 2.5 M solution of HCl is mixed with a 1.5 M solution of NaOH. Calculate the pH of the resulting solution.
A. 2.50
Correct B. 2.75
C. 3.00
D. 3.25

Correct Answer: B

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Question 3 View Details
The diagram below shows the structure of a molecule. Identify the type of bond between atoms A and B.
A. Sigma (σ) bond
B. Pi (π) bond
Correct C. Sigma (σ) and Pi (π) bond
D. Hydrogen bond

Correct Answer: C

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Question 4 View Details
A 0.1 M solution of FeCl3 is mixed with a 0.2 M solution of NaOH. Calculate the concentration of Fe(OH)3(s) formed.
A. 0.05 M
Correct B. 0.10 M
C. 0.15 M
D. 0.20 M

Correct Answer: B

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Question 5 View Details
The diagram below shows the structure of a cell. Identify the part labeled C.
A. Mitochondria
Correct B. Nucleus
C. Cytoplasm
D. Lysosome

Correct Answer: B

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Question 6 View Details
The rate cons\tant (k) 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 7 View Details
A metal oxide has the formula MO2. If the molar mass of the metal (M) is 50 g/mol, what is the molar mass of the oxide?
A. 126 g/mol
Correct B. 128 g/mol
C. 130 g/mol
D. 132 g/mol

Correct Answer: B

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Question 8 View Details
A gas occupies a volume of 2 L at a pressure of 1 atm. If the temperature is increased to 300 K, what is the new volume?
A. 2.5 L
Correct B. 3 L
C. 3.5 L
D. 4 L

Correct Answer: B

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Question 9 View Details
A solution contains 10 g of NaCl in 100 mL of water. What is the molarity of the solution?
Correct A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

Correct Answer: A

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Question 10 View Details
A metal has a density of 8 g/cm^3. If a 2 cm^3 sample has a mass of 16 g, what is the molar mass of the metal?
A. 100 g/mol
Correct B. 200 g/mol
C. 300 g/mol
D. 400 g/mol

Correct Answer: B

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Question 11 View Details
Determine the pH of a 0.1 M solution of HCl if 25 mL of 1 M NaOH is added to 50 mL of the HCl solution.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 12 View Details
A 2.5 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide. If the mass of the metal oxide is 2.0 g, calculate the percentage yield of the metal oxide.
A. 60%
B. 70%
Correct C. 80%
D. 90%

Correct Answer: C

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Question 13 View Details
A solution containing 0.1 M HCl and 0.1 M NaOH is mixed. Calculate the pH of the resulting solution.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 14 View Details
A 1.0 M solution of HCl is titrated with 1.0 M NaOH. If 25 mL of NaOH is required to reach the equivalence point, calculate the volume of HCl required to reach the equivalence point.
A. 50 mL
B. 75 mL
Correct C. 100 mL
D. 125 mL

Correct Answer: C

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Question 15 View Details
A 2.0 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide. If the mass of the metal oxide is 1.8 g, calculate the percentage yield of the metal oxide.
A. 80%
B. 90%
Correct C. 95%
D. 98%

Correct Answer: C

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