POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2025 Chemistry | Objective

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Question 1 View Details
Determine the major product of the reaction between 2-methylpropene and HCl.
A. 1-chloro-2-methylpropane
B. 2-chloro-2-methylpropane
Correct C. 1-chloro-2-methylpropane and 2-chloro-2-methylpropane
D. 2-chloro-2-methylpropane and 1-chloro-2-methylpropane

Correct Answer: C

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Question 2 View Details
The s\tandard Gibbs free energy change for the reaction 2Ag+ + Cu → 2Ag + Cu2+ is -0.46 eV. What is the equilibrium cons\tant for this reaction?
Correct A. 10^\( -0.46 \)
B. 10^(0.46)
C. 10^\( -1.46 \)
D. 10^(1.46)

Correct Answer: A

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Question 3 View Details
A 2.5 M solution of a weak acid HA has a pH of 4.5. What is the concentration of the acid?
A. 0.01 M
Correct B. 0.1 M
C. 0.5 M
D. 1 M

Correct Answer: B

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Question 4 View Details
A gas at 300 K has a volume of 2.5 L. If the temperature is increased to 400 K, what is the new volume?
A. 3.2 L
Correct B. 4.0 L
C. 4.8 L
D. 5.6 L

Correct Answer: B

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Question 5 View Details
A solution containing 0.1 M NaOH and 0.1 M HCl is mixed. What is the pH of the resulting solution?
Correct A. 7
B. 8
C. 9
D. 10

Correct Answer: A

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Question 6 View Details
Determine the number of unpaired electrons in the ground state of the chromium ion, Cr3+.
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 7 View Details
A 2.00 M solution of HCl is titrated with 0.500 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?
A. 1.00
B. 2.00
Correct C. 3.00
D. 4.00

Correct Answer: C

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Question 8 View Details
The diagram below shows a setup for electrolysis of water. What is the purpose of the U-tube?
A. To collect the gas produced at the cathode
B. To collect the gas produced at the anode
Correct C. To prevent the escape of gas
D. To prevent the entry of air

Correct Answer: C

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Question 9 View Details
A 1.00 M solution of NaOH is titrated with 0.500 M HCl. What is the pH of the solution after 50.0 mL of HCl has been added?
A. 1.00
B. 2.00
C. 3.00
Correct D. 4.00

Correct Answer: D

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Question 10 View Details
The diagram below shows a setup for electrolysis of water. What is the purpose of the salt bridge?
A. To prevent the mixing of the two solutions
Correct B. To allow the flow of ions between the two solutions
C. To prevent the escape of gas
D. To prevent the entry of air

Correct Answer: B

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Question 11 View Details
Determine the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 12 View Details
A 25 mL sample of 0.5 M acetic acid (CH3COOH) is titrated with 1 M sodium hydroxide (NaOH). Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.025
B. 0.05
C. 0.075
Correct D. 0.1

Correct Answer: D

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Question 13 View Details
The rate cons\tant (k) for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, calculate the concentration after 10 minutes.
A. 0.01
B. 0.02
C. 0.03
Correct D. 0.04

Correct Answer: D

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Question 14 View Details
A 2.5 L sample of a 0.2 M solution of sodium carbonate (Na2CO3) is mixed with 1.5 L of a 0.1 M solution of hydrochloric acid (HCl). Calculate the pH of the resulting solution.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

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Question 15 View Details
A 1.0 L sample of a 0.5 M solution of ammonia (NH3) is mixed with 2.0 L of a 0.2 M solution of hydrochloric acid (HCl). Calculate the concentration of the resulting solution.
A. 0.1
B. 0.2
C. 0.3
Correct D. 0.4

Correct Answer: D

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Question 16 View Details
Determine the number of moles of sulfur trioxide (SO3) produced when 2.50 g of sulfur (S) is burned in the presence of oxygen (O2) according to the equation: 2S + 3O2 → 2SO3.
A. 0.0500 mol
B. 0.100 mol
Correct C. 0.150 mol
D. 0.200 mol

Correct Answer: C

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Question 17 View Details
A 0.500 L sample of a 0.200 M solution of sodium hydroxide (NaOH) is titrated with a 0.500 M solution of hydrochloric acid (HCl). What is the pH of the resulting solution after the reaction is complete?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

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Question 18 View Details
A sample of a hydrocarbon \( C_xH_y \) has a molecular weight of 42.0 g/mol. If the density of the sample is 0.800 g/mL, what is the volume (in mL) of 1.00 g of the sample?
A. 25.0 mL
Correct B. 50.0 mL
C. 75.0 mL
D. 100 mL

Correct Answer: B

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Question 19 View Details
A 2.00 g sample of a nonmetal (X) is burned in the presence of oxygen (O2) to produce 3.00 g of X2O3. What is the empirical formula of the nonmetal?
Correct A. X2O3
B. XO2
C. X2O
D. XO

Correct Answer: A

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Question 20 View Details
A 0.500 M solution of a weak acid (HA) is titrated with a 0.500 M solution of a strong base (NaOH). What is the pH of the resulting solution after the reaction is complete?
A. 1.00
B. 2.00
C. 3.00
Correct D. 4.00

Correct Answer: D

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Question 21 View Details
Determine the molar mass of a polymer with the following composition: 60% polyethylene (C2H4), 20% polypropylene (C3H6), and 20% polyvinyl chloride (C2H3Cl).
A. 60 g/mol
Correct B. 80 g/mol
C. 100 g/mol
D. 120 g/mol

Correct Answer: B

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Question 22 View Details
A solution contains 0.5 M NaCl. What is the concentration of Cl- ions in the solution?
Correct A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M

Correct Answer: A

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Question 23 View Details
What is the pH of a solution with a pOH of 4.5?
A. 7.5
B. 8.5
C. 9.5
Correct D. 10.5

Correct Answer: D

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Question 24 View Details
A sample of a gas occupies 2.5 L at 25°C. What is the pressure of the gas?
Correct A. 101.3 kPa
B. 202.6 kPa
C. 303.9 kPa
D. 405.2 kPa

Correct Answer: A

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Question 25 View Details
A solution contains 0.1 M HCl. What is the concentration of H+ ions in the solution?
A. 0.05 M
Correct B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: B

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