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POST UTME MOUNTAIN TOP UNIVERSITY 2023 Chemistry | Objective

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Question 1 View Details

Determine the s\tandard Gibbs free energy change (ΔG°) for the reaction: 2NO(g) + O2(g) → 2NO2(g) at 298 K and 1 atm, given that ΔH° = -114.1 kJ/mol and ΔS° = 137.2 J/mol·K.

A. -114.1 kJ/mol

Correct B. -114.1 kJ/mol + 137.2 J/mol·K

C. -114.1 kJ/mol - 137.2 J/mol·K

D. -114.1 kJ/mol + 137.2 kJ/mol·K

Correct Answer: B

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Question 2 View Details

A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in 1.00 L of water. What is the concentration of OH- ions in the solution?

Correct A. 0.500 M

B. 0.250 M

C. 1.00 M

D. 2.00 M

Correct Answer: A

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Question 3 View Details

The diagram below shows a titration setup for determining the concentration of a strong acid.

Correct A. HCl

B. H2SO4

C. HNO3

D. H3PO4

Correct Answer: A

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Question 4 View Details

A sample of a gas at 25°C and 1 atm has a volume of 2.50 L. What is the pressure of the gas at 50°C and 3.00 atm?

A. 3.00 atm

Correct B. 4.00 atm

C. 5.00 atm

D. 6.00 atm

Correct Answer: B

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Question 5 View Details

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?

A. -110.5 kJ/mol

Correct B. -110.5 kJ/mol + 393.5 kJ/mol

C. -110.5 kJ/mol - 393.5 kJ/mol

D. -110.5 kJ/mol + 393.5 kJ/mol

Correct Answer: B

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Question 6 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 7 View Details

A sample of copper metal is heated in a stream of oxygen gas. What is the resulting compound?

Correct A. CuO

B. Cu2O

C. Cu(OH)2

D. CuCl2

Correct Answer: A

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Question 8 View Details

A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. What is the pressure of the gas?

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 9 View Details

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 10 View Details

A 1.0 L flask contains 0.5 mol of an ideal gas at 50°C. What is the pressure of the gas?

A. 2.0 atm

B. 2.5 atm

Correct C. 3.0 atm

D. 3.5 atm

Correct Answer: C

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Question 11 View Details

Determine the pH of a 0.1 M solution of HCl.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 12 View Details

Calculate the molar mass of a compound with the empirical formula C2H4O.

A. 28

B. 40

Correct C. 56

D. 72

Correct Answer: C

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Question 13 View Details

A 25 mL sample of a solution containing 0.5 M H2SO4 is titrated with 1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 25 mL

B. 50 mL

C. 75 mL

Correct D. 100 mL

Correct Answer: D

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Question 14 View Details

A 10 g sample of a subs\tance is found to have a mass of 5 g after being placed in a beaker and heated to 100°C. Calculate the mass of water lost by the subs\tance.

Correct A. 2 g

B. 5 g

C. 8 g

D. 10 g

Correct Answer: A

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Question 15 View Details

A diagram of a titration setup is shown below. What is the purpose of the burette?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To filter the solution

Correct Answer: A

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Question 16 View Details

The rate cons\tant (k) for a first-order reaction is related to the half-life \( t1/2 \) by the equation: k = ln(2) / t1/2. If the half-life of a reaction is 10 minutes, what is the rate cons\tant (k) in min^-1?

Correct A. 0.0693

B. 0.693

C. 6.93

D. 69.3

Correct Answer: A

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Question 17 View Details

A solution contains 0.1 M NaOH and 0.1 M HCl. What is the pH of the solution after mixing?

Correct A. 7

B. 6

C. 5

D. 4

Correct Answer: A

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Question 18 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 solution in g/L?

Correct A. 1000

B. 100

C. 10

D. 1

Correct Answer: A

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Question 19 View Details

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?

Correct A. 7

B. 6

C. 5

D. 4

Correct Answer: A

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Question 20 View Details

A solution contains 0.1 M NaOH and 0.1 M HCl. What is the concentration of the solution after mixing?

A. 0.1

Correct B. 0.2

C. 0.3

D. 0.4

Correct Answer: B

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Question 21 View Details

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?

Correct A. 7

B. 6

C. 5

D. 4

Correct Answer: A

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Question 22 View Details

A solution contains 0.1 M NaOH and 0.1 M HCl. What is the concentration of the solution after mixing?

A. 0.1

Correct B. 0.2

C. 0.3

D. 0.4

Correct Answer: B

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Question 23 View Details

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?

Correct A. 7

B. 6

C. 5

D. 4

Correct Answer: A

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Question 24 View Details

A solution contains 0.1 M NaOH and 0.1 M HCl. What is the concentration of the solution after mixing?

A. 0.1

Correct B. 0.2

C. 0.3

D. 0.4

Correct Answer: B

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Question 25 View Details

A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution after mixing?

Correct A. 7

B. 6

C. 5

D. 4

Correct Answer: A

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