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POST UTME WELLSPRING UNIVERSITY 2023 Chemistry | Objective

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Question 1

A mixture of 1.5 mol of H2(g) and 2.0 mol of O2(g) is heated to 500 K in a 5.0 L reaction vessel. Assuming ideal gas behavior, what is the partial pressure of H2(g) in the mixture?

A. 0.50 atm

Correct B. 0.75 atm

C. 1.00 atm

D. 1.25 atm

Correct Answer: B

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Question 2

A solution contains 0.20 M NH3 and 0.10 M NH4Cl. What is the concentration of OH- ions in the solution?

A. 0.01 M

B. 0.02 M

Correct C. 0.03 M

D. 0.04 M

Correct Answer: C

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Question 3

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol?

Correct A. -241.8 kJ/mol

B. -241.0 kJ/mol

C. -240.5 kJ/mol

D. -240.0 kJ/mol

Correct Answer: A

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Question 4

A 0.50 M solution of NaOH is mixed with a 0.25 M solution of HCl. What is the concentration of the resulting solution?

A. 0.25 M

B. 0.50 M

Correct C. 0.75 M

D. 1.00 M

Correct Answer: C

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Question 5

A 2.0 L reaction vessel contains 1.5 mol of CO(g) and 2.0 mol of H2(g) at 500 K. Assuming ideal gas behavior, what is the partial pressure of H2(g) in the mixture?

A. 0.50 atm

Correct B. 0.75 atm

C. 1.00 atm

D. 1.25 atm

Correct Answer: B

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Question 6

The reaction of cyclohexane with bromine in the presence of light produces a mixture of 1,2-dibromocyclohexane and 1,4-dibromocyclohexane. What is the major product of this reaction?

A. 1,2-dibromocyclohexane

Correct B. 1,4-dibromocyclohexane

C. cis-1,2-dibromocyclohexane

D. trans-1,4-dibromocyclohexane

Correct Answer: B

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Question 7

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol?

Correct A. -285.8 kJ/mol

B. -241.8 kJ/mol

C. -393.5 kJ/mol

D. -572.8 kJ/mol

Correct Answer: A

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Question 8

The rate cons\tant for 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 of the reac\tant after 10 minutes?

A. 0.01 M

Correct B. 0.02 M

C. 0.03 M

D. 0.04 M

Correct Answer: B

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Question 9

A solution contains 0.1 M NaCl and 0.1 M NaNO3. What is the concentration of Cl^- ions in 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

The diagram below shows a titration setup. 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 separate the titrant and analyte

Correct Answer: A

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Question 11

A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 100 mL of water. Calculate the molar concentration of the solution.

A. 0.6 M

B. 0.8 M

Correct C. 1.0 M

D. 1.2 M

Correct Answer: C

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Question 12

The half-life of a radioactive subs\tance is 5 days. If 100 mg of the subs\tance is initially present, how much will remain after 15 days?

Correct A. 12.5 mg

B. 25 mg

C. 50 mg

D. 100 mg

Correct Answer: A

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Question 13

A 2.0 M solution of hydrochloric acid (HCl) is prepared by dissolving 36.5 g of HCl in 100 mL of water. What is the pH of the solution?

A. 0.5

B. 1.0

Correct C. 2.0

D. 3.0

Correct Answer: C

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Question 14

A 1.0 M solution of sodium hydroxide (NaOH) is prepared by dissolving 40.0 g of NaOH in 100 mL of water. What is the pOH of the solution?

A. 0.5

Correct B. 1.0

C. 2.0

D. 3.0

Correct Answer: B

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Question 15

A 2.0 M solution of potassium chloride (KCl) is prepared by dissolving 74.5 g of KCl in 100 mL of water. What is the boiling point elevation of the solution?

A. 0.5°C

B. 1.0°C

Correct C. 2.0°C

D. 3.0°C

Correct Answer: C

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Question 16

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 17

A 2.5 g sample of a metal carbonate is treated with 20 mL of 2 M HCl. If 15 mL of the resulting solution requires 25 mL of 0.5 M NaOH for neutralization, calculate the molar mass of the metal.

A. 50

B. 60

Correct C. 70

D. 80

Correct Answer: C

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Question 18

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

A. 1

Correct B. 7

C. 10

D. 14

Correct Answer: B

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Question 19

A 100 mL sample of a 0.1 M solution of HCl is titrated with 0.1 M NaOH. What is the pH of the solution at the equivalence point?

A. 1

Correct B. 7

C. 10

D. 14

Correct Answer: B

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Question 20

A 2.5 g sample of a metal carbonate is treated with 20 mL of 2 M HCl. If 15 mL of the resulting solution requires 25 mL of 0.5 M NaOH for neutralization, calculate the molar mass of the metal.

A. 50

B. 60

Correct C. 70

D. 80

Correct Answer: C

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Question 21

The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). If 2.50 g of zinc metal is added to 250 mL of 0.100 M copper(II) sulfate solution, what is the limiting reac\tant?

Correct A. Zinc metal

B. Copper(II) sulfate solution

C. Neither, the reaction is in excess

D. Both reac\tants are in excess

Correct Answer: A

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Question 22

A 2.50 M solution of sodium hydroxide (NaOH) is prepared by dissolving 250 g of NaOH in 1.00 L of water. What is the concentration of the solution in terms of molarity?

A. 1.00 M

Correct B. 2.50 M

C. 5.00 M

D. 10.0 M

Correct Answer: B

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Question 23

The s\tandard reduction potential of the copper(II)/copper(I) couple is +0.52 V. If a copper(I) ion is reduced to copper metal at a potential of -0.15 V, what is the cell potential?

Correct A. +0.37 V

B. +0.52 V

C. +0.67 V

D. -0.15 V

Correct Answer: A

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Question 24

A 1.00 M solution of hydrochloric acid (HCl) is prepared by dissolving 36.5 g of HCl in 1.00 L of water. What is the concentration of the solution in terms of molarity?

A. 0.500 M

Correct B. 1.00 M

C. 2.00 M

D. 3.00 M

Correct Answer: B

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Question 25

The s\tandard reduction potential of the zinc/zinc ion couple is -0.76 V. If a zinc ion is reduced to zinc metal at a potential of +0.15 V, what is the cell potential?

Correct A. +0.41 V

B. +0.51 V

C. +0.61 V

D. -0.76 V

Correct Answer: A

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