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POST UTME PAN-ATLANTIC UNIVERSITY 2019 Chemistry | Objective

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Question 1

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 2

A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 3

A 10.0 g sample of a mixture of NaCl and KCl is dissolved in 100.0 mL of water. What is the molarity of the solution?

A. 0.1 M

B. 0.2 M

Correct C. 0.3 M

D. 0.4 M

Correct Answer: C

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Question 4

A 50.0 mL sample of 0.500 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 50.0 mL of NaOH?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 5

A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 6

A 0.1 M solution of a weak base, B, has a pH of 8. Determine the value of Kb.

Correct A. 1.0 x 10^-5

B. 1.0 x 10^-4

C. 1.0 x 10^-3

D. 1.0 x 10^-2

Correct Answer: A

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Question 7

A 2.0 g sample of a polymer is dissolved in 100 mL of solvent. If the solution has a vis\cosity of 0.5 Pa·s, what is the molar mass of the polymer?

A. 1000 g/mol

B. 2000 g/mol

Correct C. 5000 g/mol

D. 10000 g/mol

Correct Answer: C

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Question 8

A 1.0 M solution of HCl is titrated with a 1.0 M solution of NaOH. If 25 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?

A. 25 mL

Correct B. 50 mL

C. 75 mL

D. 100 mL

Correct Answer: B

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Question 9

A 0.1 M solution of a weak acid, HA, has a pH of 3. Determine the value of Ka.

A. 1.0 x 10^-3

B. 1.0 x 10^-4

Correct C. 1.0 x 10^-5

D. 1.0 x 10^-6

Correct Answer: C

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Question 10

A 1.0 M solution of NaOH is titrated with a 1.0 M solution of HCl. If 50 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?

A. 50 mL

Correct B. 75 mL

C. 100 mL

D. 125 mL

Correct Answer: B

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Question 11

Determine the s\tandard enthalpy of formation of CaO(s) from the following data: ΔH°f(CaO(s)) = ?; ΔH°f(Ca(s)) = -1.85 kJ/mol; ΔH°f(O2(g)) = 0 kJ/mol; ΔH°f(CaO(s)) = -635.09 kJ/mol.

A. -1.85 kJ/mol

B. -635.09 kJ/mol

Correct C. -1.85 kJ/mol + \( -635.09 kJ/mol \)

D. -1.85 kJ/mol + 0 kJ/mol

Correct Answer: C

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Question 12

A 2.50 M solution of HCl is titrated with 1.00 M NaOH. What is the pH of the solution after 25.0 mL of NaOH has been added?

A. 2.00

Correct B. 3.00

C. 4.00

D. 5.00

Correct Answer: B

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Question 13

The reaction 2NO(g) + O2(g) → 2NO2(g) has a rate cons\tant of 1.5 × 10^\( -3 \) s^\( -1 \) at 298 K. What is the rate of reaction when [NO] = 0.100 M and [O2] = 0.0500 M?

A. 1.5 × 10^\( -4 \) M/s

B. 3.0 × 10^\( -4 \) M/s

Correct C. 4.5 × 10^\( -4 \) M/s

D. 6.0 × 10^\( -4 \) M/s

Correct Answer: C

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Question 14

A 0.100 M solution of Fe^2+ is electrolyzed for 2.00 hours. What is the mass of Fe deposited at the cathode?

A. 0.0100 g

Correct B. 0.0200 g

C. 0.0300 g

D. 0.0400 g

Correct Answer: B

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Question 15

A 1.00 M solution of H2SO4 is titrated with 1.00 M NaOH. What is the pH of the solution after 50.0 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 16

Determine the pH of a 0.1 M solution of HCl at 25°C.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 17

Calculate the enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s). The s\tandard enthalpy of formation of Al2O3(s) is -1675 kJ/mol, and the s\tandard enthalpy of formation of Fe(s) is -13.8 kJ/mol.

Correct A. -1650 kJ/mol

B. -1700 kJ/mol

C. -1600 kJ/mol

D. -1800 kJ/mol

Correct Answer: A

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Question 18

A 0.1 M solution of NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 25 mL of HCl has been added.

A. 2

Correct B. 3

C. 4

D. 5

Correct Answer: B

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Question 19

A 0.1 M solution of H2SO4 is titrated with 0.1 M NaOH. Calculate the pH of the solution after 50 mL of NaOH has been added.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 20

A 0.1 M solution of NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 50 mL of HCl has been added.

A. 2

B. 3

Correct C. 4

D. 5

Correct Answer: C

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Question 21

A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. If the pH of the resulting solution is 7.00, what is the volume of NaOH added?

A. 10.0 mL

Correct B. 12.5 mL

C. 15.0 mL

D. 17.5 mL

Correct Answer: B

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Question 22

A polymer has a molecular weight of 50,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?

A. 100 g/mol

B. 200 g/mol

Correct C. 250 g/mol

D. 500 g/mol

Correct Answer: C

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Question 23

A 2.00 L sample of a gas at 25°C and 1.00 atm is compressed to 0.500 L at the same temperature. What is the new pressure?

A. 2.00 atm

B. 4.00 atm

Correct C. 6.00 atm

D. 8.00 atm

Correct Answer: C

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Question 24

A 10.0 mL sample of a 0.100 M solution of NaOH is added to 50.0 mL of a 0.100 M solution of HCl. What is 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 25

A 5.00 g sample of a polymer is dissolved in 100.0 mL of a solvent. What is the concentration of the polymer solution?

A. 0.0500 g/mL

Correct B. 0.100 g/mL

C. 0.150 g/mL

D. 0.200 g/mL

Correct Answer: B

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