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POST UTME BSU 2020 Chemistry | Objective

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Question 1

Determine the pH of a 0.1 M solution of HCl in water at 25°C. The dissociation cons\tant of HCl is 10^\( -7 \).

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 2

A 25 mL sample of a 0.5 M solution of NaOH is mixed with 50 mL of a 0.1 M solution of HCl. Calculate the pH of the resulting solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 3

A diagram of a titration setup is shown below. If 25 mL of 0.1 M HCl is added to 25 mL of 0.1 M NaOH, what is the pH of the resulting solution?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 4

A 1 L solution of 0.1 M HCl is mixed with 1 L of 0.1 M NaOH. What is the resulting pH?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 5

A diagram of a titration setup is shown below. If 25 mL of 0.1 M HCl is added to 25 mL of 0.1 M NaOH, what is the pH of the resulting solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 6

A sample of a gas at 25°C and 1 atm is heated to 50°C. What is the new volume of the gas, assuming ideal behavior?

A. 0.5 L

Correct B. 1.0 L

C. 2.0 L

D. 4.0 L

Correct Answer: B

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Question 7

A solution of NaOH is titrated with HCl. The initial pH of the solution is 12. What is the pH after the addition of 25 mL of 1 M HCl?

A. 6.0

Correct B. 7.0

C. 8.0

D. 9.0

Correct Answer: B

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Question 8

A catalyst is added to a reaction mixture. The rate of reaction increases by a factor of 2. What is the effect on the activation energy of the reaction?

A. Increases by a factor of 2

B. Decreases by a factor of 2

Correct C. Remains unchanged

D. Increases by a factor of 4

Correct Answer: C

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Question 9

A solution of AgNO3 is mixed with a solution of NaCl. The resulting precipitate is AgCl. What is the molar ratio of AgNO3 to NaCl?

Correct A. 1:1

B. 1:2

C. 2:1

D. 3:1

Correct Answer: A

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Question 10

A solution of H2SO4 is titrated with a solution of NaOH. The initial pH of the solution is 2. What is the pH after the addition of 50 mL of 1 M NaOH?

A. 4.0

B. 5.0

C. 6.0

Correct D. 7.0

Correct Answer: D

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Question 11

A sample of an ideal gas at 25°C and 1 atm is heated to 50°C at cons\tant pressure. What is the ratio of the final volume to the initial volume?

A. 2

Correct B. 1

C. 3

D. 4

Correct Answer: B

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Question 12

The element with atomic number 16 is

Correct A. Sulfur

B. Phosphorus

C. Selenium

D. Tellurium

Correct Answer: A

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Question 13

A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. 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 14

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

Correct A. To measure the volume of the solution

B. To measure the pH of the solution

C. To measure the temperature of the solution

D. To measure the density of the solution

Correct Answer: A

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Question 15

The compound with the molecular formula C2H6O is

Correct A. Ethanol

B. Methanol

C. Propanol

D. Acetaldehyde

Correct Answer: A

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Question 16

Determine the number of moles of oxygen gas (O2) required to completely combust 2.5 moles of propane (C3H8) according to the balanced equation: 2C3H8 + 19O2 → 12CO2 + 14H2O.

A. 0.5 moles

Correct B. 1.0 mole

C. 1.5 moles

D. 2.0 moles

Correct Answer: B

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Question 17

A sample of a polymer has a molecular weight of 50000 g/mol. If 2.5 g of the polymer is dissolved in 50 mL of a solvent, what is the concentration of the solution in g/L?

A. 0.05 g/L

B. 0.5 g/L

Correct C. 5.0 g/L

D. 50 g/L

Correct Answer: C

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Question 18

A 0.1 M solution of hydrochloric acid (HCl) is titrated with a 0.1 M solution of sodium hydroxide (NaOH). If 20 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?

A. 10 mL

Correct B. 20 mL

C. 30 mL

D. 40 mL

Correct Answer: B

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Question 19

A sample of nitrogen gas (N2) is collected over water at a temperature of 25°C and a pressure of 1 atm. If the partial pressure of water vapor is 0.02 atm, what is the partial pressure of N2?

A. 0.98 atm

B. 0.99 atm

Correct C. 1.00 atm

D. 1.01 atm

Correct Answer: C

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Question 20

A 2.0 M solution of ethanol (C2H5OH) is mixed with a 2.0 M solution of acetic acid (CH3COOH). If the resulting solution has a pH of 4.5, what is the concentration of the resulting solution?

A. 1.0 M

Correct B. 1.5 M

C. 2.0 M

D. 2.5 M

Correct Answer: B

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Question 21

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.

A. -110.5 kJ/mol

B. -110.5 kJ/mol

C. -110.5 kJ/mol

Correct D. -110.5 kJ/mol

Correct Answer: D

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Question 22

A 0.500 M solution of NaCl is electrolyzed u\sing a platinum electrode. If the cell potential is 2.71 V, calculate the number of moles of Cl2 produced at the anode.

A. 0.0025 mol

B. 0.0025 mol

C. 0.0025 mol

Correct D. 0.0025 mol

Correct Answer: D

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Question 23

The molar mass of a polymer is 200 g/mol. If 1.00 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?

A. 2.00 g/L

B. 2.00 g/L

C. 2.00 g/L

Correct D. 2.00 g/L

Correct Answer: D

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Question 24

A 1.00 M solution of HCl is titrated with a 1.00 M solution of NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the volume of HCl required to reach the equivalence point?

A. 25.0 mL

B. 25.0 mL

C. 25.0 mL

Correct D. 25.0 mL

Correct Answer: D

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Question 25

The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO2(g) if the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.

A. -393.5 kJ/mol

B. -393.5 kJ/mol

C. -393.5 kJ/mol

Correct D. -393.5 kJ/mol

Correct Answer: D

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