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POST UTME FUTA 2024 Chemistry | Objective

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Question 1

A 0.5 M solution of AgNO3 is mixed with a 0.5 M solution of NaCl. If the reaction is allowed to go to completion, what is the concentration of AgCl that will precipitate out of the solution?

A. 0.5 M

Correct B. 0.25 M

C. 1.0 M

D. 0.75 M

Correct Answer: B

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Question 2

A sample of CO2 gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the vapor pressure of water at 25°C is 0.0313 atm, what is the partial pressure of CO2 in the sample?

Correct A. 0.9687 atm

B. 0.0313 atm

C. 0.9687 atm

D. 1.0 atm

Correct Answer: A

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Question 3

A reaction is represented by the equation: 2A + B → 2C + D. If 2.0 mol of A and 1.0 mol of B are mixed, what is the limiting reac\tant?

Correct A. A

B. B

C. C

D. D

Correct Answer: A

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Question 4

A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. If the reaction is allowed to go to completion, what is the pH of the resulting solution?

A. 1.0

Correct B. 2.0

C. 3.0

D. 4.0

Correct Answer: B

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Question 5

A sample of a gas has a volume of 2.0 L at a temperature of 25°C and a pressure of 1 atm. If the temperature is increased to 50°C and the pressure is increased to 2 atm, what is the new volume of the gas?

Correct A. 4.0 L

B. 2.0 L

C. 1.0 L

D. 0.5 L

Correct Answer: A

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Question 6

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CO(g) and O2(g) from the following equation: CO2(g) → CO(g) + 1/2O2(g).

A. -110.5 kJ/mol

Correct B. -110.5 kJ/mol

C. -110.5 kJ/mol

D. -110.5 kJ/mol

Correct Answer: B

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Question 7

A 0.500 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. 2.00

Correct B. 2.00

C. 2.00

D. 2.00

Correct Answer: B

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Question 8

A sample of a gas has a volume of 2.50 L at a pressure of 1.00 atm. What is the volume of the gas at a pressure of 3.00 atm, assuming the temperature remains cons\tant?

A. 1.67 L

Correct B. 1.67 L

C. 1.67 L

D. 1.67 L

Correct Answer: B

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Question 9

A solution contains 0.100 M HCl and 0.100 M NaOH. What is the pH of the solution?

A. 7.00

Correct B. 7.00

C. 7.00

D. 7.00

Correct Answer: B

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Question 10

A 0.500 M solution of HCl is titrated with 0.500 M NaOH. What is the pH of the solution after 50.0 mL of NaOH has been added?

A. 2.00

Correct B. 2.00

C. 2.00

D. 2.00

Correct Answer: B

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Question 11

In a typical titration experiment, what is the primary function 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 12

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

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 13

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

Correct A. To hold the burette in place

B. To mix the titrant and analyte

C. To measure the volume of the titrant

D. To filter the solution

Correct Answer: A

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Question 14

A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the concentration of the resulting solution after 25 mL of HCl has been added?

A. 0.05 M

B. 0.1 M

Correct C. 0.15 M

D. 0.2 M

Correct Answer: C

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Question 15

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

A. To measure the volume of the titrant

B. To mix the titrant and analyte

Correct C. To measure the volume of the analyte

D. To filter the solution

Correct Answer: C

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Question 16

The solubility of a sparingly soluble salt, AgCl, in water is 1.2 × 10^\( -5 \) mol/L at 25°C. Calculate the molar solubility of AgCl in a 0.1 M NaCl solution at the same temperature.

Correct A. 1.2 × 10^\( -6 \) mol/L

B. 1.2 × 10^\( -5 \) mol/L

C. 1.2 × 10^\( -4 \) mol/L

D. 1.2 × 10^\( -3 \) mol/L

Correct Answer: A

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Question 17

A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. Calculate the work done by the gas when it expands to 5 L at the same temperature.

Correct A. 1.4 kJ

B. 2.5 kJ

C. 3.5 kJ

D. 4.5 kJ

Correct Answer: A

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Question 18

The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance is initially present, how much will remain after 20 years?

Correct A. 6.25 g

B. 12.5 g

C. 25 g

D. 50 g

Correct Answer: A

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Question 19

A 0.1 M solution of HCl is mixed with a 0.1 M solution of NaOH. Calculate the pH of the resulting solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 20

A metal rod of length 1 m is heated from 20°C to 100°C. Calculate the change in entropy of the rod.

Correct A. 1.2 J/K

B. 2.2 J/K

C. 3.2 J/K

D. 4.2 J/K

Correct Answer: A

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Question 21

The rate cons\tant (k) for a first-order reaction is given by the equation: k = Ae^\( -Ea/RT \). If the activation energy (Ea) is 100 kJ/mol, the gas cons\tant (R) is 8.314 J/mol*K, and the temperature (T) is 300 K, what is the value of the rate cons\tant (k) if the pre-exponential factor (A) is 1.0 x 10^10 s^-1?

A. 1.0 x 10^5 s^-1

B. 1.0 x 10^6 s^-1

C. 1.0 x 10^7 s^-1

Correct D. 1.0 x 10^8 s^-1

Correct Answer: D

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Question 22

A 2.5 g sample of a metal is dissolved in 50 mL of 0.1 M HCl. If the metal is a member of the 3d transition series, what is the number of moles of the metal that reacted with the acid?

A. 0.05 mol

Correct B. 0.10 mol

C. 0.15 mol

D. 0.20 mol

Correct Answer: B

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Question 23

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. If 2.5 mol of CO2 is produced at 298 K, what is the total energy change (ΔH) for the reaction?

Correct A. -987.5 kJ

B. -993.5 kJ

C. -998.5 kJ

D. -1003.5 kJ

Correct Answer: A

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Question 24

A sample of a metal oxide has a mass of 25 g and a volume of 10 mL. If the density of the metal oxide is 5.0 g/mL, what is the molar mass of the metal oxide?

A. 100 g/mol

B. 150 g/mol

Correct C. 200 g/mol

D. 250 g/mol

Correct Answer: C

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Question 25

A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. If 50 mL of each solution is used, what is the pH of the resulting solution?

A. 1.0

B. 2.0

C. 3.0

Correct D. 4.0

Correct Answer: D

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