Practice Post UTME FUTO chemistry 2023 Past Questions

Question 1

Determine the number of moles of oxygen gas (O2) produced at STP when 2.50 g of potassium chlorate (KClO3) decomposes according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).

A. 0.0500 mol

Correct B. 0.100 mol

C. 0.150 mol

D. 0.200 mol

Correct Answer: B

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Question 2

A 25.0-mL sample of 0.150 M NaOH is titrated with 0.100 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.

A. 0.00500 mol

Correct B. 0.0100 mol

C. 0.0150 mol

D. 0.0200 mol

Correct Answer: B

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Question 3

A diagram of a titration setup is shown below. If the burette contains 25.0 mL of 0.100 M HCl, and the initial pH of the solution is 7.00, what is the pH of the solution after 10.0 mL of 0.100 M NaOH has been added?

A. 7.00

B. 7.50

Correct C. 8.00

D. 9.00

Correct Answer: C

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Question 4

A 50.0-mL sample of 0.200 M H2SO4 is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.

A. 0.0100 mol

Correct B. 0.0200 mol

C. 0.0300 mol

D. 0.0400 mol

Correct Answer: B

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Question 5

A diagram of a titration setup is shown below. If the burette contains 25.0 mL of 0.100 M HCl, and the initial pH of the solution is 7.00, what is the pH of the solution after 15.0 mL of 0.100 M NaOH has been added?

A. 7.00

B. 7.50

C. 8.00

Correct D. 9.00

Correct Answer: D

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Question 6

The reaction between nitrogen dioxide and water is a complex process involving multiple steps. The overall reaction is: 3NO2 + H2O → 2HNO3 + NO. What is the value of ΔH° for this reaction, given that ΔH° for the formation of HNO3 is -173 kJ/mol and ΔH° for the formation of NO is 90 kJ/mol?

Correct A. -123 kJ/mol

B. -173 kJ/mol

C. 90 kJ/mol

D. 123 kJ/mol

Correct Answer: A

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Question 7

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. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 8

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

Correct A. -110.5 kJ/mol

B. -393.5 kJ/mol

C. 110.5 kJ/mol

D. 393.5 kJ/mol

Correct Answer: A

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Question 9

A 0.1 M solution of NaOH is titrated with 0.1 M HCl. What is the concentration of the 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 10

The s\tandard enthalpy of formation of H2O is -285.8 kJ/mol. What is the s\tandard enthalpy of formation of H2?

Correct A. -285.8 kJ/mol

B. -393.5 kJ/mol

C. 110.5 kJ/mol

D. 393.5 kJ/mol

Correct Answer: A

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Question 11

A solution of sodium carbonate (Na2CO3) is mixed with a solution of hydrochloric acid (HCl). The reaction is as follows: Na2CO3 + 2HCl → 2NaCl + H2O + CO2. If 25.0 cm3 of 0.100 M Na2CO3 is mixed with 25.0 cm3 of 0.100 M HCl, calculate the number of moles of CO2 produced.

A. 0.005 mol

Correct B. 0.010 mol

C. 0.015 mol

D. 0.020 mol

Correct Answer: B

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Question 12

A 2.50 M solution of sodium hydroxide (NaOH) is mixed with a 1.00 M solution of hydrochloric acid (HCl). The reaction is as follows: NaOH + HCl → NaCl + H2O. If 50.0 cm3 of 2.50 M NaOH is mixed with 50.0 cm3 of 1.00 M HCl, calculate 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 13

A 1.00 M solution of sodium carbonate (Na2CO3) is mixed with a 1.00 M solution of hydrochloric acid (HCl). The reaction is as follows: Na2CO3 + 2HCl → 2NaCl + H2O + CO2. If 50.0 cm3 of 1.00 M Na2CO3 is mixed with 50.0 cm3 of 1.00 M HCl, calculate the concentration of the resulting solution.

A. 0.500 M

B. 1.00 M

Correct C. 1.50 M

D. 2.00 M

Correct Answer: C

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Question 14

A 2.00 M solution of sodium hydroxide (NaOH) is mixed with a 1.00 M solution of hydrochloric acid (HCl). The reaction is as follows: NaOH + HCl → NaCl + H2O. If 50.0 cm3 of 2.00 M NaOH is mixed with 50.0 cm3 of 1.00 M HCl, calculate the number of moles of NaCl produced.

A. 0.050 mol

Correct B. 0.100 mol

C. 0.150 mol

D. 0.200 mol

Correct Answer: B

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Question 15

A 1.00 M solution of sodium carbonate (Na2CO3) is mixed with a 1.00 M solution of hydrochloric acid (HCl). The reaction is as follows: Na2CO3 + 2HCl → 2NaCl + H2O + CO2. If 50.0 cm3 of 1.00 M Na2CO3 is mixed with 50.0 cm3 of 1.00 M HCl, calculate the concentration of the resulting solution.

A. 0.500 M

B. 1.00 M

Correct C. 1.50 M

D. 2.00 M

Correct Answer: C

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Question 16

A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 100 mL of water. What is 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 17

A mixture of 2.5 g of glu\cose (C6H12O6) and 1.5 g of fructose (C6H12O6) is dissolved in 50 mL of water. What is the osmotic pressure of the solution at 25°C?

A. 2.5 atm

B. 3.0 atm

Correct C. 3.5 atm

D. 4.0 atm

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). What is the pH of the solution after the addition of 20 mL of NaOH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 19

A 2.0 g sample of a polymer is dissolved in 100 mL of solvent. What is the molar mass of the polymer if the osmotic pressure of the solution is 2.5 atm at 25°C?

A. 1000 g/mol

B. 2000 g/mol

Correct C. 3000 g/mol

D. 4000 g/mol

Correct Answer: C

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Question 20

A 0.1 M solution of acetic acid (CH3COOH) is titrated with a 0.1 M solution of sodium hydroxide (NaOH). What is the pH of the solution after the addition of 20 mL of NaOH?

A. 2

B. 3

Correct C. 4

D. 5

Correct Answer: C

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Question 21

A 0.5 M solution of a strong acid is titrated with 0.5 M NaOH. If 25 mL of the acid is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?

A. 12.5 mL

Correct B. 25 mL

C. 37.5 mL

D. 50 mL

Correct Answer: B

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Question 22

The half-life of a radioactive subs\tance is 5 years. If the initial amount of the subs\tance is 100 g, what is the amount remaining after 10 years?

A. 12.5 g

B. 25 g

Correct C. 50 g

D. 100 g

Correct Answer: C

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Question 23

A metal M reacts with chlorine gas to form a white solid. The reaction is as follows: M + Cl2 → MCl2. If 2.5 g of M is reacted with 1.5 g of Cl2, what is the limiting reac\tant?

A. M

Correct B. Cl2

C. Neither

D. Both

Correct Answer: B

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Question 24

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

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 25

A 2.0 M solution of NaOH is titrated with 1.0 M HCl. If 25 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?

A. 12.5 mL

Correct B. 25 mL

C. 37.5 mL

D. 50 mL

Correct Answer: B

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