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POST UTME FUTA 2025 Chemistry | Objective

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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. 0.125 mol

Correct B. 0.250 mol

C. 0.500 mol

D. 1.00 mol

Correct Answer: B

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Question 2

A sample of water (H2O) has a mass of 50.0 g. If the density of water is 1.00 g/mL, what is the volume of the sample in liters?

Correct A. 0.0500 L

B. 0.100 L

C. 0.500 L

D. 1.00 L

Correct Answer: A

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Question 3

The diagram below shows a titration setup. What is the purpose of the burette?

A. To measure the volume of the acid

Correct B. To measure the volume of the base

C. To mix the acid and base

D. To measure the pH of the solution

Correct Answer: B

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Question 4

A 2.00 M solution of hydrochloric acid (HCl) is prepared by dissolving 36.5 g of HCl in enough water to make 1.00 L of solution. What is the molarity of the solution?

A. 1.00 M

Correct B. 2.00 M

C. 3.00 M

D. 4.00 M

Correct Answer: B

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Question 5

The diagram below shows a simple black and white chemistry apparatus showing a titration setup. What is the purpose of the pipette?

Correct A. To measure the volume of the acid

B. To measure the volume of the base

C. To mix the acid and base

D. To measure the pH of the solution

Correct Answer: A

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Question 6

A mixture of 2.50 g of NaCl and 1.50 g of KCl is dissolved in 100 mL of water. Calculate the molarity of the solution.

A. 0.05 M

Correct B. 0.10 M

C. 0.15 M

D. 0.20 M

Correct Answer: B

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Question 7

The reaction between H2SO4 and NaOH is represented by the equation: H2SO4 + 2NaOH → Na2SO4 + 2H2O. If 25 mL of 0.5 M H2SO4 is added to 50 mL of 0.2 M NaOH, what is the limiting reac\tant?

Correct A. H2SO4

B. NaOH

C. Neither

D. Both

Correct Answer: A

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Question 8

A 2.0 g sample of a hydrocarbon is burned in a bomb calorimeter, and the heat of combustion is found to be - 36.5 kJ/g. What is the molar heat of combustion of the hydrocarbon?

Correct A. - 1365 kJ/mol

B. - 1368 kJ/mol

C. - 1371 kJ/mol

D. - 1374 kJ/mol

Correct Answer: A

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Question 9

A solution containing 0.50 g of NaCl is prepared by dissolving the salt in 100 mL of water. What is the concentration of the solution in g/L?

Correct A. 5.0 g/L

B. 5.5 g/L

C. 6.0 g/L

D. 6.5 g/L

Correct Answer: A

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Question 10

A 2.0 L sample of a gas at 25°C and 1.0 atm is collected over water at 25°C. What is the partial pressure of the gas?

A. 0.90 atm

B. 0.95 atm

Correct C. 1.0 atm

D. 1.05 atm

Correct Answer: C

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Question 11

A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of Na+ ions in the solution?

A. 0.1 M

Correct B. 0.05 M

C. 0.01 M

D. 0.005 M

Correct Answer: B

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Question 12

A sample of 1.0 g of a polymer is dissolved in 100 mL of a solvent. The solution has a vis\cosity of 2.5 cP. What is the molecular weight of the polymer?

A. 1000 g/mol

B. 5000 g/mol

Correct C. 10000 g/mol

D. 20000 g/mol

Correct Answer: C

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Question 13

A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1000 mL of water. What is the pH of the solution?

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 14

A sample of 1.0 g of a subs\tance is found to have a mass of 1.1 g after being placed in a vacuum chamber. What is the molecular weight of the subs\tance?

A. 10 g/mol

B. 20 g/mol

Correct C. 30 g/mol

D. 40 g/mol

Correct Answer: C

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Question 15

A 1.0 M solution of NaOH is prepared by dissolving 40 g of NaOH in 1000 mL of water. What is the concentration of OH- ions in the solution?

Correct A. 1.0 M

B. 0.5 M

C. 0.1 M

D. 0.05 M

Correct Answer: A

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Question 16

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 298 K, what is the value of the pre-exponential factor (A) if the rate cons\tant (k) is 0.05 s^\( -1 \)?

Correct A. 1.33 x 10^11 s^\( -1 \)

B. 1.33 x 10^10 s^\( -1 \)

C. 1.33 x 10^9 s^\( -1 \)

D. 1.33 x 10^8 s^\( -1 \)

Correct Answer: A

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Question 17

A solution containing 0.1 M NaCl is prepared by dissolving 0.1 g of NaCl in 100 mL of water. What is the concentration of the solution in mol/L?

Correct A. 0.1 M

B. 0.01 M

C. 0.001 M

D. 0.0001 M

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 of the subs\tance will remain after 10 years?

Correct A. 12.5 g

B. 25 g

C. 50 g

D. 100 g

Correct Answer: A

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Question 19

A 0.1 M solution of HCl is prepared by dissolving 0.1 g of HCl in 100 mL of water. What is the pH of the solution?

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 20

A 0.1 M solution of NaOH is prepared by dissolving 0.1 g of NaOH in 100 mL of water. What is the pOH of the solution?

Correct A. 1

B. 2

C. 3

D. 4

Correct Answer: A

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Question 21

The reaction of nitrogen dioxide with water is represented by the equation: 3NO2 + H2O → 2HNO3 + NO. If 2.5 g of NO2 is reacted with excess water, calculate the number of moles of HNO3 produced.

A. 0.25 mol

Correct B. 0.5 mol

C. 0.75 mol

D. 1.0 mol

Correct Answer: B

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Question 22

A solution of 2.0 M HCl is mixed with a solution of 1.0 M NaOH. If 50.0 mL of HCl is used, what is the concentration of the resulting solution?

A. 0.5 M

Correct B. 1.0 M

C. 1.5 M

D. 2.0 M

Correct Answer: B

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Question 23

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(l) from the following reaction: H2(g) + 1/2 O2(g) → H2O(l).

Correct A. -285.8 kJ/mol

B. -393.5 kJ/mol

C. -483.2 kJ/mol

D. -572.9 kJ/mol

Correct Answer: A

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Question 24

A sample of 1.0 g of a non-metallic element has a density of 2.5 g/cm^3. If the element is a member of group 16, what is its atomic number?

A. 16

Correct B. 32

C. 48

D. 64

Correct Answer: B

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Question 25

A solution of 0.1 M HCl is mixed with a solution of 0.2 M NaOH. If 20.0 mL of HCl is used, what is the concentration of the resulting 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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