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POST UTME FUTO 2025 Chemistry | Objective

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Question 1

A 2.50 g sample of a compound containing only carbon and hydrogen is combusted in a bomb calorimeter. The heat of combustion is found to be - 2870 kJ. Calculate the empirical formula of the compound.

Correct A. C2H4

B. C3H6

C. C4H8

D. C5H10

Correct Answer: A

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Question 2

A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, calculate the number of moles of HCl present in the solution.

Correct A. 0.00500 mol

B. 0.0100 mol

C. 0.0150 mol

D. 0.0200 mol

Correct Answer: A

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Question 3

A 1.00 L sample of a gas at 27°C and 1.00 atm is compressed to 2.00 L at cons\tant temperature. Calculate the work done on the gas.

A. 2.00 J

Correct B. 4.00 J

C. 6.00 J

D. 8.00 J

Correct Answer: B

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Question 4

A diagram of a periodic table is shown below. Identify the element with atomic number 20.

Correct A. Ca

B. Mg

C. Al

D. Si

Correct Answer: A

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Question 5

A 2.50 g sample of a compound containing only carbon and hydrogen is combusted in a bomb calorimeter. The heat of combustion is found to be - 2870 kJ. Calculate the empirical formula of the compound.

Correct A. C2H4

B. C3H6

C. C4H8

D. C5H10

Correct Answer: A

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Question 6

A reaction is carried out at cons\tant pressure and temperature. The reaction quotient (Q) is 0.5. If the equilibrium cons\tant (K) is 2.5, what is the value of the reaction quotient (Q) after 2.5 moles of product have been added?

A. 0.2

B. 0.5

Correct C. 1.0

D. 2.0

Correct Answer: C

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Question 7

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

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 8

A sample of 1.0 g of glu\cose (C6H12O6) is burned in a bomb calorimeter. The heat of combustion is 2812 kJ/mol. What is the heat of combustion of the glu\cose sample?

Correct A. 2812

B. 2812.5

C. 2813

D. 2813.5

Correct Answer: A

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Question 9

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

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 10

A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the pH of the resulting solution?

A. 7

Correct B. 8

C. 9

D. 10

Correct Answer: B

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Question 11

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 12

A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 10 mL

Correct B. 20 mL

C. 25 mL

D. 30 mL

Correct Answer: B

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Question 13

A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the pH of the solution.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 14

A 10 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. Calculate the pH of the solution at the equivalence point.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 15

A solution contains 0.1 M HCl and 0.1 M NaOH. Calculate the concentration of HCl after the addition of 10 mL of 0.5 M NaOH.

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 16

Calculate the s\tandard enthalpy change (ΔH) for the reaction: 2NO(g) + O2(g) → 2NO2(g). Given that ΔH°(NO2) = 33.2 kJ/mol and ΔH°(NO) = 90.25 kJ/mol.

Correct A. -34.0 kJ/mol

B. -33.2 kJ/mol

C. -90.25 kJ/mol

D. 34.0 kJ/mol

Correct Answer: A

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Question 17

A 2.5 M solution of sulfuric acid (H2SO4) is titrated with 1.0 M sodium hydroxide (NaOH). If 25 mL of NaOH is required to reach the equivalence point, what is the concentration of the H2SO4 solution?

A. 0.5 M

Correct B. 1.0 M

C. 2.0 M

D. 2.5 M

Correct Answer: B

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Question 18

The s\tandard electrode potential for the reaction: Zn(s) + 2Ag+(aq) → Zn2+(aq) + 2Ag(s) is +0.76 V. What is the s\tandard electrode potential for the reaction: Zn2+(aq) + 2e- → Zn(s)?

A. -0.76 V

B. -1.52 V

Correct C. 0.76 V

D. 1.52 V

Correct Answer: C

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Question 19

A 1.0 M solution of sodium chloride (NaCl) is electrolyzed u\sing a platinum electrode. If 2.5 C of electricity is passed through the solution, what is the mass of chlorine gas (Cl2) produced?

A. 0.25 g

Correct B. 0.50 g

C. 1.0 g

D. 2.0 g

Correct Answer: B

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Question 20

A 2.0 M solution of hydrogen peroxide (H2O2) is decomposed by the addition of a catalyst. If 25 mL of the solution is decomposed, what is the concentration of the remaining solution?

A. 1.0 M

B. 1.5 M

Correct C. 2.0 M

D. 2.5 M

Correct Answer: C

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Question 21

A 1.0 M solution of sodium hydroxide (NaOH) is titrated with 1.0 M hydrochloric acid (HCl). If 25 mL of HCl is required to reach the equivalence point, what is the concentration of the NaOH 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 22

A 2.0 M solution of sulfuric acid (H2SO4) is titrated with 1.0 M sodium hydroxide (NaOH). If 25 mL of NaOH is required to reach the equivalence point, what is the concentration of the H2SO4 solution?

A. 1.0 M

B. 1.5 M

Correct C. 2.0 M

D. 2.5 M

Correct Answer: C

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Question 23

A 1.0 M solution of sodium chloride (NaCl) is electrolyzed u\sing a platinum electrode. If 2.5 C of electricity is passed through the solution, what is the mass of chlorine gas (Cl2) produced?

A. 0.25 g

Correct B. 0.50 g

C. 1.0 g

D. 2.0 g

Correct Answer: B

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Question 24

A 2.0 M solution of hydrogen peroxide (H2O2) is decomposed by the addition of a catalyst. If 25 mL of the solution is decomposed, what is the concentration of the remaining solution?

A. 1.0 M

B. 1.5 M

C. 2.0 M

D. 2.5 M

Correct Answer: VIEW ANSWER

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Question 25

Determine the number of moles of oxygen gas (O2) produced when 2.50 g of potassium chlorate (KClO3) decomposes according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g). The molar mass of KClO3 is 122.55 g/mol.

Correct A. 0.0204 mol

B. 0.0408 mol

C. 0.0612 mol

D. 0.0816 mol

Correct Answer: A

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