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POST UTME FUTA 2023 Chemistry | Objective

Are you preparing for POST UTME FUTA exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

In the electrolysis of molten sodium chloride, what is the primary product at the cathode?

Correct A. Sodium metal

B. Chlorine gas

C. Hydrogen gas

D. Sodium chloride

Correct Answer: A

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Question 2

What is the oxidation state of the central atom in the compound [Cr(H2O)6]Cl3?

A. +3

B. +2

Correct C. +6

D. +1

Correct Answer: C

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Question 3

A metal X has a density of 10.5 g/cm3 and a molar mass of 120 g/mol. What is the volume of 2.5 g of X?

A. 1.2 cm3

Correct B. 2.5 cm3

C. 5.0 cm3

D. 10.0 cm3

Correct Answer: B

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Question 4

The reaction 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s) is an example of a ______ reaction.

A. synthesis

B. decomposition

Correct C. \single displacement

D. double displacement

Correct Answer: C

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Question 5

The half-life of a radioactive subs\tance is 5 years. If 100 g of the subs\tance decays to 50 g in 10 years, what is the decay cons\tant?

A. 0.05 yr-1

Correct B. 0.10 yr-1

C. 0.15 yr-1

D. 0.20 yr-1

Correct Answer: B

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Question 6

Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 g of potassium chlorate (KClO3) is decomposed according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).

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 7

A 25.0 mL sample of 0.100 M HCl is mixed with a 25.0 mL sample of 0.100 M NaOH. Calculate 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 8

A solution contains 5.0 g of NaCl per 100.0 mL of solution. What is the molarity of the solution?

A. 0.1 M

B. 0.5 M

Correct C. 1.0 M

D. 5.0 M

Correct Answer: C

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Question 9

A 10.0 mL sample of 0.100 M H2SO4 is mixed with a 10.0 mL sample of 0.100 M Ba(OH)2. Calculate the number of moles of BaSO4 formed.

A. 0.01 mol

Correct B. 0.02 mol

C. 0.03 mol

D. 0.04 mol

Correct Answer: B

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Question 10

A 50.0 mL sample of 0.100 M NaOH is mixed with a 50.0 mL sample of 0.100 M HCl. Calculate 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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Question 11

Calculate the s\tandard enthalpy change (ΔH°) for the reaction: 2NO(g) + O2(g) → 2NO2(g). Given that the s\tandard enthalpy of formation (ΔHf°) for NO(g) is -90.25 kJ/mol, for O2(g) is 0 kJ/mol, and for NO2(g) is -51.3 kJ/mol.

Correct A. -179.4 kJ/mol

B. 179.4 kJ/mol

C. -90.25 kJ/mol

D. 90.25 kJ/mol

Correct Answer: A

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Question 12

A 0.5 M solution of a weak acid (HA) has a pH of 4.5. Calculate the concentration of the acid (HA) and its conjugate base \( A- \).

A. 0.1 M, 0.1 M

B. 0.01 M, 0.01 M

Correct C. 0.1 M, 0.01 M

D. 0.01 M, 0.1 M

Correct Answer: C

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Question 13

A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. Calculate the molar mass of the repeating unit.

A. 200 g/mol

Correct B. 500 g/mol

C. 1000 g/mol

D. 2000 g/mol

Correct Answer: B

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Question 14

A solution of NaCl is prepared by dissolving 35.5 g of NaCl in 250 mL of water. Calculate the molarity of the solution.

A. 0.1 M

Correct B. 0.5 M

C. 1 M

D. 2 M

Correct Answer: B

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Question 15

A 1 M solution of H2SO4 is mixed with a 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 16

At 25°C, the vapor pressure of a solution containing 10.0 g of urea in 50.0 g of water is 75.0 mmHg. If the vapor pressure of pure water at 25°C is 23.8 mmHg, calculate the mole \fraction of urea in the solution.

Correct A. 0.025

B. 0.050

C. 0.100

D. 0.200

Correct Answer: A

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Question 17

Identify the type of reaction that occurs when a solution of sodium hydroxide is added to a solution of hydrochloric acid.

Correct A. Neutralization reaction

B. Oxidation-reduction reaction

C. Precipitation reaction

D. Combustion reaction

Correct Answer: A

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Question 18

A 2.50 L flask contains 0.500 mol of an ideal gas at a temperature of 298 K. Calculate the pressure of the gas u\sing the ideal gas law.

A. 1.01 x 10^2 Pa

Correct B. 2.02 x 10^2 Pa

C. 3.03 x 10^2 Pa

D. 4.04 x 10^2 Pa

Correct Answer: B

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Question 19

A 25.0 mL sample of a solution containing 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 12.5 mL

Correct B. 25.0 mL

C. 37.5 mL

D. 50.0 mL

Correct Answer: B

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Question 20

A diagram of a titration setup is shown below. Identify the type of titration being performed.

Correct A. Acid-base titration

B. Redox titration

C. Complexation titration

D. Precipitation titration

Correct Answer: A

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Question 21

The atomic radius of an element in a period increases as you move from left to right, but decreases as you move down a group. Explain this periodic tr\end.

A. Due to the increase in nuclear charge, the electrons are pulled closer to the nucleus.

Correct B. As you move down a group, the number of energy levels increases, resulting in a larger atomic radius.

C. The atomic radius increases as you move down a group due to the increase in the number of energy levels.

D. The atomic radius decreases as you move down a group due to the increase in nuclear charge.

Correct Answer: B

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Question 22

A solution contains 2.5 g of NaCl in 100 mL of water. Calculate the molarity of the solution.

Correct A. 0.00025 M

B. 0.0025 M

C. 0.025 M

D. 0.25 M

Correct Answer: A

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Question 23

The diagram below shows a titration setup. Identify the part labeled 'A'.

Correct A. Burette

B. Conical flask

C. Pipette

D. Thermometer

Correct Answer: A

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Question 24

A hydrocarbon has the molecular formula C4H10. What is its IUPAC name?

A. Bu\tane

B. Isobu\tane

Correct C. n-Bu\tane

D. 2-Methylpropane

Correct Answer: C

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Question 25

A metal oxide has the formula M2O3. What is the oxidation state of the metal?

Correct A. +3

B. +5

C. +7

D. +9

Correct Answer: A

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