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POST UTME FUTO 2020 Chemistry | Objective

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Question 1

A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 100 mL of water. Calculate the molar concentration of the solution. \( R = 0.0821 L atm K-1 mol-1, T = 298 K \).

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 2

The s\tandard Gibbs free energy change (ΔG°) for the reaction: 2NO(g) + O2(g) → 2NO2(g) is -111.3 kJ mol-1. Calculate the equilibrium cons\tant (K) for the reaction at 298 K.

A. 1.0 × 10^5

B. 1.0 × 10^6

Correct C. 1.0 × 10^7

D. 1.0 × 10^8

Correct Answer: C

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Question 3

A 10.0 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. 10.0 mL

Correct B. 20.0 mL

C. 30.0 mL

D. 40.0 mL

Correct Answer: B

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Question 4

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 5

A 2.50 g sample of a non-metallic solid is heated in a crucible until it reaches a temperature of 1273 K. Calculate the energy required to heat the sample from 298 K to 1273 K.

A. 100 J

B. 200 J

Correct C. 300 J

D. 400 J

Correct Answer: C

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Question 6

Determine the number of moles of iron(III) oxide (Fe2O3) produced when 2.5 moles of iron(II) sulfate (FeSO4) react with 1.5 moles of sodium hydroxide (NaOH) in the following reaction: 2FeSO4 + 3NaOH + Fe2O3 → Fe2O3 + 2Na2SO4 + 3H2O.

A. 1.5 moles

Correct B. 2.0 moles

C. 2.5 moles

D. 3.0 moles

Correct Answer: B

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Question 7

A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. If the gas is heated to 127°C at cons\tant volume, what is the final pressure in atmospheres?

A. 1.5 atm

B. 2.0 atm

Correct C. 2.5 atm

D. 3.0 atm

Correct Answer: C

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Question 8

The diagram below shows a titration setup.

A. The burette contains the acid.

B. The beaker contains the acid.

C. The burette contains the base.

Correct D. The beaker contains the base.

Correct Answer: D

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Question 9

A solution contains 0.2 mol of HCl and 0.3 mol of NaOH. What is the resulting pH after the reaction?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 10

The diagram below shows a simple black and white chemistry apparatus showing titration setup.

A. The burette contains the acid.

B. The beaker contains the acid.

C. The burette contains the base.

Correct D. The beaker contains the base.

Correct Answer: D

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Question 11

A polymer is a large molecule composed of many repeated subunits called monomers. Which of the following is a characteristic of a polymer?

A. It has a high melting point

B. It has a low boiling point

C. It is soluble in water

Correct D. It has a high molecular weight

Correct Answer: D

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Question 12

The atomic radius of an element is the dis\tance from the nucleus to the outermost electron. Which of the following is a factor that affects the atomic radius?

A. The number of protons in the nucleus

Correct B. The number of electrons in the outermost energy level

C. The number of neutrons in the nucleus

D. The number of electrons in the inner energy levels

Correct Answer: B

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Question 13

A chemical reaction is said to be at equilibrium when the rates of the forward and reverse reactions are equal. Which of the following is a characteristic of a system at equilibrium?

Correct A. The concentrations of the reac\tants and products are equal

B. The rates of the forward and reverse reactions are not equal

C. The system is not in a state of dynamic equilibrium

D. The reaction is spon\taneous

Correct Answer: A

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Question 14

A colloid is a mixture in which the particles are larger than those in a solution but smaller than those in a suspension. Which of the following is a characteristic of a colloid?

A. It has a uniform composition

B. It has a high vis\cosity

Correct C. It is not filterable

D. It has a low surface tension

Correct Answer: C

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Question 15

The mole concept is a fundamental principle in chemistry that relates the amount of a subs\tance to its mass. Which of the following is a unit of measurement used to express the amount of a subs\tance in the mole concept?

A. Gram

B. Ki\logram

Correct C. Mole

D. Liter

Correct Answer: C

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Question 16

Determine the number of moles of nitrogen gas (N2) produced when 2.5 moles of ammonia (NH3) react with 2.5 moles of oxygen gas (O2) according to the following equation: 4NH3 + 5O2 → 4N2 + 6H2O.

A. 1.25

B. 2.5

Correct C. 3.75

D. 5.0

Correct Answer: C

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Question 17

A sample of hydrogen gas (H2) is collected over water at a temperature of 25°C and a pressure of 1.00 atm. If the vapor pressure of water at 25°C is 0.0313 atm, what is the partial pressure of hydrogen gas?

Correct A. 0.9687

B. 0.9697

C. 0.9707

D. 0.9717

Correct Answer: A

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Question 18

A 2.50-g sample of sodium chloride (NaCl) is dissolved in 100.0 mL of water. If the density of the solution is 1.05 g/mL, what is the molarity of the solution?

A. 0.100

Correct B. 0.200

C. 0.300

D. 0.400

Correct Answer: B

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Question 19

A 50.0-mL sample of sulfuric acid (H2SO4) is mixed with 50.0 mL of sodium hydroxide (NaOH). If the resulting solution has a pH of 1.00, what is the concentration of the acid?

A. 0.100

Correct B. 0.200

C. 0.300

D. 0.400

Correct Answer: B

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Question 20

A 10.0-g sample of copper (Cu) is heated in air to produce copper(II) oxide (CuO). If the mass of the oxide produced is 15.0 g, what is the percentage yield of the reaction?

A. 80.0%

B. 85.0%

Correct C. 90.0%

D. 95.0%

Correct Answer: C

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Question 21

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

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 22

A 25.0 mL sample of 0.100 M NaOH is titrated with 0.0500 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.

A. 0.00250 mol

Correct B. 0.00500 mol

C. 0.00750 mol

D. 0.0100 mol

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 C(s) + O2(g) → CO2(g).

Correct A. -393.5 kJ/mol

B. -393.5 kJ/mol + 0.5 kJ/mol

C. -393.5 kJ/mol - 0.5 kJ/mol

D. -393.5 kJ/mol + 1.0 kJ/mol

Correct Answer: A

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Question 24

A 2.00 M solution of H2SO4 is 50.0% ionized. Calculate the concentration of H+ ions in the solution.

A. 0.100 M

Correct B. 0.200 M

C. 0.300 M

D. 0.400 M

Correct Answer: B

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Question 25

A 1.00 L sample of 0.100 M HCl is titrated with 0.0500 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.

A. 0.00250 mol

Correct B. 0.00500 mol

C. 0.00750 mol

D. 0.0100 mol

Correct Answer: B

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