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POST UTME UI 2017 Chemistry | Objective

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Question 1

A 2.00 g sample of a subs\tance is placed in a 100.0 mL flask and heated to 100°C. If the pressure of the gas is 1.00 atm, what is the number of moles of the gas present?

A. 0.0500 mol

B. 0.100 mol

Correct C. 0.200 mol

D. 0.500 mol

Correct Answer: C

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Question 2

A solution of 0.100 M HCl is titrated with 0.100 M NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the number of moles of HCl present?

A. 0.00250 mol

Correct B. 0.00500 mol

C. 0.00750 mol

D. 0.0125 mol

Correct Answer: B

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Question 3

A 1.00 L flask contains 0.100 mol of a gas at 25°C. If the pressure of the gas is 1.00 atm, what is the temperature of the gas in Kelvin?

A. 298 K

Correct B. 298.15 K

C. 300 K

D. 300.15 K

Correct Answer: B

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Question 4

A 2.00 g sample of a subs\tance is placed in a 100.0 mL flask and heated to 100°C. If the pressure of the gas is 1.00 atm, what is the volume of the flask in liters?

A. 0.100 L

B. 0.200 L

Correct C. 0.500 L

D. 1.00 L

Correct Answer: C

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Question 5

A solution of 0.100 M HCl is titrated with 0.100 M NaOH. If 25.0 mL of NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?

A. 0.100 M

Correct B. 0.200 M

C. 0.500 M

D. 1.00 M

Correct Answer: B

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Question 6

The pH of a 0.1 M solution of a weak acid HA is 4.5. If 10 mL of 1 M NaOH is added to 90 mL of the acid solution, what is the pH of the resulting solution?

A. 3.5

B. 4.5

Correct C. 5.5

D. 6.5

Correct Answer: C

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Question 7

A polymer has the following structure: [-CH2-CH2-O-]n. What is the type of polymerization reaction that occurred to form this polymer?

A. Condensation polymerization

Correct B. Addition polymerization

C. Ring-opening polymerization

D. Step-growth polymerization

Correct Answer: B

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Question 8

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

A. 25 mL

Correct B. 50 mL

C. 75 mL

D. 100 mL

Correct Answer: B

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Question 9

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

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 10

A 1.0 M solution of NaOH is titrated with a 1.0 M solution of HCl. If 20 mL of HCl is added to 80 mL of NaOH, what is the pH of the resulting solution?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 11

In the electrolysis of a solution of copper(II) sulfate, the anode is made of platinum and the cathode is made of copper. What is the primary function of the anode in this electrolysis?

A. To reduce copper(II) ions to copper metal

Correct B. To oxidize copper metal to copper(II) ions

C. To facilitate the flow of electrons from the anode to the cathode

D. To prevent the deposition of copper metal on the anode

Correct Answer: B

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Question 12

A polymer is made up of repeating units of the following structure: CH2=CH-CH2-CH2-CH2-CH2. What is the name of this polymer?

Correct A. Polyethylene

B. Polypropylene

C. Polyvinyl chloride

D. Polystyrene

Correct Answer: A

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Question 13

A solution of sodium hydroxide is added to a solution of hydrochloric acid. What is the resulting solution?

Correct A. A solution of sodium chloride and water

B. A solution of sodium hydroxide and water

C. A solution of hydrochloric acid and water

D. A solution of sodium carbonate and water

Correct Answer: A

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Question 14

A diagram of a redox reaction is shown below. What is the oxidation state of the oxygen atom in the compound?

A. -2

B. 0

Correct C. +2

D. +4

Correct Answer: C

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Question 15

A diagram of a titration setup is shown below. What is the purpose of the burette in this setup?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To separate the titrant and analyte

Correct Answer: A

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Question 16

The reaction of nitrogen dioxide with water to form nitric acid and nitrous acid is an example of a reaction that involves the formation of a(n) _______________________.

A. heterogeneous equilibrium

B. homogeneous equilibrium

C. heterogeneous reaction

Correct D. homogeneous reaction

Correct Answer: D

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Question 17

The rate of reaction between hydrogen peroxide and iodide ions is increased by the presence of a(n) _______________________.

Correct A. catalyst

B. inhibitor

C. substrate

D. product

Correct Answer: A

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Question 18

The solubility of a subs\tance is defined as the _______________________ of the subs\tance in a given solvent at a particular temperature.

A. maximum

B. minimum

Correct C. equilibrium

D. concentration

Correct Answer: C

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Question 19

The reaction of sodium hydroxide with hydrochloric acid to form sodium chloride and water is an example of a(n) _______________________ reaction.

Correct A. neutralization

B. oxidation

C. reduction

D. decomposition

Correct Answer: A

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Question 20

The rate of reaction between hydrogen peroxide and iodide ions is affected by the _______________________ of the reaction.

Correct A. temperature

B. pressure

C. concentration

D. time

Correct Answer: A

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Question 21

In a titration experiment, 25.0 cm³ of 0.100 M NaOH is required to neutralize 20.0 cm³ of a weak acid. Calculate the concentration of the acid.

Correct A. 0.0500 M

B. 0.100 M

C. 0.200 M

D. 0.500 M

Correct Answer: A

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Question 22

The half-life of a radioactive subs\tance is 5.0 days. If 100.0 mg of the subs\tance is initially present, how much will remain after 20.0 days?

A. 20.0 mg

Correct B. 40.0 mg

C. 60.0 mg

D. 80.0 mg

Correct Answer: B

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Question 23

A 2.00 g sample of a non-metallic oxide is treated with excess HCl. If 25.0 cm³ of 0.100 M HCl is required to neutralize the oxide, calculate the percentage composition of the oxide.

A. 40.0%

Correct B. 50.0%

C. 60.0%

D. 70.0%

Correct Answer: B

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Question 24

A 10.0 cm³ sample of a solution containing 0.100 M HCl is titrated with 0.100 M NaOH. If 20.0 cm³ of NaOH is required to reach the equivalence point, what is the concentration of the acid?

A. 0.0500 M

Correct B. 0.100 M

C. 0.200 M

D. 0.500 M

Correct Answer: B

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Question 25

A 5.00 g sample of a metal carbonate is heated to produce a metal oxide and CO₂ gas. If 20.0 cm³ of CO₂ is collected at STP, calculate the molar mass of the metal.

A. 20.0 g/mol

B. 40.0 g/mol

Correct C. 60.0 g/mol

D. 80.0 g/mol

Correct Answer: C

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