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POST UTME NOUN 2019 Chemistry | Objective

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Question 1

Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 2

A diagram of a titration setup is shown below. If 25.0 mL of 0.1 M HCl is added to 25.0 mL of 0.1 M NaOH, what is the pH of the resulting solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 3

The rate cons\tant (k) for a first-order reaction is given by the equation: k = 2.303/t \log[A]0/[A]t. If the initial concentration of the reac\tant is 0.1 M and the concentration at time t is 0.01 M, what is the value of k?

A. 0.1

B. 0.5

Correct C. 1.0

D. 2.0

Correct Answer: C

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Question 4

A diagram of a metal extraction process is shown below. Identify the type of metal being extracted.

A. Aluminum

Correct B. Copper

C. Iron

D. Zinc

Correct Answer: B

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Question 5

The half-life of a radioactive subs\tance is 10 years. If the initial activity is 1000 Bq, what is the activity after 20 years?

Correct A. 500 Bq

B. 1000 Bq

C. 2000 Bq

D. 5000 Bq

Correct Answer: A

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Question 6

The reaction between chlorine gas and potassium iodide is a classic example of a redox reaction. What is the oxidation state of iodine in KI?

A. 0

B. -1

Correct C. +1

D. +2

Correct Answer: C

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Question 7

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

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 measure the pH of the solution

Correct Answer: A

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Question 8

The reaction between sodium hydroxide and hydrochloric acid is a classic example of a neutralization reaction. What is the products of this reaction?

Correct A. NaCl and H2O

B. NaOH and HCl

C. Na2O and H2

D. NaH and Cl2

Correct Answer: A

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Question 9

The diagram below shows a molecular structure. What is the shape of this molecule?

A. Linear

B. Trigonal Planar

C. Tetrahedral

Correct D. Bent

Correct Answer: D

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Question 10

The reaction between potassium permanganate and oxalic acid is a classic example of an oxidation-reduction reaction. What is the products of this reaction?

A. KMnO4 and H2C2O4

Correct B. K2C2O4 and MnO2

C. K2C2O4 and MnSO4

D. KMnO4 and MnSO4

Correct Answer: B

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Question 11

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

A. -110.5 kJ/mol

B. -110.5 kJ/mol

C. -110.5 kJ/mol

Correct D. -110.5 kJ/mol

Correct Answer: D

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Question 12

A 2.5 L flask contains 0.25 mol of a gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.

A. 1.01 × 10^5 Pa

B. 1.01 × 10^5 Pa

C. 1.01 × 10^5 Pa

Correct D. 1.01 × 10^5 Pa

Correct Answer: D

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Question 13

A solution contains 0.1 M NaCl. Calculate the concentration of Cl- ions in the solution.

A. 0.1 M

B. 0.1 M

C. 0.1 M

Correct D. 0.1 M

Correct Answer: D

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Question 14

A 1.0 L flask contains 0.5 mol of a gas at 50°C. Calculate the pressure of the gas u\sing the ideal gas law.

A. 2.01 × 10^5 Pa

B. 2.01 × 10^5 Pa

C. 2.01 × 10^5 Pa

Correct D. 2.01 × 10^5 Pa

Correct Answer: D

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Question 15

A 2.0 L flask contains 0.25 mol of a gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.

A. 1.01 × 10^5 Pa

B. 1.01 × 10^5 Pa

C. 1.01 × 10^5 Pa

Correct D. 1.01 × 10^5 Pa

Correct Answer: D

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Question 16

A sample of a metal oxide is heated in a crucible to produce a gas. The gas is collected over water and found to have a volume of 2.5 L at 25°C and 1 atm. Calculate the number of moles of the gas produced.

Correct A. 0.25 mol

B. 0.5 mol

C. 0.75 mol

D. 1.0 mol

Correct Answer: A

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Question 17

A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. The resulting solution is then titrated with 0.1 M H2SO4. Calculate the volume of H2SO4 required to reach the equivalence point.

A. 50 mL

Correct B. 100 mL

C. 150 mL

D. 200 mL

Correct Answer: B

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Question 18

A sample of a gas is collected over water at 25°C and 1 atm. The volume of the gas is 2.5 L. Calculate the partial pressure of the gas.

A. 0.5 atm

B. 0.75 atm

Correct C. 1.0 atm

D. 1.25 atm

Correct Answer: C

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Question 19

A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. The resulting solution is then titrated with 0.1 M H2SO4. Calculate the pH of the resulting solution at the equivalence point.

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 20

A sample of a metal oxide is heated in a crucible to produce a gas. The gas is collected over water and found to have a volume of 2.5 L at 25°C and 1 atm. Calculate the molar mass of the gas.

A. 20 g/mol

B. 30 g/mol

Correct C. 40 g/mol

D. 50 g/mol

Correct Answer: C

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Question 21

Determine the major product of the reaction between 2-methylpropene and HCl.

Correct A. 1-chloro-2-methylpropane

B. 2-chloro-2-methylpropane

C. 1-chloro-2-methylbu\tane

D. 2-chloro-2-methylbu\tane

Correct Answer: A

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Question 22

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, what is the concentration of the HCl solution?

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 23

Calculate the s\tandard enthalpy change for the reaction: 2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s). The s\tandard enthalpy of formation for Al2O3(s) is -1675.7 kJ/mol, and the s\tandard enthalpy of formation for Fe2O3(s) is -826.4 kJ/mol.

Correct A. -1431.1 kJ/mol

B. -1431.2 kJ/mol

C. -1431.3 kJ/mol

D. -1431.4 kJ/mol

Correct Answer: A

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Question 24

A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?

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

Determine the major product of the reaction between 2-methylpropene and HCl.

Correct A. 1-chloro-2-methylpropane

B. 2-chloro-2-methylpropane

C. 1-chloro-2-methylbu\tane

D. 2-chloro-2-methylbu\tane

Correct Answer: A

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