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POST UTME OSUSTECH 2022 Chemistry | Objective

Are you preparing for POST UTME OSUSTECH exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

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

Correct A. 2-chloro-2-methylpropane

B. 2-chloro-2-methylbu\tane

C. 2-chloro-3-methylbu\tane

D. 2-chloro-3-methylpen\tane

Correct Answer: A

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Question 2

The reaction of an alkene with ozone is followed by the addition of zinc dust. What is the major product of this reaction?

Correct A. an epoxide

B. an alkane

C. an alkene

D. an alkyne

Correct Answer: A

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Question 3

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

A. to measure the volume of the acid

Correct B. to measure the volume of the base

C. to measure the pH of the solution

D. to measure the temperature of the solution

Correct Answer: B

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Question 4

The reaction of an alkene with bromine is a test for the presence of a double bond. What is the major product of this reaction?

A. an alkane

B. an alkene

C. an alkyne

Correct D. a dibromide

Correct Answer: D

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Question 5

A diagram of a chromatography setup is shown below. What is the purpose of the stationary phase?

Correct A. to separate the components of a mixture

B. to identify the components of a mixture

C. to purify a subs\tance

D. to analyze the properties of a subs\tance

Correct Answer: A

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Question 6

Determine the molar solubility of AgCl in a 0.1 M NaCl solution, given that the solubility product cons\tant (Ksp) for AgCl is 1.8 × 10^-10. Assume that the activity coefficients for Ag+ and Cl- are unity.

Correct A. 1.0 × 10^-4 M

B. 1.0 × 10^-5 M

C. 1.0 × 10^-6 M

D. 1.0 × 10^-7 M

Correct Answer: A

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Question 7

A 25.0 mL sample of 0.100 M HCl is added to a 100.0 mL sample of 0.0100 M NaOH. What is the concentration of the resulting solution?

A. 0.00500 M

B. 0.0100 M

Correct C. 0.0150 M

D. 0.0200 M

Correct Answer: C

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Question 8

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of combustion of 1.00 mol of C(s) to form CO2(g)?

A. -393.5 kJ

B. -393.5 kJ/mol

Correct C. -393.5 kJ/mol × 1.00 mol

D. -393.5 kJ/mol × 1.00 mol × 1.00

Correct Answer: C

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Question 9

A diagram of a titration setup is shown below. What is the concentration of the NaOH solution?

Correct A. 0.100 M

B. 0.0100 M

C. 0.00100 M

D. 0.000100 M

Correct Answer: A

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Question 10

The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. What is the s\tandard enthalpy of vaporization of 1.00 mol of H2O(l) to form H2O(g)?

A. -285.8 kJ

B. -285.8 kJ/mol

Correct C. -285.8 kJ/mol × 1.00 mol

D. -285.8 kJ/mol × 1.00 mol × 1.00

Correct Answer: C

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Question 11

The atomic radius of an element is 100 pm. If the element is in the 4th period of the periodic table, what is the value of the principal quantum number (n) for the element?

A. 3

Correct B. 4

C. 5

D. 6

Correct Answer: B

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Question 12

A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. If the reaction is allowed to proceed until equilibrium is reached, what is the concentration of HCl remaining in the solution?

Correct A. 0.05 M

B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: A

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Question 13

The rate cons\tant (k) for a first-order reaction is 0.05 min^-1. If the initial concentration of the reac\tant is 0.1 M, what is the concentration of the reac\tant after 10 minutes?

Correct A. 0.01 M

B. 0.05 M

C. 0.1 M

D. 0.2 M

Correct Answer: A

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Question 14

A metal M has a s\tandard electrode potential of +0.5 V. If a solution of 0.1 M M^2+ is mixed with a solution of 0.1 M Ag^+, what is the concentration of Ag+ remaining in the solution?

Correct A. 0.05 M

B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: A

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Question 15

A solution of 0.1 M H2SO4 is mixed with a solution of 0.1 M NaOH. If the reaction is allowed to proceed until equilibrium is reached, what is the concentration of H2SO4 remaining in the solution?

Correct A. 0.05 M

B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: A

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Question 16

A metal M has a s\tandard electrode potential of +0.5 V. If a solution of 0.1 M M^2+ is mixed with a solution of 0.1 M Cu^2+, what is the concentration of Cu^2+ remaining in the solution?

Correct A. 0.05 M

B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: A

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Question 17

A solution of 0.1 M HCl is mixed with a solution of 0.1 M NaOH. If the reaction is allowed to proceed until equilibrium is reached, what is the concentration of HCl remaining in the solution?

Correct A. 0.05 M

B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: A

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Question 18

A metal M has a s\tandard electrode potential of +0.5 V. If a solution of 0.1 M M^2+ is mixed with a solution of 0.1 M Ag^+, what is the concentration of Ag+ remaining in the solution?

Correct A. 0.05 M

B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: A

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Question 19

A solution of 0.1 M H2SO4 is mixed with a solution of 0.1 M NaOH. If the reaction is allowed to proceed until equilibrium is reached, what is the concentration of H2SO4 remaining in the solution?

Correct A. 0.05 M

B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: A

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Question 20

The reaction between chlorine gas and potassium iodide is a classic example of a redox reaction. Which of the following is the correct representation of the reaction in terms of half-equations?

Correct A. \\text{Cl}_2 + 2\\text{e}^- \\rightarrow 2\\text{Cl}^-

B. 2\text{KI} \rightarrow \text{I}_2 + 2\text{K}^+

C. \text{Cl}_2 + 2\text{KI} \rightarrow 2\text{KCl} + \text{I}_2

D. 2\\text{Cl}^- \\rightarrow \\text{Cl}_2 + 2\\text{e}^-

Correct Answer: A

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Question 21

A 2.5 M solution of sodium hydroxide is prepared by dissolving 12.5 g of sodium hydroxide in 1 L of water. What is the concentration of the solution in terms of molarity?

Correct A. 2.5 M

B. 5.0 M

C. 10.0 M

D. 12.5 M

Correct Answer: A

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Question 22

A 1.0 M solution of hydrochloric acid is prepared by dissolving 36.5 g of hydrochloric acid in 1 L of water. What is the concentration of the solution in terms of molarity?

Correct A. 1.0 M

B. 2.0 M

C. 3.0 M

D. 4.0 M

Correct Answer: A

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Question 23

A 2.0 M solution of sodium chloride is prepared by dissolving 40.0 g of sodium chloride in 1 L of water. What is the concentration of the solution in terms of molarity?

Correct A. 2.0 M

B. 4.0 M

C. 6.0 M

D. 8.0 M

Correct Answer: A

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Question 24

A 1.5 M solution of potassium nitrate is prepared by dissolving 67.5 g of potassium nitrate in 1 L of water. What is the concentration of the solution in terms of molarity?

Correct A. 1.5 M

B. 3.0 M

C. 4.5 M

D. 6.0 M

Correct Answer: A

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Question 25

A 2.2 M solution of calcium chloride is prepared by dissolving 148.0 g of calcium chloride in 1 L of water. What is the concentration of the solution in terms of molarity?

Correct A. 2.2 M

B. 4.4 M

C. 6.6 M

D. 8.8 M

Correct Answer: A

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