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POST UTME DELSU 2022 Chemistry | Objective

Are you preparing for POST UTME DELSU 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

The element with atomic number 12 is classified as a metalloid. Which of the following is a characteristic of metalloids?

A. They are typically brittle and have a high melting point.

B. They are typically malleable and have a low melting point.

C. They are typically conductors of electricity.

Correct D. They are typically semiconductors.

Correct Answer: D

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Question 2

A 2.5 M solution of HCl is prepared by dissolving 12.5 g of HCl in water to make 1 L of solution. What is the molarity of the solution?

Correct A. 2.5 M

B. 2.0 M

C. 1.0 M

D. 0.5 M

Correct Answer: A

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Question 3

A sample of a polymer has a molecular weight of 50,000 g/mol. If 1.0 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?

A. 0.5 g/L

Correct B. 1.0 g/L

C. 2.0 g/L

D. 5.0 g/L

Correct Answer: B

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Question 4

A solution of NaOH is prepared by dissolving 10 g of NaOH in 100 mL of water. What is the concentration of the solution in M?

A. 0.1 M

B. 0.5 M

Correct C. 1.0 M

D. 2.0 M

Correct Answer: C

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Question 5

A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in water to make 1 L of solution. What is the pH of the solution?

Correct A. 0

B. 1

C. 2

D. 3

Correct Answer: A

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Question 6

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 7

Calculate the equilibrium cons\tant (Kc) for the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g), given that at equilibrium, [N2] = 0.2 M, [H2] = 0.6 M, and [NH3] = 0.8 M.

A. 0.25

Correct B. 0.50

C. 1.00

D. 2.00

Correct Answer: B

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Question 8

A 25.0 mL sample of a colloidal solution containing 1.00 g of Fe(OH)3 is titrated with 0.100 M HCl. Calculate the number of moles of HCl required to precipitate the Fe(OH)3.

A. 0.00500 mol

Correct B. 0.0100 mol

C. 0.0150 mol

D. 0.0200 mol

Correct Answer: B

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Question 9

A sample of nitrogen gas occupies a volume of 2.50 L at a pressure of 1.00 atm and a temperature of 298 K. Calculate the number of moles of nitrogen gas present.

A. 0.0100 mol

Correct B. 0.0200 mol

C. 0.0300 mol

D. 0.0400 mol

Correct Answer: B

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Question 10

A 25.0 mL sample of a solution containing 1.00 g of KNO3 is titrated with 0.100 M HCl. Calculate the number of moles of HCl required to precipitate the KNO3.

A. 0.00500 mol

Correct B. 0.0100 mol

C. 0.0150 mol

D. 0.0200 mol

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 combustion of 2.5 g of carbon at 298 K.

Correct A. -981.25 kJ

B. -393.5 kJ

C. -1968.75 kJ

D. -981.25 kJ/mol

Correct Answer: A

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Question 12

A 0.1 M solution of NaCl is prepared by dissolving 6.0 g of NaCl in 1000 mL of water. Calculate the molarity of the solution after 10 mL of 1.0 M HCl has been added.

A. 0.1 M

Correct B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: B

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Question 13

A sample of a gas has a volume of 2.5 L at a pressure of 1.5 atm. What is the pressure of the gas when its volume is increased to 5.0 L at 298 K?

A. 0.75 atm

Correct B. 1.0 atm

C. 1.5 atm

D. 2.0 atm

Correct Answer: B

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Question 14

A 2.0 M solution of HCl is prepared by dissolving 40.0 g of HCl in 1000 mL of water. Calculate the molarity of the solution after 10 mL of 1.0 M NaOH has been added.

A. 1.5 M

Correct B. 1.0 M

C. 0.5 M

D. 0.2 M

Correct Answer: B

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Question 15

A 0.1 M solution of NaOH is prepared by dissolving 6.0 g of NaOH in 1000 mL of water. Calculate the molarity of the solution after 10 mL of 1.0 M HCl has been added.

A. 0.1 M

Correct B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: B

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Question 16

The reaction of nitrogen dioxide with water is represented by the equation: 3NO2 + H2O → 2HNO3 + NO. What is the oxidation state of nitrogen in the product NO?

A. +1

Correct B. +2

C. +3

D. +4

Correct Answer: B

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Question 17

The diagram below represents 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 filter the solution

Correct Answer: A

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Question 18

The reaction of sulfur dioxide with oxygen is represented by the equation: 2SO2 + O2 → 2SO3. What is the oxidation state of sulfur in the product SO3?

A. +2

B. +4

Correct C. +6

D. +8

Correct Answer: C

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Question 19

The diagram below represents a chemical apparatus setup. What is the purpose of the condenser?

Correct A. To cool the gas

B. To heat the gas

C. To mix the gas and liquid

D. To filter the gas

Correct Answer: A

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Question 20

The reaction of chlorine with water is represented by the equation: Cl2 + H2O → HCl + HOCl. What is the oxidation state of chlorine in the product HCl?

A. +1

Correct B. -1

C. +2

D. -2

Correct Answer: B

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Question 21

The van der Waals equation is given by \( left\( P + \frac{a}{V^2} \right \ \) \( V - b \) = RT ). If the gas cons\tant R = 0.08206 L atm K^{-1} mol^{-1}, the van der Waals cons\tant 'a' for a gas is 3.61 L^2 atm mol^{-2}. Calculate the value of the van der Waals cons\tant 'b' for the gas, given that the pressure P = 1 atm, the temperature T = 300 K, and the volume V = 22.4 L.

A. 0.0427 L mol^{-1}

Correct B. 0.0437 L mol^{-1}

C. 0.0447 L mol^{-1}

D. 0.0457 L mol^{-1}

Correct Answer: B

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Question 22

A 0.5 M solution of NaOH is prepared by dissolving 25 g of NaOH in 1 L of water. Calculate the number of moles of NaOH dissolved in the solution.

Correct A. 0.25 mol

B. 0.5 mol

C. 0.75 mol

D. 1 mol

Correct Answer: A

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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 kJ/mol

C. -393.5 kJ/mol - 0 kJ/mol

D. -393.5 kJ/mol + 0 kJ/mol - 0 kJ/mol

Correct Answer: A

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Question 24

A 2.5 M solution of HCl is prepared by dissolving 50 g of HCl in 1 L of water. Calculate the number of moles of HCl dissolved in the solution.

Correct A. 1.25 mol

B. 2.5 mol

C. 3.75 mol

D. 5 mol

Correct Answer: A

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Question 25

The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of formation of H2(g) + 1/2 O2(g) → H2O(l).

Correct A. -285.8 kJ/mol

B. -285.8 kJ/mol + 0 kJ/mol

C. -285.8 kJ/mol - 0 kJ/mol

D. -285.8 kJ/mol + 0 kJ/mol - 0 kJ/mol

Correct Answer: A

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