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POST UTME VERITAS UNIVERSITY 2017 Chemistry | Objective

Are you preparing for POST UTME VERITAS UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of hydrogen gas (H2) react with oxygen gas according to the equation: 2H2 + O2 → 2H2O.

Correct A. 1.25 moles

B. 2.5 moles

C. 5 moles

D. 10 moles

Correct Answer: A

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Question 2

A 2.5 M solution of sodium hydroxide (NaOH) is titrated with a 0.5 M solution of hydrochloric acid (HCl). If 25 mL of the acid is required to reach the equivalence point, what is the volume of the base solution that was used?

A. 50 mL

B. 100 mL

Correct C. 125 mL

D. 250 mL

Correct Answer: C

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Question 3

A diagram of a titration apparatus is shown below. If the burette contains 25 mL of 0.5 M HCl and the equivalence point is reached at 50 mL, what is the concentration of the NaOH solution?

A. 0.1 M

B. 0.25 M

Correct C. 0.5 M

D. 1 M

Correct Answer: C

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Question 4

A 2.5 g sample of a polymer is dissolved in 50 mL of solvent. If the solution has a density of 1.2 g/mL, what is the concentration of the polymer solution in g/L?

A. 0.1 g/L

B. 0.5 g/L

Correct C. 1 g/L

D. 5 g/L

Correct Answer: C

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Question 5

A diagram of a polymer chain is shown below. If the chain has a molecular weight of 100,000 g/mol and the density of the polymer is 1.5 g/mL, what is the volume of the polymer chain?

A. 0.1 mL

B. 0.5 mL

Correct C. 1 mL

D. 5 mL

Correct Answer: C

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Question 6

Determine the number of stereocenters in the following compound: CH3CH(OH)CH2CH3

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 7

Calculate the s\tandard enthalpy of formation of CO2(g) from the following equation: C(s) + O2(g) → CO2(g). The s\tandard enthalpy of formation of C(s) is -393.5 kJ/mol, and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.

A. -393.5 kJ/mol

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

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

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

Correct Answer: C

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Question 8

Identify the type of reaction that occurs when a solution of sodium hydroxide (NaOH) is added to a solution of hydrochloric acid (HCl).

Correct A. Neutralization reaction

B. Oxidation-reduction reaction

C. Acid-base reaction

D. Precipitation reaction

Correct Answer: A

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Question 9

A polymer is made up of repeating units of the following structure: CH2=CH-CH2-CH3. 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 10

Calculate the molar mass of the following compound: CH3CH2CH2OH.

A. 30.07 g/mol

B. 32.04 g/mol

Correct C. 34.08 g/mol

D. 36.12 g/mol

Correct Answer: C

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Question 11

Determine the structure of the compound formed by the reaction of 2-methylpropane with chlorine gas, given that the reaction is a free-radical ha\logenation.

A. \( \text{CH}_3 \text{CH}_2 \text{CH}_2 \text{Cl} \)

B. \( \text{CH}_3 \text{CH}_2 \text{CH}_2 \text{CH}_2 \text{Cl} \)

Correct C. \( \text{CH}_3 \text{CH}_2 \text{CH}\( \text{Cl})\text{CH}_3 \ \)

D. \( \text{CH}_3 \text{CH}\( \text{Cl})\text{CH}_2 \text{CH}_3 \ \)

Correct Answer: C

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Question 12

A 0.5 M solution of sodium hydroxide is titrated with a 0.1 M solution of hydrochloric acid. Calculate the pH of the solution after 25 mL of the acid has been added.

A. \( \text{pH} = 7 \)

B. \( \text{pH} = 9 \)

Correct C. \( \text{pH} = 10 \)

D. \( \text{pH} = 11 \)

Correct Answer: C

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Question 13

A sample of air contains 20% oxygen and 80% nitrogen by volume. If the total volume of the air sample is 10 L, what is the volume of oxygen present?

A. \( 2 \text{ L} \)

Correct B. \( 4 \text{ L} \)

C. \( 6 \text{ L} \)

D. \( 8 \text{ L} \)

Correct Answer: B

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Question 14

A 2.5 g sample of a non-volatile solute is dissolved in 25 g of water to form a solution. Calculate the molality of the solution.

A. \( 0.1 \text{ m} \)

B. \( 0.2 \text{ m} \)

Correct C. \( 0.3 \text{ m} \)

D. \( 0.4 \text{ m} \)

Correct Answer: C

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Question 15

A 0.1 M solution of sodium carbonate is titrated with a 0.1 M solution of hydrochloric acid. Calculate the pH of the solution after 50 mL of the acid has been added.

A. \( \text{pH} = 7 \)

B. \( \text{pH} = 9 \)

C. \( \text{pH} = 10 \)

Correct D. \( \text{pH} = 11 \)

Correct Answer: D

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Question 16

A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?

A. 3

B. 4

Correct C. 5

D. 6

Correct Answer: C

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Question 17

The reaction of an alkanol with a strong acid produces a salt and water. If the alkanol has the molecular formula C3H7OH and the acid has the molecular formula HCl, what is the molecular formula of the salt produced?

A. C3H7Cl

B. C3H7OH

Correct C. C3H7OCl

D. C3H7HCl

Correct Answer: C

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Question 18

A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?

A. 200

Correct B. 400

C. 500

D. 600

Correct Answer: B

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Question 19

A non-metal has an atomic number of 16 and an atomic mass of 32 g/mol. What is the symbol of the non-metal?

A. S

Correct B. P

C. Cl

D. Br

Correct Answer: B

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Question 20

A periodic table has the following elements: H, He, Li, Be, B, C, N, O, F, Ne. What is the group number of the element with atomic number 6?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 21

The reaction between nitrogen dioxide (NO2) and ozone (O3) is a key process in the formation of smog. Write the balanced chemical equation for this reaction, including the correct coefficients.

Correct A. 2NO_2 + O_3 \rightarrow 2NO + 2O_2

B. 2NO_2 + O_3 \rightarrow 2NO + O_2

C. NO_2 + O_3 \rightarrow NO + O_2

D. 2NO_2 + O_3 \rightarrow 2NO + 3O_2

Correct Answer: A

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Question 22

A sample of sulfur dioxide (SO2) gas is collected over water at a temperature of 25°C and a pressure of 1 atm. Calculate the volume of the gas at s\tandard temperature and pressure (STP).

A. V = \frac{1 atm \times 2 L \times 273 K}{1 atm \times 298 K}

B. V = \frac{1 atm \times 2 L \times 298 K}{1 atm \times 273 K}

Correct C. V = \frac{1 atm \times 2 L \times 273 K}{1 atm \times 298 K} \times \frac{273 K}{298 K}

D. V = \frac{1 atm \times 2 L \times 298 K}{1 atm \times 273 K} \times \frac{298 K}{273 K}

Correct Answer: C

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Question 23

The graph below shows the relationship between the volume of a gas and its temperature. What is the value of the slope of the line?

A. \frac{\Delta V}{\Delta T} = 2 L/K

Correct B. \frac{\Delta V}{\Delta T} = 1 L/K

C. \frac{\Delta V}{\Delta T} = 0.5 L/K

D. \frac{\Delta V}{\Delta T} = 3 L/K

Correct Answer: B

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Question 24

The periodic table below shows the position of the elements in the periodic table. What is the atomic number of the element in group 17, period 3?

Correct A. 17

B. 18

C. 19

D. 20

Correct Answer: A

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Question 25

A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 25 g of NaOH in water to make 1 L of solution. Calculate the molarity of the solution.

A. M = \frac{25 g}{1 L} \times \frac{1 mol}{40 g}

Correct B. M = \frac{25 g}{1 L} \times \frac{1 mol}{20 g}

C. M = \frac{25 g}{1 L} \times \frac{1 mol}{10 g}

D. M = \frac{25 g}{1 L} \times \frac{1 mol}{5 g}

Correct Answer: B

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