Practice Post UTME VERITAS UNIVERSITY chemistry 2024 Past Questions

Question 1

Determine the number of moles of oxygen gas (O2) produced at STP when 2.50 g of potassium chlorate (KClO3) decomposes according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).

A. 0.050 mol

Correct B. 0.100 mol

C. 0.150 mol

D. 0.200 mol

Correct Answer: B

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Question 2

A 2.00 L flask contains 0.500 atm of He gas at 298 K. What is the pressure of the gas in the flask if the volume is increased to 4.00 L at cons\tant temperature?

A. 0.125 atm

Correct B. 0.250 atm

C. 0.500 atm

D. 1.00 atm

Correct Answer: B

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Question 3

The diagram below shows a titration setup. Identify the part labeled A.

Correct A. Burette

B. Beaker

C. Conical Flask

D. Pipette

Correct Answer: A

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Question 4

A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH in a 2.00 L flask. What is the pH of the resulting solution?

A. 1.00

Correct B. 2.00

C. 3.00

D. 4.00

Correct Answer: B

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Question 5

The diagram below shows a simple black and white chemistry apparatus showing titration setup. Identify the part labeled A.

Correct A. Burette

B. Beaker

C. Conical Flask

D. Pipette

Correct Answer: A

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Question 6

The energy change for the reaction 2A(g) → B(g) + C(g) is -120 kJ/mol. If the reaction is carried out at cons\tant volume, what is the value of Δn for the reaction?

A. 2

B. -2

Correct C. 1

D. -1

Correct Answer: C

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Question 7

The half-life of a radioactive subs\tance is 5 days. If 100 mg of the subs\tance is initially present, how much of the subs\tance will remain after 15 days?

Correct A. 12.5 mg

B. 25 mg

C. 50 mg

D. 100 mg

Correct Answer: A

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Question 8

A solution containing 2.5 g of glu\cose (C6H12O6) is mixed with 250 mL of water. What is the molarity of the resulting solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.5 M

D. 1.0 M

Correct Answer: B

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Question 9

A 2.0 M solution of NaOH is mixed with a 2.0 M solution of HCl. 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 10

A sample of a gas occupies 250 mL at a pressure of 1.0 atm. What is the volume of the gas at a pressure of 2.0 atm?

A. 125 mL

B. 250 mL

Correct C. 500 mL

D. 1000 mL

Correct Answer: C

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Question 11

A 2.50-g sample of a non-metallic oxide of nitrogen is decomposed by heating with graphite. The volume of nitrogen gas produced at 25°C and 1.00 atm is 2.50 L. Calculate the molar mass of the oxide.

A. 60.0 g/mol

Correct B. 80.0 g/mol

C. 100.0 g/mol

D. 120.0 g/mol

Correct Answer: B

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Question 12

A solution of sodium hydroxide (NaOH) is prepared by dissolving 25.0 g of NaOH in 250 mL of water. Calculate the molarity of the solution.

A. 0.10 M

B. 0.25 M

Correct C. 0.50 M

D. 1.00 M

Correct Answer: C

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Question 13

A 5.00-g sample of a polymer is dissolved in 100 mL of a solvent. The solution is then titrated with a 0.100 M solution of a strong acid. If 25.0 mL of the acid is required to reach the equivalence point, calculate the number-average molecular weight of the polymer.

A. 1000 g/mol

Correct B. 2000 g/mol

C. 3000 g/mol

D. 4000 g/mol

Correct Answer: B

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Question 14

A 10.0-g sample of a non-metallic oxide of sulfur is dissolved in 100 mL of water. The solution is then titrated with a 0.100 M solution of a strong base. If 50.0 mL of the base is required to reach the equivalence point, calculate the molar mass of the oxide.

A. 80.0 g/mol

B. 100.0 g/mol

C. 120.0 g/mol

Correct D. 140.0 g/mol

Correct Answer: D

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Question 15

A 5.00-g sample of a polymer is dissolved in 100 mL of a solvent. The solution is then titrated with a 0.100 M solution of a strong acid. If 25.0 mL of the acid is required to reach the equivalence point, calculate the weight-average molecular weight of the polymer.

A. 2000 g/mol

B. 3000 g/mol

Correct C. 4000 g/mol

D. 5000 g/mol

Correct Answer: C

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Question 16

A sample of an ideal gas at 25°C and 1 atm is heated to 100°C at cons\tant pressure. What is the ratio of the final volume to the initial volume?

A. 2

Correct B. \frac{5}{4}

C. \frac{4}{5}

D. 4

Correct Answer: B

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Question 17

A metal oxide has the formula M2O3. If 2.50 g of the oxide is dissolved in acid to produce 0.750 L of oxygen gas at 25°C and 1 atm, what is the molar mass of the metal M?

Correct A. 40.0 g/mol

B. 50.0 g/mol

C. 60.0 g/mol

D. 70.0 g/mol

Correct Answer: A

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Question 18

A solution of HCl is 0.100 M. What is the pH of a 0.500 L sample of this solution?

Correct A. 1.00

B. 2.00

C. 3.00

D. 4.00

Correct Answer: A

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Question 19

A metal has the following electron configuration: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5. What is the oxidation state of the metal in its compounds?

A. +2

B. +3

C. +4

Correct D. +5

Correct Answer: D

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Question 20

A sample of a metal alloy contains 85% copper and 15% zinc by mass. If a 250 g sample of the alloy is dissolved in acid to produce 0.500 L of copper(II) sulfate solution at 25°C and 1 atm, what is the molar mass of the metal alloy?

A. 100.0 g/mol

Correct B. 150.0 g/mol

C. 200.0 g/mol

D. 250.0 g/mol

Correct Answer: B

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Question 21

A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. If 25 mL of the acid is titrated, what is the pH of the resulting solution?

A. 3

Correct B. 4

C. 5

D. 6

Correct Answer: B

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Question 22

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 g/mol

B. 400 g/mol

Correct C. 500 g/mol

D. 600 g/mol

Correct Answer: C

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Question 23

A reaction has an equilibrium cons\tant of 10^\( -3 \). If the initial concentrations of the reac\tants are 0.1 M and 0.1 M, what is the equilibrium concentration of the product?

Correct A. 0.01 M

B. 0.1 M

C. 0.5 M

D. 1 M

Correct Answer: A

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Question 24

A 1.0 M solution of a weak acid is titrated with 1.0 M NaOH. If 20 mL of the acid is titrated, what is the pH of the resulting solution?

A. 2

B. 3

Correct C. 4

D. 5

Correct Answer: C

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Question 25

A 0.1 M solution of a monoprotic acid is titrated with 0.1 M NaOH. If 30 mL of the acid is titrated, what is the pH of the resulting solution?

A. 3

Correct B. 4

C. 5

D. 6

Correct Answer: B

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