Practice Post UTME VERITAS UNIVERSITY chemistry 2024 Past Questions

Question 1 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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 View Details

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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