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POST UTME VERITAS UNIVERSITY 2025 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 2025 Chemistry (Objective) questions designed to simulate the real exam environment.

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Question 1

A 2.5 L sample of a gas at 27°C and 1.2 atm is collected over water. Calculate the partial pressure of the gas.

Correct A. 1.1 atm

B. 1.2 atm

C. 1.3 atm

D. 1.4 atm

Correct Answer: A

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Question 2

A solution containing 0.5 M NaCl and 0.2 M CaCl2 is prepared. What is the concentration of Cl- ions in the solution?

A. 0.6 M

B. 0.7 M

Correct C. 0.8 M

D. 0.9 M

Correct Answer: C

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Question 3

A 2.5 L sample of a gas at 27°C and 1.2 atm is collected over water. Calculate the partial pressure of the gas.

Correct A. 1.1 atm

B. 1.2 atm

C. 1.3 atm

D. 1.4 atm

Correct Answer: A

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Question 4

A solution containing 0.5 M NaCl and 0.2 M CaCl2 is prepared. What is the concentration of Cl- ions in the solution?

A. 0.6 M

B. 0.7 M

Correct C. 0.8 M

D. 0.9 M

Correct Answer: C

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Question 5

A 2.5 L sample of a gas at 27°C and 1.2 atm is collected over water. Calculate the partial pressure of the gas.

Correct A. 1.1 atm

B. 1.2 atm

C. 1.3 atm

D. 1.4 atm

Correct Answer: A

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Question 6

The reaction between chlorine gas and sodium hydroxide solution is represented by the equation: Cl2 + 2NaOH → NaCl + NaClO + H2O. What is the oxidation state of chlorine in the product NaClO?

A. 0

B. +1

C. +2

Correct D. +3

Correct Answer: D

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Question 7

A 2.5 M solution of sodium hydroxide is prepared by dissolving 12.5 g of NaOH in water to make 250 mL of solution. What is the concentration of the solution in units of molarity?

A. 0.1 M

B. 0.5 M

C. 1.0 M

Correct D. 2.5 M

Correct Answer: D

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Question 8

The solubility of a sparingly soluble salt is given by the equation: S = Ksp / [A]^x [B]^y. If the solubility product cons\tant (Ksp) of a salt is 1.0 × 10^\( -5 \) and the concentrations of the ions are [A] = 0.1 M and [B] = 0.01 M, what is the solubility of the salt?

Correct A. 1.0 × 10^\( -4 \) M

B. 1.0 × 10^\( -3 \) M

C. 1.0 × 10^\( -2 \) M

D. 1.0 × 10^\( -1 \) M

Correct Answer: A

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Question 9

A 100 mL sample of a solution containing 0.5 M NaCl is titrated with 0.5 M AgNO3. What is the volume of AgNO3 required to reach the equivalence point?

A. 50 mL

Correct B. 100 mL

C. 150 mL

D. 200 mL

Correct Answer: B

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Question 10

The rate cons\tant (k) of a first-order reaction is given by the equation: k = 2.303 / t \log10 \( A0 / A \). If the initial concentration (A0) of a reac\tant is 1.0 M and the concentration (A) after a certain time (t) is 0.5 M, what is the rate cons\tant (k)?

A. 0.1 min^\( -1 \)

B. 0.5 min^\( -1 \)

Correct C. 1.0 min^\( -1 \)

D. 2.0 min^\( -1 \)

Correct Answer: C

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Question 11

A metal alloy is composed of 75% copper and 25% zinc. If 500 grams of the alloy is melted and cast into a new shape, what is the mass of copper in the new shape?

Correct A. 375 g

B. 250 g

C. 375.5 g

D. 375.25 g

Correct Answer: A

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Question 12

A solution of 0.1 M NaOH is titrated with 0.1 M HCl. What is the pH of the solution after 25 mL of HCl has been added?

A. 1

B. 2

Correct C. 3

D. 4

Correct Answer: C

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Question 13

A diagram of a titration setup is shown below. The burette contains 0.1 M HCl, and the flask contains 25 mL of 0.1 M NaOH. What is the pH of the solution after 10 mL of HCl has been added?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 14

A metal has an atomic number of 20 and an atomic mass of 40 g/mol. What is the number of protons in the nucleus of an atom of this metal?

Correct A. 20

B. 40

C. 20.5

D. 40.5

Correct Answer: A

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Question 15

A diagram of a periodic table is shown below. Which element has an atomic number of 6?

A. C

Correct B. N

C. O

D. F

Correct Answer: B

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Question 16

The reaction between chlorine gas and potassium iodide is a classic example of a redox reaction. Write the balanced chemical equation for this reaction, including the state of each reac\tant and product.

A. Cl2 + 2KI → KCl + I2

Correct B. Cl2 + 2KI → 2KCl + I2

C. Cl2 + KI → KCl + I2

D. Cl2 + 2KI → KCl + 2I2

Correct Answer: B

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Question 17

A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. Calculate the pressure of the gas u\sing the ideal gas law.

Correct A. 1.01 × 10^5 Pa

B. 2.02 × 10^5 Pa

C. 3.03 × 10^5 Pa

D. 4.04 × 10^5 Pa

Correct Answer: A

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Question 18

The half-life of a radioactive subs\tance is 5 years. If the initial amount of the subs\tance is 100 g, what is the amount remaining after 10 years?

Correct A. 12.5 g

B. 25 g

C. 50 g

D. 100 g

Correct Answer: A

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Question 19

A solution contains 0.1 M NaCl. What is the concentration of Cl- ions in the solution?

Correct A. 0.05 M

B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: A

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Question 20

The diagram below shows a titration setup. What is the purpose of the burette?

Correct A. To measure the volume of the solution

B. To measure the concentration of the solution

C. To mix the solution with the analyte

D. To separate the solution from the analyte

Correct Answer: A

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Question 21

The rate cons\tant (k) for a first-order reaction is given by the equation: k = Ae^\( -Ea/RT \). If the activation energy (Ea) is 100 kJ/mol, the gas cons\tant (R) is 8.314 J/mol*K, and the temperature (T) is 300 K, what is the value of the rate cons\tant (k) if the pre-exponential factor (A) is 1.0 x 10^10 s^-1?

A. 1.0 x 10^6 s^-1

B. 1.0 x 10^7 s^-1

Correct C. 1.0 x 10^8 s^-1

D. 1.0 x 10^9 s^-1

Correct Answer: C

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Question 22

A 0.1 M solution of HCl is titrated with 0.1 M NaOH. If 20 mL of HCl is added to 20 mL of NaOH, what is the pH of the resulting solution?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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Question 23

The half-life of a radioactive subs\tance is 10 years. If a sample of the subs\tance has an initial activity of 100 Bq, what is its activity after 20 years?

Correct A. 12.5 Bq

B. 25 Bq

C. 50 Bq

D. 100 Bq

Correct Answer: A

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Question 24

A 1.0 M solution of NaOH is titrated with 1.0 M HCl. If 20 mL of HCl is added to 20 mL of NaOH, what is the concentration of the resulting solution?

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 25

A 0.1 M solution of HCl is titrated with 0.1 M NaOH. If 20 mL of HCl is added to 20 mL of NaOH, what is the pH of the resulting solution?

A. 1

B. 2

C. 3

Correct D. 4

Correct Answer: D

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