POST UTME VERITAS UNIVERSITY 2025 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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
C. 3
D. 4
Question 2
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.
A. 1.01 × 10^5 Pa
B. 2.02 × 10^5 Pa
C. 3.03 × 10^5 Pa
D. 4.04 × 10^5 Pa
Question 3
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?
A. 375 g
B. 250 g
C. 375.5 g
D. 375.25 g
Question 4
A 1.0 M solution of a salt is prepared by dissolving 1.0 g of the salt in 100 mL of water. If the density of the solution is 1.2 g/mL, what is the molarity of the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 5
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
B. 100 mL
C. 150 mL
D. 200 mL
Question 6
A 2.0 g sample of a salt is dissolved in 100 mL of water to prepare a solution. If the density of the solution is 1.2 g/mL, what is the molarity of the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 7
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?
A. 12.5 g
B. 25 g
C. 50 g
D. 100 g
Question 8
A sample of a gas at 25°C and 1 atm is compressed to 2 atm at cons\tant temperature. What is the new volume of the gas?
A. 0.5 L
B. 1 L
C. 2 L
D. 4 L
Question 9
A 1.0 M solution of a salt is prepared by dissolving 1.0 g of the salt in 100 mL of water. If the density of the solution is 1.2 g/mL, what is the molarity of the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 10
A 1.0 M solution of a salt is prepared by dissolving 1.0 g of the salt in 100 mL of water. If the density of the solution is 1.2 g/mL, what is the molarity of the solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 11
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
D. 4
Question 12
A diagram of a periodic table is shown below. Which element has an atomic number of 6?
A. C
B. N
C. O
D. F
Question 13
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
B. Cl2 + 2KI → 2KCl + I2
C. Cl2 + KI → KCl + I2
D. Cl2 + 2KI → KCl + 2I2
Question 14
The diagram below shows a titration setup. What is the purpose of the burette?
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
Question 15
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
C. 1.0 x 10^8 s^-1
D. 1.0 x 10^9 s^-1

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