POST UTME UNIPORT 2025 Chemistry | Objective

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Question 1
A sample of 5.0 g of a subs\tance is dissolved in 100 mL of water to give a solution with a pH of 7.0. What is the concentration of the solution in M?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 2
The reaction between potassium permanganate and sulfuric acid is a classic example of an oxidation-reduction reaction. Which of the following best describes the products of the reaction?
A. MnSO4 and H2SO4
B. MnSO4 and SO2
C. MnO2 and H2SO4
D. MnO2 and SO2
Question 3
Determine the number of moles of electrons transferred during the electrolysis of 2.5 L of 0.5 M H2SO4.
A. 1.25 mol
B. 2.5 mol
C. 5.0 mol
D. 7.5 mol
Question 4
Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of potassium chlorate (KClO3) decompose according to the equation: 2KClO3(s) → 2KCl(s) + 3O2(g).
A. 1.5 moles
B. 2.5 moles
C. 3.75 moles
D. 4.5 moles
Question 5
A polymer has a molecular weight of 5000 g/mol and a degree of polymerization of 100. Calculate the molar mass of the repeating unit.
A. 50 g/mol
B. 100 g/mol
C. 200 g/mol
D. 500 g/mol
Question 6
A solution of 0.1 M NaOH is prepared by dissolving 4.0 g of NaOH in 100 mL of water. What is the concentration of the solution in g/L?
A. 4.0 g/L
B. 40 g/L
C. 400 g/L
D. 4000 g/L
Question 7
A 2.0 M solution of sulfuric acid (H2SO4) has a volume of 1.0 liter. Calculate the number of moles of sulfuric acid present.
A. 0.5 moles
B. 1.0 moles
C. 1.5 moles
D. 2.0 moles
Question 8
Determine the rate cons\tant (k) for the reaction: A → B + C, given that the initial concentration of A is 0.1 M and the concentration of B at time t = 10 min is 0.05 M. The rate law is first order with respect to A.
A. \( k = \frac{2.303}{t} \log \frac{[A]_0}{[A]_t} \)
B. \( k = \frac{2.303}{t} \log \frac{[B]_t}{[B]_0} \)
C. \( k = \frac{[A]_0 - [A]_t}{t} \)
D. \( k = \frac{[B]_t}{t} \)
Question 9
A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 200. What is the molar mass of the repeating unit?
A. 500 g/mol
B. 1000 g/mol
C. 2000 g/mol
D. 2500 g/mol
Question 10
A metal has a density of 10 g/cm^3. What is the mass of 20 cm^3 of the metal?
A. 100 g
B. 200 g
C. 300 g
D. 400 g
Question 11
A metal has a density of 8 g/cm^3. What is the volume of 100 g of the metal?
A. 5 cm^3
B. 10 cm^3
C. 15 cm^3
D. 20 cm^3
Question 12
The entropy change for the following reaction is given by ΔS = 50 J/K. What is the change in entropy for the reverse reaction?
A. -50 J/K
B. 50 J/K
C. 100 J/K
D. -100 J/K
Question 13
A solution of 0.1 M NaCl is prepared by dissolving 6.0 g of NaCl in 100 mL of water. What is the concentration of the solution in g/L?
A. 0.6 g/L
B. 6.0 g/L
C. 60 g/L
D. 600 g/L
Question 14
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 monomer?
A. 200 g/mol
B. 400 g/mol
C. 500 g/mol
D. 1000 g/mol
Question 15
A gas has a pressure of 3 atm at a temperature of 400 K. What is the pressure of the gas at a temperature of 300 K?
A. 1 atm
B. 2 atm
C. 3 atm
D. 4 atm

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