POST UTME ESUT 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A reaction is represented by the equation: 2A + B → 2C + D. If the rate of disappearance of A is 0.05 mol/L·s and the rate of appearance of C is 0.02 mol/L·s, what is the rate of appearance of D?
A. 0.01 mol/L·s
B. 0.02 mol/L·s
C. 0.03 mol/L·s
D. 0.04 mol/L·s
Question 2
A polymer has a molecular weight of 50000 g/mol and a degree of polymerization of 200. Calculate the molar mass of the repeating unit.
A. 250 g/mol
B. 500 g/mol
C. 750 g/mol
D. 1000 g/mol
Question 3
Determine the number of moles of nitrogen gas (N2) produced when 2.5 g of ammonia (NH3) is decomposed at cons\tant pressure and temperature.
A. 0.05 mol
B. 0.10 mol
C. 0.15 mol
D. 0.20 mol
Question 4
A 0.5 M solution of HCl is titrated with 0.5 M NaOH. If 25 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point?
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 5
A diagram of a titration setup is shown below. If 25 mL of 0.1 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 6
A solution containing 0.1 M Fe2+ ions is mixed with a solution containing 0.1 M SCN- ions. Calculate the concentration of the complex ion [Fe(SCN)6]4- formed after the reaction is complete.
A. \( K = \frac{[Fe\( SCN \ \)_6]^{4-}}{[Fe^{2+}] [SCN^-]^6} )
B. \( K = \frac{[Fe\( SCN \ \)_6]^{4-}}{[Fe^{2+}] [SCN^-]^3} )
C. \( K = \frac{[Fe\( SCN \ \)_6]^{4-}}{[Fe^{2+}] [SCN^-]^2} )
D. \( K = \frac{[Fe\( SCN \ \)_6]^{4-}}{[Fe^{2+}] [SCN^-]^5} )
Question 7
A solution of HCl is titrated with a solution of NaOH. The initial pH of the HCl solution is 2. If 25 mL of the NaOH solution is added, the pH of the solution increases to 3. What is the concentration of the NaOH solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 8
Determine the number of moles of CO2 produced from the combustion of 2.5 g of glu\cose (C6H12O6) in the presence of excess oxygen.
A. 0.25 mol
B. 0.5 mol
C. 1.0 mol
D. 1.25 mol
Question 9
A 2.0 M solution of H2SO4 is mixed with a 2.0 M solution of NaOH. Calculate the concentration of the resulting solution.
A. \( [H_2SO_4] = 1.0 M \)
B. \( [NaOH] = 1.0 M \)
C. \( [H_2SO_4] = 0.5 M \)
D. \( [NaOH] = 0.5 M \)
Question 10
A solution of sulfuric acid (H2SO4) is prepared by dissolving 50 g of H2SO4 in 100 mL of water. Calculate the molar concentration of the solution. The molar mass of H2SO4 is 98.08 g/mol.
A. 0.51 M
B. 0.51 g/mol
C. 0.51 L
D. 0.51 g
Question 11
The atomic structure of an element is characterized by the number of protons, neutrons, and electrons present in its atoms. What is the term for the number of protons present in the nucleus of an atom?
A. Atomic number
B. Mass number
C. Proton number
D. Electron number
Question 12
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 100 mL of water. Calculate the molar concentration of the solution. The molar mass of NaCl is 58.44 g/mol.
A. 0.61 M
B. 0.61 g/mol
C. 0.61 L
D. 0.61 g
Question 13
A diagram of a gas collection apparatus is shown below. If 250 mL of gas is collected at a pressure of 750 mmHg and a temperature of 25°C, what is the volume of the gas at STP?
A. 1.0 L
B. 1.5 L
C. 2.0 L
D. 2.5 L
Question 14
A gas has a pressure of 2 atm and a volume of 10 L. If the temperature is increased to 300 K, what is the new volume?
A. 10 L
B. 20 L
C. 30 L
D. 40 L
Question 15
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the pH of the solution after 25 mL of NaOH has been added.
A. 2
B. 3
C. 4
D. 5

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