POST UTME EKSU 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A solution contains 0.5 M NaCl and 0.2 M CaCl2. Calculate the total concentration of Cl- ions in the solution.
A. 0.7 M
B. 0.6 M
C. 0.5 M
D. 0.4 M
Question 2
The reaction of potassium permanganate with hydrogen peroxide in acidic medium is a classic example of a redox reaction. The reaction is represented by the equation: \( 2KMnO_4 + 3H_2O_2 + H_2SO_4 \rightarrow K_2SO_4 + 2MnSO_4 + 4H_2O + 3O_2 \). What is the oxidation state of manganese in the product MnSO_4?
A. +2
B. +4
C. +6
D. +7
Question 3
A 1.0 L sample of a solution containing 0.5 M HCl is titrated with 0.5 M NaOH. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 4
A gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 25°C. Calculate the volume of the gas at a pressure of 3.0 atm and a temperature of 50°C.
A. 1.0 L
B. 1.5 L
C. 2.0 L
D. 2.5 L
Question 5
A solution of 0.100 M NaOH is mixed with a solution of 0.100 M HCl. What is the concentration of the resulting solution?
A. 0.100 M
B. 0.0500 M
C. 0.0500 M
D. 0.0500 M
Question 6
Determine the pH of a 0.1 M solution of HCl at 25°C. The dissociation cons\tant of HCl is 10^\( -7 \).
A. 3
B. 4
C. 5
D. 6
Question 7
A 50 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the pH of the solution after the addition of 25 mL of NaOH.
A. 2
B. 3
C. 4
D. 5
Question 8
Calculate the s\tandard enthalpy of formation of CO2(g) from the following data: ΔHf(CO2(g)) = -393.5 kJ/mol, ΔHf(C(s)) = -394.4 kJ/mol, ΔHf(O2(g)) = 0 kJ/mol.
A. -393.5 kJ/mol
B. -394.4 kJ/mol
C. -393.5 kJ/mol + 0 kJ/mol
D. -394.4 kJ/mol + 0 kJ/mol
Question 9
The diagram below represents the structure of a hydrocarbon. What is the name of the hydrocarbon?
A. Cyclohexane
B. Benzene
C. Ethene
D. Propane
Question 10
The diagram below shows the titration of a strong acid with a strong base. What is the pH of the solution at the equivalence point?
A. 7
B. 9
C. 10
D. 12
Question 11
A sample of a gas at 25°C and 1 atm occupies a volume of 2.5 L. If the temperature is increased to 50°C and the pressure remains cons\tant, what is the new volume of the gas?
A. 1.67 L
B. 2.5 L
C. 3.33 L
D. 4.17 L
Question 12
A 50 mL sample of a 0.1 M solution of sodium hydroxide (NaOH) is titrated with a 0.1 M solution of hydrochloric acid (HCl). What is the pH of the resulting solution after the reaction is complete?
A. 1
B. 2
C. 7
D. 14
Question 13
A sample of an ideal gas at 25°C and 1 atm is heated to 100°C at cons\tant pressure. Calculate the new volume of the gas, given that the initial volume is 2.5 L.
A. 5.0 L
B. 6.25 L
C. 7.5 L
D. 8.0 L
Question 14
A 2.50 M solution of NaOH is mixed with a 2.50 M solution of HCl. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 15
The reaction between methane and chlorine to form chloromethane and hydrogen chloride is an example of a(n)
A. substitution reaction
B. elimination reaction
C. addition reaction
D. condensation reaction

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