POST UTME UNIOSUN 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.00 g sample of a metal is electrolyzed u\sing a current of 2.00 A for 3.00 h. If the metal has a s\tandard reduction potential of -0.80 V, what is the mass of the metal deposited?
A. 0.500 g
B. 0.750 g
C. 1.00 g
D. 1.25 g
Question 2
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) from the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1782 kJ/mol
B. -1785 kJ/mol
C. -1788 kJ/mol
D. -1790 kJ/mol
Question 3
A 50.0 mL sample of a solution containing 0.0500 M K2Cr2O7 is treated with 10.0 mL of 1.00 M H2SO4. Calculate the concentration of Cr3+ ions in the solution.
A. 0.0025 M
B. 0.0050 M
C. 0.0075 M
D. 0.0100 M
Question 4
Determine the major product of the reaction between 2-methylpropene and HCl.
A. 1-chloro-2-methylpropane
B. 2-chloro-2-methylpropane
C. 1-chloro-2-methylbu\tane
D. 2-chloro-2-methylbu\tane
Question 5
Identify the type of reaction represented by the equation: 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g).
A. Synthesis reaction
B. Decomposition reaction
C. Single displacement reaction
D. Double displacement reaction
Question 6
A 2.50 g sample of a metal is electrolyzed u\sing a current of 2.00 A for 3.00 h. If the metal has a s\tandard reduction potential of -0.80 V, what is the mass of the metal deposited?
A. 0.500 g
B. 0.750 g
C. 1.00 g
D. 1.25 g
Question 7
Calculate the molarity of a solution containing 25.0 g of NaCl in 250 mL of water.
A. 0.100 M
B. 0.200 M
C. 0.500 M
D. 1.00 M
Question 8
A 1.00 M solution of NaOH is mixed with a 1.00 M solution of HCl. What is the pH of the resulting solution?
A. 7.00
B. 8.00
C. 9.00
D. 10.0
Question 9
A 25.0 mL sample of a solution containing 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of HCl in the sample.
A. 0.0025 mol
B. 0.0050 mol
C. 0.0075 mol
D. 0.0100 mol
Question 10
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.00 mol of C6H12O6(s).
A. -2800 kJ/mol
B. -2850 kJ/mol
C. -2900 kJ/mol
D. -2950 kJ/mol

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