POST UTME AL-HIKMAH UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. If the gas is heated to 50°C, what is the new pressure of the gas?
A. 101325 Pa
B. 202650 Pa
C. 303875 Pa
D. 404100 Pa
Question 2
A 5 L flask contains 0.5 mol of an ideal gas at 25°C. If the gas is compressed to 2 L, what is the new pressure of the gas?
A. 101325 Pa
B. 202650 Pa
C. 303875 Pa
D. 404100 Pa
Question 3
Determine the structure of the compound with the molecular formula C5H12O.
A. \( CH_3CH_2CH_2CH_2CH_3 \)
B. \( CH_3CH_2CH_2CH_2OH \)
C. \( CH_3CH_2CH_2CH_2CH_2OH \)
D. \( CH_3CH_2CH_2CH_2CH_2CH_3 \)
Question 4
A 40 mL sample of 0.4 M H2SO4 is titrated with 0.4 M NaOH. Calculate the pH of the solution at the equivalence point.
A. 1
B. 2
C. 3
D. 4
Question 5
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1792.5 kJ/mol
B. -1792.5 kJ/mol
C. -1792.5 kJ/mol
D. -1792.5 kJ/mol
Question 6
A 0.1 M solution of HCl is titrated with 0.1 M NaOH. Calculate the pH of the solution after 50 mL of NaOH has been added.
A. 1
B. 2
C. 3
D. 4
Question 7
A sample of a polymer has a molecular weight of 50,000 g/mol. If 2.5 g of the polymer is dissolved in 100 mL of solvent, what is the concentration of the solution in g/L?
A. 0.05 g/L
B. 0.5 g/L
C. 5 g/L
D. 50 g/L
Question 8
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. If the gas is heated to 50°C, what is the new concentration of the gas?
A. 0.2 M
B. 0.3 M
C. 0.4 M
D. 0.5 M
Question 9
A 5 L flask contains 0.5 mol of an ideal gas at 25°C. If the gas is compressed to 2 L, what is the new concentration of the gas?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1 M
Question 10
A 2.50 M solution of HCl(aq) is mixed with a 1.00 M solution of NaOH(aq). If the reaction is allowed to go to completion, what is the concentration of the resulting solution?
A. 1.25 M
B. 2.50 M
C. 3.75 M
D. 5.00 M
Question 11
The s\tandard Gibbs free energy change for the reaction 2NO(g) + O2(g) → 2NO2(g) is -110 kJ/mol. Calculate the equilibrium cons\tant (K) for the reaction.
A. 1.0 x 10^10
B. 1.0 x 10^10
C. 1.0 x 10^10
D. 1.0 x 10^10
Question 12
A diagram of a redox reaction is shown below. What is the oxidation state of the manganese ion in the compound MnO2?
A. +4
B. +2
C. 0
D. -2
Question 13
A solution contains 0.1 M NaCl and 0.2 M CaCl2. What is the concentration of Cl- ions in the solution?
A. 0.3 M
B. 0.2 M
C. 0.1 M
D. 0.4 M
Question 14
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.8 atm
B. 2.1 atm
C. 2.5 atm
D. 3.0 atm
Question 15
A 2.0 L flask contains 1.0 g of CO2 at 25°C. What is the partial pressure of CO2 in the flask?
A. 0.1 atm
B. 0.5 atm
C. 1.0 atm
D. 2.0 atm

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