POST UTME IMS U 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol.
A. -1785.6 kJ/mol
B. -1785.9 kJ/mol
C. -1786.1 kJ/mol
D. -1786.3 kJ/mol
Question 2
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 3
A 2.5 L flask contains 0.15 mol of an unknown gas at 298 K. If the pressure of the gas is 1.5 atm, what is the unknown gas?
A. O2
B. N2
C. CO2
D. H2
Question 4
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 5
A 2.0 L flask contains 0.2 M HCl. If 20 mL of 1.0 M NaOH is added to the flask, what is the concentration of OH^- ions in the solution?
A. 0.01 M
B. 0.02 M
C. 0.05 M
D. 0.1 M
Question 6
A metal (M) reacts with oxygen to form a basic oxide. The reaction is represented by the equation: 4M + 3O2 → 2M2O3. If 2.5 g of M is heated in air, what is the volume of oxygen required at STP?
A. 1.5 L
B. 2.0 L
C. 2.5 L
D. 3.0 L
Question 7
The s\tandard enthalpy of formation of CO2(g) is -393.51 kJ/mol. What is the s\tandard enthalpy of combustion of methane (CH4(g))?
A. -890.3 kJ/mol
B. -890.4 kJ/mol
C. -890.5 kJ/mol
D. -890.6 kJ/mol
Question 8
A 2.0 L flask contains 0.2 mol of an unknown gas at 298 K. If the pressure of the gas is 2.0 atm, what is the unknown gas?
A. O2
B. N2
C. CO2
D. H2
Question 9
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. What is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 0.25 M
D. 0.75 M
Question 10
A solution of glu\cose (C6H12O6) is prepared by dissolving 10 g of glu\cose in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1.0 M
D. 2.0 M
Question 11
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 12
At 298 K, the s\tandard enthalpy of formation of CO2(g) from its elements is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g) from its elements?
A. -110.5 kJ/mol
B. -393.5 kJ/mol
C. -74.8 kJ/mol
D. -283.0 kJ/mol
Question 13
A 2.0 L flask contains 1.0 g of CO2 at 25°C. If the pressure of the flask is doubled, what is the new volume of the gas?
A. 1.0 L
B. 1.5 L
C. 2.0 L
D. 2.5 L
Question 14
A 1.0 L flask contains 0.5 M H2SO4. If 10 mL of 2.0 M NaOH is added to the flask, what is the concentration of H+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.5 M
D. 1.0 M
Question 15
A metal (M) reacts with oxygen to form a basic oxide. The reaction is as follows: 4M + 3O2 → 2MO3. If 2.5 g of M is heated in air, what is the volume of O2 consumed?
A. 1.5 L
B. 2.5 L
C. 3.75 L
D. 5.0 L

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