POST UTME IGBINEDION UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1.00 L sample of a gas at 25°C and 1.00 atm is found to have a volume of 2.00 L at 50°C. Calculate the number of moles of gas present.
A. 0.0100 mol
B. 0.0125 mol
C. 0.0150 mol
D. 0.0175 mol
Question 2
The s\tandard enthalpy of formation of O2(g) is 0 kJ/mol. What is the s\tandard enthalpy of formation of H2O(g)?
A. -285.8 kJ/mol
B. 285.8 kJ/mol
C. 0 kJ/mol
D. 57.8 kJ/mol
Question 3
The s\tandard enthalpy of formation of CO(g) is -110.5 kJ/mol. What is the s\tandard enthalpy of formation of CO2(g)?
A. -393.5 kJ/mol
B. -110.5 kJ/mol
C. 110.5 kJ/mol
D. 393.5 kJ/mol
Question 4
The s\tandard enthalpy of formation of NH3(g) is -45.9 kJ/mol. What is the s\tandard enthalpy of formation of N2(g)?
A. 45.9 kJ/mol
B. -45.9 kJ/mol
C. 0 kJ/mol
D. 90.9 kJ/mol
Question 5
A 2.50 L sample of a gas at 27°C is collected over water at 27°C. The total pressure is 755 mmHg. Calculate the partial pressure of the gas.
A. 550 mmHg
B. 600 mmHg
C. 650 mmHg
D. 700 mmHg
Question 6
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.00250 mol
B. 0.00275 mol
C. 0.00300 mol
D. 0.00325 mol
Question 7
A 2.00 g sample of a compound containing only carbon and hydrogen is found to have an empirical formula of CH2O. Calculate the molar mass of the compound.
A. 46.05 g/mol
B. 46.07 g/mol
C. 46.10 g/mol
D. 46.15 g/mol
Question 8
A 1.0 L solution of 0.1 M H2SO4 is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?
A. 1
B. 7
C. 10
D. 14
Question 9
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. -110.5 kJ/mol
B. -110.5 kJ/mol
C. -110.5 kJ/mol
D. -110.5 kJ/mol
Question 10
The s\tandard enthalpy of formation of H2(g) is 0 kJ/mol. What is the s\tandard enthalpy of formation of H2O(l)?
A. -285.8 kJ/mol
B. 285.8 kJ/mol
C. 0 kJ/mol
D. 57.8 kJ/mol
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 at cons\tant pressure, what is the new volume of the gas?
A. 3.125 L
B. 2.5 L
C. 5 L
D. 6.25 L
Question 12
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
A. -110.5 kJ/mol
B. -393.5 kJ/mol
C. 110.5 kJ/mol
D. 393.5 kJ/mol
Question 13
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 at cons\tant pressure, what is the new volume of the gas?
A. 3.125 L
B. 2.5 L
C. 5 L
D. 6.25 L
Question 14
A solution of 0.1 M HCl is titrated with 0.1 M NaOH. If 20 mL of NaOH is added, what is the pH of the resulting solution?
A. 1
B. 2
C. 3
D. 4
Question 15
The polymerization of styrene to polystyrene is an example of a ______ reaction.
A. chain-growth
B. step-growth
C. condensation
D. addition

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