POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2022 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The metal with the highest melting point in the first transition series is ______.
A. Sc
B. Ti
C. V
D. Cr
Question 2
The s\tandard enthalpy of formation of CO is -110.5 kJ/mol. What is the s\tandard enthalpy of formation of CO2?
A. -393.5 kJ/mol
B. -283.4 kJ/mol
C. -74.8 kJ/mol
D. -110.5 kJ/mol
Question 3
A 2.5 M solution of HCl is titrated with 1.5 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 4
A solution of HCl is 0.5 M in H+ ions. What is the concentration of Cl- ions in the solution?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 5
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 12.5 mL
B. 25.0 mL
C. 37.5 mL
D. 50.0 mL
Question 6
A 1.0 M solution of NaOH is mixed with a 1.0 M solution of HCl. If the reaction is complete, what is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 7
A solution of H2SO4 is 0.5 M in H+ ions. What is the concentration of HSO4- ions in the solution?
A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M
Question 8
The polymerization of styrene to polystyrene is an example of a ______ reaction.
A. chain-growth
B. step-growth
C. condensation
D. addition
Question 9
A 2.50 L sample of a gas at 25°C and 1.00 atm is collected over water at 25°C. If the vapor pressure of water at 25°C is 23.8 torr, what is the partial pressure of the gas?
A. 0.976 atm
B. 0.987 atm
C. 0.998 atm
D. 1.00 atm
Question 10
The reaction of hydrogen with chlorine to form hydrogen chloride is an example of a ______ reaction.
A. combustion
B. oxidation
C. reduction
D. substitution
Question 11
A metal M reacts with oxygen to form a basic oxide MO. The reaction is as follows: 4M + 3O2 → 2MO + 6e- . What is the oxidation state of M?
A. +2
B. +3
C. +4
D. +5
Question 12
A 0.500 L flask contains 0.250 mol of an ideal gas at 298 K. Calculate the number of moles of gas present in a 2.00 L flask at the same temperature.
A. 0.500 mol
B. 0.750 mol
C. 1.00 mol
D. 1.25 mol
Question 13
The reaction between sodium and chlorine to form sodium chloride is an example of a ______ reaction.
A. Combustion
B. Redox
C. Neutralization
D. Synthesis
Question 14
A 1.00 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1.00 L of water. What is the molarity of the solution?
A. 0.50 M
B. 1.00 M
C. 1.50 M
D. 2.00 M
Question 15
The density of a gas is 1.2 g/L at 25°C and 1 atm. What is the molar mass of the gas?
A. 12 g/mol
B. 24 g/mol
C. 36 g/mol
D. 48 g/mol

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