POST UTME SKYLINE UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A gas at 300 K has a pressure of 1 atm. If the temperature is increased to 400 K, what is the new pressure of the gas?
A. 1.5 atm
B. 2 atm
C. 2.5 atm
D. 3 atm
Question 2
The diagram below shows a titration setup. What is the purpose of the burette?
A. To measure the volume of the titrant
B. To measure the volume of the analyte
C. To mix the titrant and analyte
D. To measure the pH of the solution
Question 3
The diagram below shows a circuit setup. What is the purpose of the resistor?
A. To reduce the voltage of the circuit
B. To increase the current of the circuit
C. To measure the voltage of the circuit
D. To measure the current of the circuit
Question 4
A 2.50 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. If the mass of the metal oxide produced is 1.75 g, calculate the percentage yield of the metal oxide.
A. 50%
B. 60%
C. 70%
D. 80%
Question 5
A 50.0 mL sample of 0.200 M HCl is mixed with a 50.0 mL sample of 0.150 M NaOH. What is the resulting pH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 6
A 25.0 mL sample of 0.150 M NaOH is mixed with a 25.0 mL sample of 0.100 M HCl. What is the resulting pH?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 7
The half-life of a radioactive subs\tance is 5 days. If 100 mg of the subs\tance is initially present, how much will remain after 15 days?
A. 12.5 mg
B. 25 mg
C. 50 mg
D. 100 mg
Question 8
A 20.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 30.0 mL of NaOH.
A. 2.00
B. 2.00
C. 2.00
D. 2.00
Question 9
A solution of sodium hydroxide (NaOH) is titrated with a solution of hydrochloric acid (HCl). If 25.0 mL of 0.100 M NaOH is required to neutralize 20.0 mL of HCl, what is the concentration of the HCl solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 10
A solution of sodium hydroxide (NaOH) is titrated with a solution of hydrochloric acid (HCl). If 25.0 mL of 0.100 M NaOH is required to neutralize 20.0 mL of HCl, what is the concentration of the HCl solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 11
A gas at 300 K and 1 atm expands to 2 atm at cons\tant temperature. What is the new volume?
A. 1.5 L
B. 2 L
C. 3 L
D. 4 L
Question 12
The half-life of a radioactive subs\tance is 5 days. If 100 mg of the subs\tance is initially present, how much will remain after 15 days?
A. 12.5 mg
B. 25 mg
C. 50 mg
D. 100 mg
Question 13
Determine the oxidation state of the chromium atom in the complex ion [Cr(H2O)6]3+.
A. +2
B. +3
C. +6
D. +7
Question 14
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(g) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and that of O2(g) is 0 kJ/mol.
A. 0 kJ/mol
B. -241.8 kJ/mol
C. -393.5 kJ/mol
D. -285.8 kJ/mol
Question 15
The s\tandard enthalpy of formation for CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of combustion of 1.00 mol of C(s).
A. -393.5 kJ/mol
B. -393.5 kJ/mol
C. -393.5 kJ/mol
D. -393.5 kJ/mol

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