POST UTME ACHIEVERS UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.5 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 2.5 M
Question 2
A sample of gas at 25°C and 1 atm is heated to 50°C. If the volume of the gas is doubled, what is the new pressure?
A. 2 atm
B. 1 atm
C. 0.5 atm
D. 4 atm
Question 3
A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?
A. 7.00
B. 8.00
C. 9.00
D. 10.0
Question 4
A 1.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the pH of the resulting solution?
A. 0
B. 1
C. 2
D. 3
Question 5
Determine the concentration of a 0.5 M solution of NaOH in g/L, given that the molar mass of NaOH is 40 g/mol.
A. 20 g/L
B. 40 g/L
C. 60 g/L
D. 80 g/L
Question 6
Determine the pH of a solution containing 0.1 M HCl and 0.1 M NaOH.
A. 1
B. 2
C. 3
D. 4
Question 7
A diagram of a gas collection apparatus is shown below.
A. The apparatus is used to collect a gas over water.
B. The apparatus is used to collect a gas over mercury.
C. The apparatus is used to collect a gas over air.
D. The apparatus is used to collect a gas over vacuum.
Question 8
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 20 days?
A. 50 mg
B. 25 mg
C. 12.5 mg
D. 6.25 mg
Question 9
The diagram below shows a titration setup.
A. The burette contains HCl.
B. The beaker contains NaOH.
C. The burette contains NaOH.
D. The beaker contains HCl.
Question 10
A 50 mL sample of 0.1 M HCl is mixed with 50 mL of 0.1 M NaOH. Calculate the pH of the resulting solution.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 11
A 25 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 25 mL
B. 50 mL
C. 75 mL
D. 100 mL
Question 12
The s\tandard enthalpy of formation of H2O(l) is -285.8 kJ/mol. What is the s\tandard enthalpy of combustion of methane (CH4(g))?
A. -890.3 kJ/mol
B. -393.5 kJ/mol
C. 393.5 kJ/mol
D. 890.3 kJ/mol
Question 13
A solution of HCl is prepared by dissolving 10 g of HCl in 100 mL of water. If the density of the solution is 1.2 g/mL, what is the concentration of the solution in molarity?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 14
A 1.0 M solution of hydrochloric acid (HCl) is prepared by dissolving 36.5 g of HCl in 1000 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 1.0 M
C. 10.0 M
D. 100.0 M
Question 15
The s\tandard reduction potential of the couple Cu2+/Cu is +0.34 V. What is the s\tandard cell potential for the reaction: Cu2+ + 2e- → Cu?
A. +0.68 V
B. +0.34 V
C. -0.34 V
D. -0.68 V

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