POST UTME COVENANT UNIVERSITY 2023 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 25.0 mL sample of a solution containing 0.100 M NaCl is titrated with 0.100 M AgNO3. Calculate the number of moles of AgNO3 required to reach the equivalence point.
A. 0.0025 moles
B. 0.0050 moles
C. 0.0075 moles
D. 0.0100 moles
Question 2
Determine the number of moles of oxygen gas (O2) produced at s\tandard temperature and pressure (STP) when 2.5 moles of hydrogen gas (H2) react with oxygen gas according to the balanced equation: 2H2 + O2 → 2H2O.
A. 1.25 moles
B. 2.5 moles
C. 5 moles
D. 10 moles
Question 3
A sample of a polymer has a molecular weight of 50,000 g/mol. If 2.5 g of the polymer is dissolved in 100 mL of solvent, calculate the concentration of the solution in g/L.
A. 0.05 g/L
B. 0.10 g/L
C. 0.20 g/L
D. 0.50 g/L
Question 4
A 100 mL sample of a solution containing 0.050 M HCl is titrated with 0.050 M NaOH. Calculate the pH of the solution after the addition of 50 mL of NaOH.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 5
A 2.0 L sample of a gas at 25°C and 1.0 atm is compressed to 5.0 atm at cons\tant temperature. Calculate the final volume of the gas.
A. 0.4 L
B. 0.8 L
C. 1.2 L
D. 1.6 L

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