POST UTME PAN-ATLANTIC UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.50 g sample of a non-metallic oxide of nitrogen is decomposed by heating with graphite in a stream of hydrogen gas. The volume of hydrogen gas collected at 25°C and 1 atm is 2.00 L. Calculate the empirical formula of the oxide.
A. N2O
B. NO
C. N2O2
D. N2O3
Question 2
A solution contains 0.1 M NaCl. Calculate the concentration of Cl^- ions.
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 3
A 2.5 g sample of a compound containing only carbon and hydrogen is analyzed by combustion. If 1.2 g of CO2 is collected, what is the empirical formula of the compound?
A. CH4
B. C2H6
C. C3H8
D. C4H10
Question 4
A sample of a hydrocarbon has a molecular weight of 100 g/mol. If the density of the sample is 0.5 g/mL, calculate the volume of the sample in mL.
A. 10
B. 20
C. 50
D. 100
Question 5
A solution contains 0.01 M HCl. Calculate the pH of the solution.
A. 1
B. 2
C. 3
D. 4
Question 6
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the volume of NaOH required to reach the equivalence point?
A. 25.0 mL
B. 50.0 mL
C. 75.0 mL
D. 100 mL
Question 7
A 50.0 mL sample of 0.100 M H2SO4 is mixed with 50.0 mL of 0.100 M NaOH. What is the concentration of the resulting solution?
A. 0.0500 M
B. 0.100 M
C. 0.050 M
D. 0.200 M
Question 8
A solution of NaOH is prepared by dissolving 4 g of NaOH in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 9
Determine the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C. The dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 10
A solution of sodium chloride is prepared by dissolving 35.5 g of NaCl in 250 mL of water. What is the molarity of the solution?
A. 0.15 M
B. 0.30 M
C. 0.45 M
D. 0.60 M
Question 11
Determine the pH of a 0.1 M solution of HCl if 25 mL of 0.1 M NaOH is added to 50 mL of the HCl solution.
A. 1
B. 2
C. 3
D. 4
Question 12
A polymer chain has a degree of polymerization (DP) of 1000. If the polymer is composed of 80% monomer A and 20% monomer B, what is the average molecular weight of the polymer?
A. 80000 g/mol
B. 90000 g/mol
C. 100000 g/mol
D. 110000 g/mol
Question 13
The electrolysis of water produces hydrogen gas at the cathode and oxygen gas at the anode. What is the half-reaction at the cathode?
A. Oxidation of water
B. Reduction of water
C. Oxidation of hydrogen ions
D. Reduction of oxygen ions
Question 14
A metal alloy has a composition of 60% copper, 20% zinc, and 20% tin. If the density of the alloy is 8.5 g/cm^3, what is the mass of 100 cm^3 of the alloy?
A. 700 g
B. 800 g
C. 900 g
D. 1000 g
Question 15
A diagram of a titration setup is shown below. 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 separate the titrant and analyte

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