POST UTME PAN-ATLANTIC UNIVERSITY 2024 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the reaction is complete?
A. 7.00
B. 9.00
C. 10.0
D. 12.0
Question 2
The compound SO2 is a pollu\tant released into the atmosphere. What is the oxidation state of sulfur in this compound?
A. +2
B. -2
C. +4
D. -4
Question 3
A solution contains 20 g of NaCl in 100 g of water. What is the molality of the solution?
A. 0.2 m
B. 0.4 m
C. 0.6 m
D. 0.8 m
Question 4
A gas at 300 K and 1 atm expands from 1 L to 2 L. What is the work done by the gas?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 5
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 6
A 0.1 M solution of HCl is titrated with 0.1 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 7
A 2 M solution of NaOH is titrated with 1 M HCl. What is the pH of the solution at the equivalence point?
A. 7
B. 9
C. 11
D. 13
Question 8
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 9
A 2.50-g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The mass of the metal oxide produced is 1.75 g. What is the empirical formula of the metal carbonate?
A. MgCO3
B. CaCO3
C. FeCO3
D. ZnCO3
Question 10
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization (DP) of 500. Calculate the molar mass of the repeating unit.
A. 200 g/mol
B. 400 g/mol
C. 500 g/mol
D. 1000 g/mol
Question 11
A metal has a density of 10 g/cm^3 and a volume of 50 cm^3. What is the mass of the metal?
A. 500 g
B. 750 g
C. 1000 g
D. 1250 g
Question 12
A metal M (atomic number 20) has a density of 11.4 g/cm^3. If a 2.5 g sample of the metal is dissolved in 100 mL of 1 M HCl, what is the concentration of the metal ion in the solution?
A. 0.01 M
B. 0.1 M
C. 0.5 M
D. 1 M
Question 13
The compound CO2 is a greenhouse gas. What is the oxidation state of carbon in this compound?
A. +4
B. +2
C. +3
D. +1
Question 14
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 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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