POST UTME LEAD CITY UNIVERSITY 2018 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
At 273.15 K, 1 mole of an ideal gas occupies a volume of 22.4 L. If the temperature is increased to 373.15 K, what is the new volume of the gas, assuming it remains ideal?
A. 44.8 L
B. 22.4 L
C. 11.2 L
D. 5.6 L
Question 2
A solution of 2.0 g of sodium chloride in 100 g of water has a boiling point of 100.5°C. What is the molality of the solution?
A. 0.10 m
B. 0.20 m
C. 0.30 m
D. 0.40 m
Question 3
A 2.5 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 2.0 g, what is the percentage yield of the reaction?
A. 80%
B. 60%
C. 40%
D. 20%
Question 4
A sample of sodium chloride (NaCl) is dissolved in water to form a saturated solution. What is the concentration of sodium ions \( Na+ \) in the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 5 M
Question 5
Determine the number of unpaired electrons in the ground state of a chromium atom, given that chromium has an atomic number of 24 and its electron configuration is [Ar] 3d5 4s1.
A. 1
B. 2
C. 3
D. 4
Question 6
A 1.0 L sample of a gas at 25°C and 1.0 atm is compressed to 2.0 L at the same temperature. What is the new pressure of the gas?
A. 2.0 atm
B. 4.0 atm
C. 6.0 atm
D. 8.0 atm
Question 7
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. What is the pressure of the gas?
A. \( 1.0 , \text{atm} \)
B. \( 1.1 , \text{atm} \)
C. \( 1.2 , \text{atm} \)
D. \( 1.3 , \text{atm} \)
Question 8
A solution contains 0.5 M HCl and 0.2 M NaOH. Determine the pH of the resulting solution.
A. 1
B. 2
C. 3
D. 4
Question 9
A 25.0 mL sample of 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the pH of the solution after the addition of 25.0 mL of HCl.
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 10
Determine the pH of a 0.1 M solution of HCl at 25°C, given that the dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 11
Determine the number of moles of oxygen gas (O2) produced at STP when 2.5 moles of hydrogen gas (H2) react with excess oxygen gas according to the equation: 2H2 + O2 → 2H2O.
A. 1.25 moles
B. 2.5 moles
C. 3.75 moles
D. 5 moles
Question 12
In the electrolysis of a solution of copper(II) sulfate, what is the primary product at the cathode?
A. Oxygen gas
B. Hydrogen gas
C. Copper metal
D. Sulfuric acid
Question 13
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 14
A 2.0 M solution of sulfuric acid (H2SO4) is mixed with a 1.0 M solution of sodium hydroxide (NaOH). What is the concentration of the resulting solution?
A. 0.5 M
B. 1.0 M
C. 1.5 M
D. 2.0 M
Question 15
A 1.0 g sample of a protein is hydrolyzed and the resulting amino acids are separated by chromatography. The chromatogram shows a \single peak with a retention time of 10 minutes. Calculate the molar mass of the protein.
A. 1000 g/mol
B. 2000 g/mol
C. 3000 g/mol
D. 4000 g/mol

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