POST UTME LEAD CITY UNIVERSITY 2021 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction between H2(g) and Cl2(g) is represented by the equation: H2(g) + Cl2(g) → 2HCl(g). If 1.00 mol of H2(g) reacts with 1.00 mol of Cl2(g), what is the limiting reac\tant?
A. H2(g)
B. Cl2(g)
C. Neither H2(g) nor Cl2(g) is the limiting reac\tant.
D. Both H2(g) and Cl2(g) are the limiting reac\tants.
Question 2
A 0.500 g sample of a metal carbonate is heated to produce a metal oxide and carbon dioxide gas. The mass of the metal oxide is 0.350 g. Calculate the percentage of metal in the original sample.
A. 15.0%
B. 20.0%
C. 25.0%
D. 30.0%
Question 3
A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 250 mL of water. Calculate the molarity of the solution.
A. 0.100 M
B. 0.200 M
C. 0.300 M
D. 0.400 M
Question 4
A sample of a hydrocarbon has a molecular formula of C5H12. What is the type of hydrocarbon?
A. Alkane
B. Alkene
C. Alkyne
D. Aromatic
Question 5
A 2.50 g sample of a metal is heated in a crucible to produce a metal oxide. The mass of the metal oxide is 3.25 g. Calculate the percentage of oxygen in the metal oxide.
A. 20.0%
B. 25.0%
C. 30.0%
D. 35.0%
Question 6
A 0.500 M solution of HCl is prepared by dissolving 10.0 g of HCl in 1.00 L of water. Calculate the molar solubility of HCl.
A. 0.100 M
B. 0.500 M
C. 1.00 M
D. 2.00 M
Question 7
The diagram below shows a titration setup. Identify the part labeled A.
A. Burette
B. Beaker
C. Test Tube
D. Cylinder
Question 8
A mixture of 2.0 g of NaCl and 1.0 g of KCl is dissolved in 100 mL of water. What is the concentration of Cl- ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 9
A 100 mL sample of a solution containing 0.5 M HCl is titrated with 0.5 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 50 mL
B. 75 mL
C. 100 mL
D. 125 mL
Question 10
A gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 25°C. Calculate the volume of the gas at a pressure of 3.0 atm and a temperature of 50°C.
A. 3.0 L
B. 4.0 L
C. 5.0 L
D. 6.0 L
Question 11
A 3.00 g sample of a metal is heated in a crucible to produce a metal oxide. The mass of the metal oxide is 4.25 g. Calculate the percentage of metal in the original sample.
A. 25.0%
B. 30.0%
C. 35.0%
D. 40.0%
Question 12
The diagram below shows a chemical apparatus setup. Identify the part labeled B.
A. Beaker
B. Test Tube
C. Burette
D. Cylinder
Question 13
A 2.5 g sample of a compound containing only carbon and hydrogen is found to have a mass of 1.25 g when burned in oxygen to produce carbon dioxide and water. Calculate the empirical formula of the compound.
A. CH2
B. CH3
C. C2H4
D. C2H6
Question 14
Determine the molar mass of a polymer with the repeating unit (C6H5O2)n. Given that the molar mass of the repeating unit is 138.12 g/mol, calculate the molar mass of the polymer.
A. 138.12 g/mol
B. 276.24 g/mol
C. 414.36 g/mol
D. 552.48 g/mol
Question 15
A sample of a polymer has a molecular weight of 50000 g/mol. If 2.5 g of the polymer is dissolved in 100 mL of water, what is the concentration of the solution in g/L?
A. 0.05
B. 0.1
C. 0.2
D. 0.5

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