POST UTME ELIZADE UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sample of a gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the temperature is increased to 300 K, what is the new volume of the gas?
A. 3.5 L
B. 4.5 L
C. 5.5 L
D. 6.5 L
Question 2
A metal (X) reacts with oxygen to form a white solid. The reaction is as follows: 4X + 3O2 → 2X2O3. If 2 g of X reacts with 1 g of O2, what is the mass of X2O3 formed?
A. 3.5 g
B. 4.5 g
C. 5.5 g
D. 6.5 g
Question 3
A 2.50 M solution of HCl is titrated with a 1.00 M solution of NaOH. Calculate the pH of the solution after 25.0 mL of NaOH has been added.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 4
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. Calculate the pKa of the acid.
A. 3.5
B. 4.5
C. 5.5
D. 6.5
Question 5
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. Calculate the pH of the solution after 20 mL of HCl has been added to 100 mL of the NaOH solution.
A. 1
B. 2
C. 3
D. 4
Question 6
A diagram of the periodic table is shown below. Identify the group to which the element with atomic number 36 belongs.
A. 1
B. 2
C. 3
D. 4
Question 7
What is the major product of the reaction between 2-methylpropene and HCl?
A. 2-chloro-2-methylpropane
B. 2-chloro-2-methylbu\tane
C. 2-chloro-2-methylpen\tane
D. 2-chloro-2-methylhexane
Question 8
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 addition of 15.0 mL of NaOH?
A. 2.00
B. 3.00
C. 4.00
D. 5.00
Question 9
What is the pH of a 0.10 M solution of HCl?
A. 0.00
B. 1.00
C. 2.00
D. 3.00
Question 10
A 25 mL sample of 0.5 M NaOH is titrated with 0.5 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.0125
B. 0.025
C. 0.0375
D. 0.05
Question 11
Determine the number of moles of CO2 produced when 2.50 g of calcium carbonate (CaCO3) is heated in a stream of oxygen gas.
A. 0.0250 mol
B. 0.0500 mol
C. 0.0750 mol
D. 0.100 mol
Question 12
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. If 20 mL of HCl is required to reach the equivalence point, what is the volume of NaOH required to reach the equivalence point in a 50 mL solution?
A. 50 mL
B. 100 mL
C. 150 mL
D. 200 mL
Question 13
A metal (X) reacts with oxygen to form a basic oxide. The oxide is soluble in water and gives a basic solution. The metal (X) is likely to be:
A. Al
B. Mg
C. Ca
D. Na
Question 14
The polymerization of styrene in the presence of benzoyl peroxide as an initiator yields a polymer with a molecular weight of 50,000 g/mol. If the degree of polymerization is 200, what is the molecular weight of the monomer?
A. 200 g/mol
B. 250 g/mol
C. 300 g/mol
D. 400 g/mol
Question 15
A 2 M solution of a salt (Na2SO4) is prepared by dissolving 2 g of the salt in 100 mL of water. What is the molarity of the solution?
A. 1 M
B. 2 M
C. 3 M
D. 4 M

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