POST UTME RHEMA UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of H2SO4 is prepared by dissolving 10 g of H2SO4 in 100 mL of water. What is the concentration of H+ ions in the solution?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 2
A 1.0 M solution of HCl is prepared by dissolving 36.5 g of HCl in 1000 mL of water. Calculate the molarity of the solution.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 3
A 1.0 M solution of HCl is titrated with 1.0 M NaOH. The initial pH of the solution is 2.0. What is the pH of the solution after the addition of 50 mL of 1.0 M NaOH?
A. 3.0
B. 4.0
C. 5.0
D. 6.0
Question 4
A 2.0 M solution of HCl is titrated with 1.0 M NaOH. What is the pH of the solution after 25 mL of NaOH has been added?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 5
A 1 M solution of NaOH is prepared by dissolving 40 g of NaOH in 100 mL of water. What is the concentration of OH- ions in the solution?
A. 0.5 M
B. 1 M
C. 2 M
D. 4 M
Question 6
A metal (M) reacts with hydrochloric acid (HCl) to produce hydrogen gas and a salt. If 2.5 g of M reacts with 10 mL of 2 M HCl, what is the molar mass of M?
A. 50 g/mol
B. 100 g/mol
C. 150 g/mol
D. 200 g/mol
Question 7
A 0.500 M solution of HCl is mixed with 0.500 M solution of NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 8
A gas at 200 K has a volume of 2 L. If the temperature is increased to 300 K, what is the new volume?
A. 3 L
B. 4 L
C. 5 L
D. 6 L
Question 9
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the initial concentration of HA?
A. 0.05 M
B. 0.1 M
C. 0.2 M
D. 0.5 M
Question 10
A 1.00 L solution of 0.100 M HCl is mixed with 1.00 L of 0.100 M NaOH. What is the pH of the resulting solution?
A. 1.00
B. 2.00
C. 3.00
D. 4.00
Question 11
Determine the molar mass of a polymer with the following composition: 60% polyethylene (C2H4), 20% polypropylene (C3H6), and 20% polystyrene (C8H8).
A. 60 g/mol
B. 120 g/mol
C. 180 g/mol
D. 240 g/mol
Question 12
The reaction between sodium hydroxide and hydrochloric acid is represented by the equation: NaOH + HCl -> NaCl + H2O. If 20 mL of 0.1 M NaOH is added to 20 mL of 0.1 M HCl, calculate the concentration of the resulting solution.
A. 0.05
B. 0.1
C. 0.15
D. 0.2
Question 13
The diagram below shows a chemical apparatus setup. Identify the part labeled B.
A. Beaker
B. Burette
C. Test tube
D. Cylinder
Question 14
Determine the pH of a 0.1 M solution of HCl. The dissociation cons\tant of HCl is 10^\( -7 \).
A. 1
B. 2
C. 3
D. 4
Question 15
A 250 mL sample of a solution containing 0.1 M NaOH is titrated with 0.1 M HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 50
B. 100
C. 150
D. 200

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