POST UTME COAL CITY UNIVERSITY 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 0.1 M solution of a weak acid HA is mixed with a 0.1 M solution of a strong base NaOH. If the initial pH of the acid solution is 3.0, what is the pH of the resulting solution after the reaction is complete?
A. 2.0
B. 3.0
C. 4.0
D. 5.0
Question 2
A 0.1 M solution of a weak base B is mixed with a 0.1 M solution of a strong acid HCl. If the initial pOH of the base solution is 4.0, what is the pOH of the resulting solution after the reaction is complete?
A. 2.0
B. 3.0
C. 4.0
D. 5.0
Question 3
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 4
A solution contains 0.1 M HCl and 0.1 M NaOH. What is the pH of the solution?
A. 1
B. 2
C. 3
D. 4
Question 5
A 0.1 M solution of a weak acid HA is mixed with 0.1 M NaOH. If the initial pH of the acid solution is 4.5, what is the pH after the reaction is complete?
A. 4.5
B. 5.5
C. 6.5
D. 7.5
Question 6
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. What is the pH of the solution after the reaction is complete?
A. 1
B. 2
C. 3
D. 4
Question 7
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. What is the pH of the solution after the reaction is complete?
A. 1
B. 2
C. 3
D. 4
Question 8
The reaction of calcium with oxygen is represented by the equation: 2Ca (s) + O2 (g) → 2CaO (s). What is the mass of calcium oxide produced if 2.50 g of calcium is reacted with 100 mL of oxygen?
A. 3.00 g
B. 4.00 g
C. 5.00 g
D. 6.00 g
Question 9
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
D. 4
Question 10
The diagram below shows the titration curve of a weak acid HA with a strong base NaOH.
A. The equivalence point is at pH 7.
B. The equivalence point is at pH 10.
C. The equivalence point is at pH 12.
D. The equivalence point is at pH 14.
Question 11
A 10 mL sample of 0.5 M HCl is titrated with 0.5 M NaOH. What is the pH of the solution after the reaction is complete?
A. 1
B. 2
C. 3
D. 4
Question 12
A 1.0 M solution of a salt MX is prepared by dissolving 36.5 g of MX in 100 mL of water. What is the molarity of the solution?
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 3.0 M
Question 13
The reaction of magnesium with hydrochloric acid is represented by the equation: Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g). If 2.50 g of magnesium is reacted with 100 mL of 2.00 M hydrochloric acid, what is the limiting reac\tant?
A. Magnesium
B. Hydrochloric acid
C. Both are in excess
D. Neither is in excess
Question 14
A solution contains 2.5 g of NaCl per 100 mL of water. Calculate the mass of NaCl in 500 mL of the solution.
A. 1.25 g
B. 2.5 g
C. 3.75 g
D. 5 g
Question 15
A solution contains 2.5 g of NaCl per 100 mL of water. Calculate the molarity of the solution.
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M

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