POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2018 Chemistry | Objective

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Question 1
A 50.0 mL sample of 0.500 M HCl is titrated with 0.100 M NaOH. What is the pH of the solution after the addition of 25.0 mL of NaOH?
A. 2
B. 3
C. 4
D. 5
Question 2
A 0.500 M solution of HCl is prepared by dissolving 25.0 g of HCl in enough water to make 1.00 L of solution. Calculate the pH of the solution.
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 3
A 2.5 M solution of HCl is prepared by dissolving 25 g of HCl in water to make 1 L of solution. What is the molarity of the solution?
A. 2.5 M
B. 5 M
C. 10 M
D. 20 M
Question 4
A 1.5 M solution of H2SO4 is prepared by dissolving 75 g of H2SO4 in water to make 1 L of solution. What is the molarity of the solution?
A. 1.5 M
B. 3 M
C. 4.5 M
D. 6 M
Question 5
A 0.5 M solution of NaOH is prepared by dissolving 20 g of NaOH in water to make 1 L of solution. What is the molarity of the solution?
A. 0.5 M
B. 1 M
C. 1.5 M
D. 2 M
Question 6
A 0.1 M solution of NaOH is prepared by dissolving 4 g of NaOH in water to make 1 L of solution. What is the molarity of the solution?
A. 0.1 M
B. 0.5 M
C. 1 M
D. 2 M
Question 7
What is the major advantage of u\sing a distillation column in the separation of a mixture of liquids?
A. It allows for the separation of a mixture of liquids based on their boiling points.
B. It allows for the separation of a mixture of liquids based on their densities.
C. It allows for the separation of a mixture of liquids based on their molecular weights.
D. It allows for the separation of a mixture of liquids based on their solubilities.
Question 8
The reaction of sodium hydroxide with hydrochloric acid is represented by the equation: NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l). Calculate the number of moles of sodium chloride formed when 2.50 g of NaOH is mixed with 2.50 g of HCl.
A. 0.050 mol
B. 0.100 mol
C. 0.150 mol
D. 0.200 mol
Question 9
A 25.0 mL sample of 0.500 M NaOH is titrated with 0.100 M HCl. What is the pH of the solution after the addition of 25.0 mL of HCl?
A. 2
B. 3
C. 4
D. 5
Question 10
A 1.0 M solution of K2Cr2O7 is reduced by a 1.0 M solution of FeSO4. What is the ratio of the number of moles of Fe2+ produced to the number of moles of Cr3+ produced?
A. 1:1
B. 2:1
C. 3:1
D. 4:1
Question 11
The reaction of 2.50 g of sodium (Na) with water produces 1.00 L of hydrogen gas at 25°C and 1 atm. Calculate the number of moles of sodium used in the reaction.
A. 0.0500 mol
B. 0.100 mol
C. 0.150 mol
D. 0.200 mol
Question 12
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If the initial pH of the solution is 4.5, what is the pH after the addition of 20 mL of 0.1 M NaOH?
A. 4.5
B. 5.5
C. 6.5
D. 7.5
Question 13
A 0.8 M solution of NaOH is prepared by dissolving 32 g of NaOH in water to make 1 L of solution. What is the molarity of the solution?
A. 0.8 M
B. 1.2 M
C. 1.6 M
D. 2 M
Question 14
A 0.500 M solution of NaOH is prepared by dissolving 25.0 g of NaOH in enough water to make 1.00 L of solution. Calculate the pH of the solution.
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 15
A 1 M solution of H2SO4 is prepared by dissolving 49 g of H2SO4 in water to make 1 L of solution. What is the molarity of the solution?
A. 1 M
B. 2 M
C. 3 M
D. 4 M

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