POST UTME OSUSTECH 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 50 mL sample of 0.2 M sodium hydroxide is titrated with 0.2 M hydrochloric acid. Calculate the volume of hydrochloric acid required to reach the equivalence point.
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 2
A solution of sodium hydroxide is titrated with a solution of hydrochloric acid. The initial pH of the solution is 10.0. If 50.0 cm3 of 0.100 M HCl is added to 50.0 cm3 of 0.200 M NaOH, calculate the number of moles of NaCl produced.
A. 0.0050 mol
B. 0.010 mol
C. 0.015 mol
D. 0.020 mol
Question 3
A 25 mL sample of 0.1 M hydrochloric acid is titrated with 0.1 M sodium hydroxide. Calculate the volume of sodium hydroxide required to reach the equivalence point.
A. 12.5 mL
B. 25 mL
C. 37.5 mL
D. 50 mL
Question 4
A 1.0 L solution of a subs\tance is prepared by dissolving 20 g of the subs\tance in 1.0 L of water. What is the molar solubility of the subs\tance?
A. 0.5 M
B. 1.0 M
C. 2.0 M
D. 4.0 M
Question 5
A 2.50 L container holds 0.500 mol of CO2 at 25°C. What is the partial pressure of CO2 in the container?
A. 0.500 atm
B. 1.00 atm
C. 2.00 atm
D. 5.00 atm
Question 6
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 15.0 mL of NaOH.
A. 2.00
B. 2.50
C. 3.00
D. 3.50
Question 7
A polymer is composed of repeating units of the following structure: CH2-CH2-CH2-CH2. What is the name of this polymer?
A. Polyethylene
B. Polypropylene
C. Polyvinyl chloride
D. Polystyrene
Question 8
A 2.0 M solution of a subs\tance is prepared by dissolving 40 g of the subs\tance in 1.0 L of water. What is the molar mass of the subs\tance?
A. 80 g/mol
B. 120 g/mol
C. 160 g/mol
D. 200 g/mol
Question 9
A 2.0 M solution of a subs\tance is prepared by dissolving 40 g of the subs\tance in 1.0 L of water. What is the molar mass of the subs\tance?
A. 80 g/mol
B. 120 g/mol
C. 160 g/mol
D. 200 g/mol
Question 10
A 2.0 M solution of a subs\tance is prepared by dissolving 40 g of the subs\tance in 1.0 L of water. What is the concentration of the subs\tance in a 2.0 L solution?
A. 1.0 M
B. 2.0 M
C. 4.0 M
D. 8.0 M
Question 11
A 2.50 L container holds 0.500 mol of O2 at 25°C. What is the partial pressure of O2 in the container?
A. 0.500 atm
B. 1.00 atm
C. 2.00 atm
D. 5.00 atm
Question 12
A 2.0 M solution of a subs\tance is prepared by dissolving 40 g of the subs\tance in 1.0 L of water. What is the concentration of the subs\tance in a 2.0 L solution?
A. 1.0 M
B. 2.0 M
C. 4.0 M
D. 8.0 M
Question 13
The diagram below shows a titration setup. Identify the subs\tance being titrated.
A. Sodium hydroxide
B. Hydrochloric acid
C. Sulfuric acid
D. Nitric acid
Question 14
The reaction between ethanol and sulfuric acid is a classic example of an acid-catalyzed dehydration reaction. Write the balanced chemical equation for this reaction, including the state of each subs\tance.
A. \text{C}_2\text{H}_5\text{OH} + \text{H}_2\text{SO}_4 \rightarrow \text{C}_2\text{H}_4 + \text{H}_2\text{O} + \text{HSO}_4^-
B. \text{C}_2\text{H}_5\text{OH} + \text{H}_2\text{SO}_4 \rightarrow \text{C}_2\text{H}_4 + \text{H}_2\text{O} + \text{H}_2\text{SO}_4
C. \text{C}_2\text{H}_5\text{OH} + \text{H}_2\text{SO}_4 \rightarrow \text{C}_2\text{H}_4 + \text{H}_2\text{O} + \text{H}_2\text{O}
D. \text{C}_2\text{H}_5\text{OH} + \text{H}_2\text{SO}_4 \rightarrow \text{C}_2\text{H}_4 + \text{H}_2\text{O} + \text{SO}_4^2-
Question 15
The reaction between sulfuric acid and sodium hydroxide is a classic example of a double displacement reaction. Write the balanced chemical equation for this reaction, including the state of each subs\tance.
A. \text{H}_2\text{SO}_4 + 2\text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + 2\text{H}_2\text{O}
B. \text{H}_2\text{SO}_4 + \text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + \text{H}_2\text{O}
C. \text{H}_2\text{SO}_4 + 2\text{NaOH} \rightarrow \text{Na}_2\text{SO}_4 + \text{H}_2\text{O}
D. \text{H}_2\text{SO}_4 + \text{NaOH} \rightarrow \text{H}_2\text{O} + \text{Na}_2\text{SO}_4

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