POST UTME LASU 2020 Chemistry | Objective

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Question 1
A 25 mL sample of 0.5 M H2SO4 is titrated with 0.5 M NaOH. What is the pH of the solution after 15 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 2
A 2.0 M solution of NaCl is electrolyzed u\sing a platinum electrode. Calculate the mass of Cl2 gas produced at the anode after 1 hour, given that the current is 0.5 A and the cell potential is 2.0 V.
A. 0.25 g
B. 0.25 g
C. 0.25 g
D. 0.25 g
Question 3
Determine the number of moles of oxygen gas (O2) produced at s\tandard temperature and pressure (STP) when 2.5 moles of hydrogen gas (H2) react with oxygen gas according to the equation: 2H2 + O2 → 2H2O.
A. 1.0 mole
B. 2.0 moles
C. 3.0 moles
D. 4.0 moles
Question 4
A solution contains 5.0 g of NaCl in 250 cm3 of water. What is the concentration of the solution in g/dm3?
A. 20 g/dm3
B. 25 g/dm3
C. 30 g/dm3
D. 35 g/dm3
Question 5
A 200 mL sample of 0.05 M H2SO4 is titrated with 0.05 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 6
The diagram below shows a circuit with a battery, a resistor, and a switch. What is the current flowing through the circuit when the switch is closed?
A. 1 A
B. 2 A
C. 3 A
D. 4 A
Question 7
A 1.0 M solution of NH3 is mixed with 1.0 M HCl. Calculate the pH of the solution.
A. 9.25
B. 9.25
C. 9.25
D. 9.25
Question 8
The diagram below shows a simple black and white chemistry apparatus setup for a distillation process. If the boiling point of the liquid being distilled is 100°C, what is the temperature of the condenser?
A. 90°C
B. 95°C
C. 99°C
D. 100°C
Question 9
A 10.0 mL sample of a solution containing 0.0500 M FeCl3 is titrated with 0.0500 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.0025 moles
B. 0.0050 moles
C. 0.0075 moles
D. 0.0100 moles
Question 10
A 100 mL sample of 0.2 M CH3COOH is titrated with 0.2 M NaOH. What is the pH of the solution after 20 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 11
A 2.0 M solution of NaOH is titrated with 1.0 M HCl. Calculate the pH of the solution after 25 mL of HCl has been added.
A. 2.0
B. 2.0
C. 2.0
D. 2.0
Question 12
A sample of N2 gas at 25°C and 1 atm is compressed to 5 atm. Calculate the new volume of the gas, given that the temperature remains cons\tant.
A. 0.2 L
B. 0.2 L
C. 0.2 L
D. 0.2 L
Question 13
A 2.0 M solution of HCl is titrated with 1.0 M NaOH. Calculate the pH of the solution after 30 mL of NaOH has been added.
A. 2.0
B. 2.0
C. 2.0
D. 2.0
Question 14
Determine the number of moles of $\text{H}_2$ produced when 2.5 moles of $\text{Ca}($s$)$ react with excess $\text{HCl}($aq$)$ according to the equation $\text{Ca}($s$) + 2\text{HCl}($aq$) \rightarrow \text{CaCl}_2($aq$) + \text{H}_2($g$)$.
A. 1.25
B. 2.5
C. 3.75
D. 5.0
Question 15
A 1.5 M solution of H2SO4 is mixed with 1.5 M NaOH. Calculate the pH of the solution.
A. 0.5
B. 0.5
C. 0.5
D. 0.5

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