POST UTME LASU 2020 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
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 3
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 4
A 50 mL sample of 0.1 M HCl is titrated with 0.1 M NaOH. What is the pH of the solution after 10 mL of NaOH has been added?
A. 1
B. 2
C. 3
D. 4
Question 5
A 0.1 M solution of sodium chloride is prepared by dissolving 6.0 g of sodium chloride in water to make 100 mL of solution. Calculate the molarity of the solution.
A. 0.2 M
B. 0.3 M
C. 0.4 M
D. 0.5 M
Question 6
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) u\sing the following reaction: CaO(s) + CO2(g) → CaCO3(s).
A. -1793.5 kJ/mol
B. -1793.5 kJ/mol
C. -1793.5 kJ/mol
D. -1793.5 kJ/mol
Question 7
The s\tandard electrode potential for the reaction Zn2+ + 2e- → Zn is -0.76 V. Calculate the s\tandard electrode potential for the reaction Zn → Zn2+ + 2e-.
A. 0.76 V
B. -0.76 V
C. 1.52 V
D. -1.52 V
Question 8
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 9
A 25.0 mL sample of a solution containing 0.100 M NaOH is titrated with 0.100 M HCl. Calculate the number of moles of HCl required to reach the equivalence point.
A. 0.0025 moles
B. 0.0050 moles
C. 0.0075 moles
D. 0.0100 moles
Question 10
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 11
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 12
A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M $\text{NaOH}($aq$)$ is required to neutralize 25.0 mL of an acidic solution, what is the concentration of the acidic solution?
A. 0.0500 M
B. 0.100 M
C. 0.200 M
D. 0.500 M
Question 13
A 2.0 M solution of NaOH is titrated with 1.0 M HCl. Calculate the pH of the solution after 20 mL of HCl has been added.
A. 2.0
B. 2.0
C. 2.0
D. 2.0
Question 14
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 15
The solubility of a sparingly soluble salt, lead(II) chloride, is 0.001 g/L at 25°C. Calculate the molar solubility of the salt.
A. 1.0 × 10^\( -4 \) M
B. 2.0 × 10^\( -4 \) M
C. 3.0 × 10^\( -4 \) M
D. 4.0 × 10^\( -4 \) M

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: