POST UTME MADONNA UNIVERSITY 2020 Chemistry | Objective

Are you preparing for POST UTME MADONNA UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Chemistry (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
Determine the pH of a 0.1 M solution of HCl.
A. 1
B. 2
C. 3
Correct D. 4

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 2
A 25.0 mL sample of 0.500 M HCl is titrated with 0.100 M NaOH. Calculate the volume of NaOH required to reach the equivalence point.
A. 25.0 mL
B. 50.0 mL
Correct C. 75.0 mL
D. 100 mL

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 3
A diagram of a titration apparatus is shown below. If the burette contains 25.0 mL of 0.500 M HCl, and the initial pH of the solution is 3.00, what is the pH of the solution after 10.0 mL of 0.100 M NaOH has been added?
A. 1.00
Correct B. 2.00
C. 3.00
D. 4.00

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 4
A 2.50 g sample of a subs\tance is dissolved in 50.0 mL of water to give a solution with a concentration of 0.100 M. What is the molar mass of the subs\tance?
A. 20.0 g/mol
B. 40.0 g/mol
Correct C. 60.0 g/mol
D. 80.0 g/mol

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 5
A diagram of a gas apparatus is shown below. If the volume of the gas is 2.50 L at a pressure of 1.00 atm and a temperature of 25.0°C, what is the volume of the gas at a pressure of 2.00 atm and a temperature of 50.0°C?
A. 1.25 L
B. 2.50 L
Correct C. 3.75 L
D. 5.00 L

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 6
The compound SO2 is a product of the combustion of sulfur in oxygen. What is the balanced chemical equation for this reaction?
Correct A. S + O2 → SO2
B. S + O2 → SO3
C. S + O2 → SO4
D. S + O2 → SO5

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 7
The compound SO3 is a product of the combustion of sulfur in oxygen. What is the balanced chemical equation for this reaction?
A. S + O2 → SO2
Correct B. S + O2 → SO3
C. S + O2 → SO4
D. S + O2 → SO5

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 8
The compound SO4 is a product of the combustion of sulfur in oxygen. What is the balanced chemical equation for this reaction?
A. S + O2 → SO2
B. S + O2 → SO3
Correct C. S + O2 → SO4
D. S + O2 → SO5

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 9
The compound SO5 is a product of the combustion of sulfur in oxygen. What is the balanced chemical equation for this reaction?
A. S + O2 → SO2
B. S + O2 → SO3
C. S + O2 → SO4
Correct D. S + O2 → SO5

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 10
The compound SO2 is a product of the combustion of sulfur in oxygen. What is the balanced chemical equation for this reaction?
Correct A. S + O2 → SO2
B. S + O2 → SO3
C. S + O2 → SO4
D. S + O2 → SO5

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 11
A redox reaction involves the transfer of electrons from one species to another. Which of the following is an example of a redox reaction?
A. 2Na (s) + Cl2 (g) → 2NaCl (s)
B. Ca (s) + 2HCl (aq) → CaCl2 (aq) + H2 (g)
Correct C. Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)
D. H2 (g) + F2 (g) → 2HF (g)

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 12
A metal is said to be in its s\tandard state when it is in its most stable form. Which of the following metals is in its s\tandard state?
A. Cu (s)
B. Zn (s)
C. Fe (s)
Correct D. Ag (s)

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 13
The s\tandard enthalpy of formation of a compound is the enthalpy change when one mole of the compound is formed from its constituent elements in their s\tandard states. Which of the following compounds has a negative s\tandard enthalpy of formation?
A. CO (g)
Correct B. H2O (l)
C. NH3 (g)
D. O2 (g)

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 14
The rate of a chemical reaction is affected by the concentration of the reac\tants. Which of the following is a correct statement about the effect of concentration on the rate of a reaction?
A. Increa\sing the concentration of the reac\tants decreases the rate of the reaction.
Correct B. Increa\sing the concentration of the reac\tants increases the rate of the reaction.
C. Decrea\sing the concentration of the reac\tants decreases the rate of the reaction.
D. Decrea\sing the concentration of the reac\tants increases the rate of the reaction.

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 15
A solution contains 2.5 g of NaCl in 100 mL of water. What is the molarity of the solution?
A. 0.1 M
B. 0.2 M
Correct C. 0.5 M
D. 1.0 M

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 16
The reaction of zinc metal with copper(II) sulfate solution is represented by the equation: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). What is the oxidation state of copper in the reac\tant and product?
Correct A. Cu(II) in reac\tant and Cu(0) in product
B. Cu(0) in reac\tant and Cu(II) in product
C. Cu(II) in reac\tant and Cu(II) in product
D. Cu(0) in reac\tant and Cu(0) in product

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 17
A 0.5 M solution of HCl is mixed with a 0.5 M solution of NaOH. What is the pH of the resulting solution?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 18
The diagram below shows a titration setup. What is the purpose of the burette?
Correct A. To measure the volume of the solution
B. To measure the pH of the solution
C. To measure the temperature of the solution
D. To measure the density of the solution

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 19
A sample of a non-metallic element has a mass of 25 g and a volume of 5 cm³. What is the density of the element?
A. 5 g/cm³
Correct B. 10 g/cm³
C. 15 g/cm³
D. 20 g/cm³

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 20
A solution of HCl is mixed with a solution of NaOH. What is the resulting solution?
Correct A. NaCl(aq)
B. H2O(l)
C. NaOH(aq)
D. HCl(aq)

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 21
The rate of reaction between hydrogen peroxide and potassium iodide is influenced by the concentration of the reac\tants. If the concentration of hydrogen peroxide is doubled, what will be the effect on the rate of reaction?
A. The rate of reaction will increase by a factor of 2
Correct B. The rate of reaction will increase by a factor of 4
C. The rate of reaction will remain unchanged
D. The rate of reaction will decrease by a factor of 2

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 22
A sample of a metal oxide was heated in a crucible. The mass of the crucible and the metal oxide before heating was 50.0 g. After heating, the mass of the crucible alone was 49.5 g. What is the mass of the metal oxide that was lost during heating?
Correct A. 0.5 g
B. 1.0 g
C. 1.5 g
D. 2.0 g

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 23
A gas at a pressure of 1.0 atm and a temperature of 20°C is allowed to expand to a volume of 2.0 L. What is the new pressure of the gas?
A. 0.5 atm
Correct B. 1.0 atm
C. 1.5 atm
D. 2.0 atm

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 24
A solution of sulfuric acid (H2SO4) is mixed with a solution of sodium hydroxide (NaOH). The reaction is as follows: H2SO4 + 2NaOH → Na2SO4 + 2H2O. If 25.0 mL of 1.0 M H2SO4 is mixed with 25.0 mL of 1.0 M NaOH, what is the limiting reac\tant?
Correct A. H2SO4
B. NaOH
C. Both are limiting reac\tants
D. Neither is a limiting reac\tant

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 25
A diagram of a titration apparatus is shown below. If the burette contains 25.0 mL of 1.0 M NaOH and the reaction is as follows: HCl + NaOH → NaCl + H2O, what is the concentration of the HCl solution?
A. 0.5 M
Correct B. 1.0 M
C. 1.5 M
D. 2.0 M

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

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:
Chat with Support