FBISE · Class 9

Class 9 Chemistry MCQs: Electrochemistry

Practice chapter-wise MCQs with answers and explanations. Use the quiz mode for timed online tests.

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Quick revision

Class 9 Chemistry MCQs Electrochemistry are one of the fastest ways to improve your board exam performance — especially when you practice with purpose, revise weak concepts, and learn from explanations.

On Prepzy, you can practice 57 MCQs from “Electrochemistry” in Chemistry for FBISE. Each question is designed to mirror the style, wording, and concept-testing approach used in Pakistani board papers.

Use this chapter page to revise definitions, formulas, and key ideas, then attempt the MCQs in small sets. Track patterns in your mistakes: is it a concept gap, a calculation error, or a misread statement? Fixing the pattern is what raises your score.

If you’re preparing for matric / SSC Part exams, focus on understanding the concept first, then speed. MCQs reward clarity — not memorization. A clear concept turns into fast correct answers.

What to focus on

  • Primary focus: Electrochemistry concepts tested in Class 9 Chemistry
  • Practice with instant answer-checking to reduce repeated mistakes
  • Revise common definitions, units, and standard results before timed practice
  • Aim for accuracy first, then build speed with short quizzes

Study tips

  • Read the question stem first, then scan options for distractors (near-correct choices).
  • If the chapter is formula-heavy, write a mini-formula sheet and revise it before every attempt.
  • After each practice set, re-attempt only the wrong MCQs to convert weak areas into strengths.
  • Mix easy + medium MCQs for momentum, then finish with hard questions for exam readiness.

MCQs (sample)

Showing 25 questions from this chapter. For a full timed test, use “Start online test”.

  1. 1. What is an oxidizing agent?

    • A substance that causes another to oxidize by taking electrons
    • A substance that donates electrons
    • A substance that remains unchanged
    • A substance that loses hydrogen ions
    Answer & explanation

    Correct: A substance that causes another to oxidize by taking electrons

    An oxidizing agent accepts electrons during a reaction, causing another substance to oxidize.

  2. 2. What is a fundamental characteristic of oxidation-reduction (redox) reactions?

    • They involve the transfer of oxygen, hydrogen, and electrons.
    • They only occur at high temperatures.
    • They do not release energy.
    • They can only occur in liquids.
    Answer & explanation

    Correct: They involve the transfer of oxygen, hydrogen, and electrons.

    Redox reactions are defined by the transfer of oxygen, hydrogen, and electrons, which is a fundamental characteristic.

  3. 3. What is the definition of oxidation state?

    • The number of charges an atom will have in a molecule or compound.
    • The total number of atoms in a molecule.
    • The mass of an atom in grams per mole.
    • The state of matter of a compound.
    Answer & explanation

    Correct: The number of charges an atom will have in a molecule or compound.

    Oxidation state or oxidation number is defined as the number of charges an atom will have in a molecule or a compound.

  4. 4. What is the first step to determine the formula of an ionic compound?

    • Identify the ions and their charges
    • Write the formula with subscripts
    • Balance the charges
    • Use Roman numerals
    Answer & explanation

    Correct: Identify the ions and their charges

    The first step is to identify the ions and their charges.

  5. 5. What process is referred to as corrosion?

    • An electrochemical reaction involving metal and its environment
    • A physical change in metal properties
    • A reaction where metal heats up
    • A reaction that increases metal weight
    Answer & explanation

    Correct: An electrochemical reaction involving metal and its environment

    Corrosion is defined as a natural electrochemical process that occurs when a metal reacts with its environment.

  6. 6. Which of the following is an example of an oxidizing agent?

    • Hydrogen gas (H2)
    • Potassium permanganate (KMnO4)
    • Zinc (Zn)
    • Carbon monoxide (CO)
    Answer & explanation

    Correct: Potassium permanganate (KMnO4)

    Potassium permanganate (KMnO4) is listed as an example of an oxidizing agent.

  7. 7. Which process is NOT an application of redox reactions?

    • Rusting of iron
    • Burning of fuels in car engines
    • Decomposition of water into hydrogen and oxygen
    • Production of electricity in batteries
    Answer & explanation

    Correct: Decomposition of water into hydrogen and oxygen

    The decomposition of water into hydrogen and oxygen is not explicitly mentioned as a redox application in the content.

  8. 8. According to the provided content, which process corresponds to oxidation?

    • Gain of oxygen
    • Gain of hydrogen
    • Gain of electrons
    • Decrease in oxidation number
    Answer & explanation

    Correct: Gain of oxygen

    The gain of oxygen is listed as a process leading to oxidation.

  9. 9. In the compound calcium chloride, what is the charge of the calcium ion?

    • +2
    • -1
    • +1
    • -2
    Answer & explanation

    Correct: +2

    The charge of the calcium ion (Ca) is +2.

  10. 10. Which metal is commonly known to rust during corrosion?

    • Iron
    • Copper
    • Aluminum
    • Zinc
    Answer & explanation

    Correct: Iron

    The most familiar example of corrosion is the formation of rust on iron.

  11. 11. In the reaction 2Na + Cl2 -> 2NaCl, which substance is the reducing agent?

    • Cl2
    • NaCl
    • Na
    • None of the above
    Answer & explanation

    Correct: Na

    Sodium (Na) is oxidized in this reaction, making it the reducing agent.

  12. 12. In the reaction Fe2O3 + 3CO -> 2Fe + 3CO2, which substance is losing oxygen?

    • Fe2O3
    • CO
    • Fe
    • CO2
    Answer & explanation

    Correct: Fe2O3

    Fe2O3 is losing oxygen and undergoing reduction in the reaction.

  13. 13. What is the oxidation state of free elements?

    • -1
    • 0
    • +1
    • +2
    Answer & explanation

    Correct: 0

    The oxidation state of any uncombined or free element is 0 (zero).

  14. 14. How many chloride ions are needed for one calcium ion in calcium chloride?

    • 1
    • 2
    • 3
    • 4
    Answer & explanation

    Correct: 2

    Two chloride ions are needed for every calcium ion to balance the charges.

  15. 15. Which two components are needed for iron to rust?

    • Oxygen and water
    • Heat and air
    • Salt and air
    • Heat and moisture
    Answer & explanation

    Correct: Oxygen and water

    Oxygen and water are necessary for iron to rust.

  16. 16. What color change indicates the presence of reducing agents when using potassium permanganate?

    • From purple to red
    • From colorless to purple
    • From purple to colorless
    • From green to yellow
    Answer & explanation

    Correct: From purple to colorless

    The addition of acidified KMnO4 changes from purple to colorless when a reducing agent is present.

  17. 17. What occurs simultaneously in a redox reaction?

    • Oxidation and sublimation
    • Reduction and evaporation
    • Oxidation and reduction
    • Combustion and condensation
    Answer & explanation

    Correct: Oxidation and reduction

    In redox reactions, oxidation and reduction occur simultaneously.

  18. 18. In monoatomic ions, the oxidation state is equal to what?

    • The total number of atoms
    • The charge of the ion
    • Zero
    • The sum of all oxidation numbers
    Answer & explanation

    Correct: The charge of the ion

    In monoatomic ions, the oxidation state is the same as their charge.

  19. 19. Which of the following is the correct formula for magnesium oxide?

    • Mg2O2
    • MgO
    • MgO2
    • Mg2O
    Answer & explanation

    Correct: MgO

    The correct formula for magnesium oxide is MgO, with one magnesium ion and one oxide ion.

  20. 20. In the corrosion process, which part of the metal surface acts as an anode?

    • Region with relatively less moisture
    • Region with relatively more moisture
    • Region with no moisture
    • Entire metal surface
    Answer & explanation

    Correct: Region with relatively less moisture

    A region of metal surface that has relatively less moisture acts as anode.

  21. 21. What role does carbon monoxide (CO) play in the reaction Fe2O3 + 3CO -> 2Fe + 3CO2?

    • It is an oxidizing agent
    • It is a reducing agent
    • It does not change
    • It gains electrons
    Answer & explanation

    Correct: It is a reducing agent

    In the reaction, carbon monoxide (CO) is oxidized, acting as the reducing agent.

  22. 22. In the reaction 2C2H2 + 5O2 -> 4CO2 + 2H2O, which substance is losing hydrogen?

    • O2
    • C2H2
    • CO2
    • H2O
    Answer & explanation

    Correct: C2H2

    C2H2 is losing hydrogen and is undergoing oxidation in the reaction.

  23. 23. What is the sum of oxidation states in a neutral compound?

    • +1
    • -2
    • +2
    • 0
    Answer & explanation

    Correct: 0

    The oxidation state of a neutral compound is zero, meaning the sum of oxidation numbers of all atoms in a compound is zero.

  24. 24. What is the charge on the sulfate ion in aluminum sulfate?

    • +2
    • +3
    • -2
    • -3
    Answer & explanation

    Correct: -2

    The charge on the sulfate ion (SO4) is -2.

  25. 25. What is the reaction of Fe(s) in the anodic region of corrosion?

    • Fe(s) -> Fe2+(aq) + 2e-
    • Fe2+(aq) + O2 -> Fe2O3
    • O2 + H2O + e- -> OH-
    • Fe + H2O -> FeO
    Answer & explanation

    Correct: Fe(s) -> Fe2+(aq) + 2e-

    The reaction in the anodic region is Fe(s) -> Fe2+(aq) + 2e-.

FAQs

Are these Class 9 Chemistry MCQs Electrochemistry aligned with FBISE?

Yes. The MCQs are organized chapter-wise for FBISE and designed to match board exam patterns. If your teacher has added custom MCQs, they will also appear here.

How many MCQs should I practice from “Electrochemistry” each day?

A good daily target is 20–40 MCQs with full review of mistakes. If you’re short on time, do 15 MCQs but read explanations carefully.

What’s the best way to revise this chapter before an exam?

Revise the chapter summary, list your weak sub-topics, then practice MCQs in timed sets. Re-attempt wrong questions after a short break to lock in learning.

Can I take an online test for this chapter?

Yes. Start a chapter quiz to simulate an online test. Use it to improve speed and accuracy under time pressure.

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