FSc Part 1 Chemistry chapter 10: Electrochemistry MCQs with answers

By Team Megalecture · Updated 4 Nov 2026

29 exam-style questions on Electrochemistry, each with the answer and a short explanation. Ten of them are below to try. The chapter test draws ten fresh questions each time and is marked the moment you finish, with your score by topic.

29 questions · 3 topics · 10 per test

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What chapter 10 covers

Ten Electrochemistry questions with answers

Try each one, then open the answer. These ten stay the same; the test draws new ones every time.

1. What is the oxidation number of chromium in K2Cr2O7?

  1. A
    +7
  2. B
    +3
  3. C
    +12
  4. D
    +6
Show answer

Answer: D. 2(+1) + 2x + 7(−2) = 0, so 2x = 12 and x = +6. +12 is the total for both Cr atoms.

2. What is the oxidation number of oxygen in hydrogen peroxide, H2O2?

  1. A
    −1
  2. B
    −2
  3. C
    +1
  4. D
    0
Show answer

Answer: A. 2(+1) + 2x = 0, so x = −1. Oxygen is −2 in most compounds but −1 in peroxides.

3. Lithium is at the top of the electrochemical series, with the most negative standard reduction potential. This means lithium is

  1. A
    the strongest oxidising agent
  2. B
    the least reactive metal
  3. C
    the strongest reducing agent
  4. D
    unable to lose electrons
Show answer

Answer: C. A very negative E° means Li loses electrons most readily, so Li is the strongest reducing agent. F2, at the bottom (+2.87 V), is the strongest oxidising agent.

4. In a hydrogen-oxygen fuel cell with KOH electrolyte, what is the only product of the cell reaction?

  1. A
    hydrogen peroxide
  2. B
    water
  3. C
    potassium hydroxide
  4. D
    carbon dioxide
Show answer

Answer: B. 2H2 + O2 → 2H2O. The fuels are fed in continuously and the KOH is not used up, which is why fuel cells are clean energy sources, e.g. in spacecraft.

5. In an electrolytic cell, the cathode is

  1. A
    the negative electrode, where reduction occurs
  2. B
    the positive electrode, where reduction occurs
  3. C
    the negative electrode, where oxidation occurs
  4. D
    the positive electrode, where oxidation occurs
Show answer

Answer: A. The cathode is connected to the negative terminal of the battery; cations take electrons from it and are reduced. Oxidation happens at the positive anode.

6. Aqueous copper(II) sulphate is electrolysed using copper electrodes. What happens?

  1. A
    copper is deposited at the anode and oxygen is given off at the cathode
  2. B
    oxygen is given off at the anode and the blue colour fades
  3. C
    copper is deposited on the cathode and the copper anode dissolves, so the concentration stays the same
  4. D
    hydrogen is given off at the cathode
Show answer

Answer: C. Cu2+ + 2e− → Cu at the cathode; Cu → Cu2+ + 2e− at the anode. Copper is transferred, so the solution's colour stays the same. With inert electrodes O2 would form instead.

7. What is the function of the salt bridge in a galvanic cell?

  1. A
    it supplies electrons to the cathode
  2. B
    it completes the circuit and keeps the two solutions electrically neutral
  3. C
    it allows the two solutions to mix completely
  4. D
    it acts as a catalyst for the cell reaction
Show answer

Answer: B. Ions move through the salt bridge (e.g. KCl in agar) to balance the charges produced at each electrode. Electrons flow through the external wire, not the bridge.

8. In which compound does hydrogen have an oxidation number of −1?

  1. A
    HCl
  2. B
    NaH
  3. C
    H2O
  4. D
    NH3
Show answer

Answer: B. In metal hydrides such as NaH, hydrogen is bonded to a less electronegative metal, so it is −1. In compounds with non-metals it is +1.

9. In the reaction Zn + Cu2+ → Zn2+ + Cu, which species is the oxidising agent?

  1. A
    Zn
  2. B
    Cu2+
  3. C
    Zn2+
  4. D
    Cu
Show answer

Answer: B. Cu2+ accepts electrons from zinc, so it is reduced and acts as the oxidising agent. Zn is the reducing agent.

10. A steel spoon is to be electroplated with silver. How is the cell set up?

  1. A
    spoon as anode, silver as cathode, silver nitrate solution
  2. B
    spoon as cathode, silver as anode, sodium nitrate solution
  3. C
    spoon and silver both as anodes
  4. D
    spoon as cathode, silver as anode, a solution of a silver salt
Show answer

Answer: D. Ag+ ions are reduced on the object at the cathode; the silver anode dissolves to replace them. The electrolyte must contain Ag+ ions.

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How many Electrochemistry MCQs are there?

29, each with the answer and a short explanation, across 3 topics: Oxidation numbers and balancing redox equations, Electrolysis and electrolytic cells, Galvanic cells, electrode potentials and batteries. Every chapter test draws ten of them, so you can take it many times.

Is the FSc Part 1 Chemistry chapter 10 test free?

Yes. The test, the answers and the explanations are free and need no sign-up. Sign in only if you want your scores kept across devices.

How is the chapter test marked?

The moment you press Finish: your score, the right answer and an explanation for every question, and the ones you got wrong saved in My mistakes to retry.

Can I read the explanations in Urdu?

Yes. In practice mode and on your results you can switch the explanations to Urdu.

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