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Class XII · Chemistry

Electrochemistry: NEET MCQ practice

309 practice questions on Electrochemistry, each with an explanation. Practise them chapter by chapter in the GyaanLoop app.

309

Practice questions

116

Easy

162

Medium

31

Hard

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What Electrochemistry covers

Topics in the NEET (UG) 2026–27 syllabus for this chapter.

  • Electrolytic and metallic conduction, conductance in electrolytic solutions, Kohlrausch's law
  • Electrochemical cells- electrolytic and galvanic cells, electrode potentials, standard electrode potential
  • Half-cell and cell reactions, emf of a galvanic cell and its measurement
  • Nernst equation and its applications
  • Relationship between cell potential and Gibbs' energy change
  • Dry cell and lead accumulator, fuel cells

Sample questions on Electrochemistry

Try each one, then open the answer and explanation.

Question 1 · Practice question

In corrosion of iron

  1. A.an electrochemical (galvanic cell) is formed in which Fe acts as anode and where O₂ is reduced, is the cathode
  2. B.electrons flow from anode to cathode through the metal while ions flow through the water droplets
  3. C.dissolved O₂ oxidises Fe 2+ to Fe 3+ before it is deposited as rust (Fe₂O₃ .H₂O)
  4. D.All the above are observed
Show answer

Answer: D. All the above are observed

During rusting, iron acts as anode (oxidation), oxygen reduction occurs at cathode, forming an electrochemical cell (a). Electrons move through iron while ions move through water (b). Fe²⁺ is oxidised by O₂ to Fe³⁺, eventually forming rust Fe₂O₃·H₂O (c). All three are correct steps in corrosion, so (d) is true.

Question 2 · Practice question

"Maintenance-free" batteries now in use in place of commom batteries ,have

  1. A.electrodes made of lead-lead oxide
  2. B.electrodes made of calcium-containing lead alloy
  3. C.non-aqueous solvents as medium
  4. D.platinum electrodes
Show answer

Answer: B. electrodes made of calcium-containing lead alloy

Maintenance-free lead-acid batteries use calcium alloy with lead instead of antimony to reduce water loss through gassing, making them sealed. Option (a) describes the basic electrode materials of any lead-acid battery, not the maintenance-free feature, while options (c) and (d) are not characteristics of commercial maintenance-free automotive batteries.

Question 3 · Practice question

In the following batteries, alkaline electrolytes are used I. Mercury II. Nickel-cadmium III. Modified Leclanche cell Cell potential is found to be independent of [OH - ] in

  1. A.I, II, III
  2. B.I ,II
  3. C.II, III
  4. D.Only III
Show answer

Answer: A. I, II, III

In both mercury (Zn-HgO) and nickel-cadmium (Ni-Cd) cells, the hydroxide ions produced in one half-cell are consumed in the other, so they cancel out and the cell potential doesn't depend on [OH⁻]. The modified Leclanche cell (alkaline version) also follows the same principle: OH⁻ appears on both sides of the net reaction. That makes the equilibrium constant independent of [OH⁻], and thus the Nernst equation shows no [OH⁻] term. The tempting wrong option might exclude the modified Leclanche if one mistakenly thinks its potential depends on pH, but in its alkaline form it's similar to the others.

Question 4 · Practice question

Following are certain facts about batteries. I. They are classified as primary, secondary and flow batteries. II. Leclanche cell is a primary battery. III. Lead-acid (storage) battery is a secondary cell. Select the correct facts.

  1. A.I, II
  2. B.I, III
  3. C.II, III
  4. D.I, II, III
Show answer

Answer: D. I, II, III

All three statements are standard textbook facts: batteries are indeed classified as primary, secondary, and flow batteries; the Leclanche cell (common dry cell) is non‑rechargeable (primary); and the lead‑acid battery is rechargeable (secondary). There is no trap—each statement is independently true, so option D is correct.

Question 5 · Practice question

In which of the following,reactants are not contained with the cell but are continuously supplied from the external source?

  1. A.Lithium battery
  2. B.Fuel cell
  3. C.Dry cell
  4. D.Lead-storage battery
Show answer

Answer: B. Fuel cell

The correct answer is fuel cell because it operates by continuously supplying fuel (like hydrogen and oxygen) from outside, unlike batteries where all reactants are self-contained. Dry cell, lithium battery, and lead-storage battery all contain their reactants internally and are not refueled during operation.

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