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Electrochemistry — NEET & JEE Chemistry MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

What energy conversion occurs in a galvanic cell?
  1. Chemical energy of a spontaneous reaction becomes electrical energy ✓
  2. Electrical energy drives a non-spontaneous chemical reaction
  3. Thermal energy alone becomes nuclear energy
  4. Mechanical energy separates an electrolyte into ions
Answer: A. A galvanic cell converts the Gibbs energy released by a spontaneous redox reaction into electrical work. The electrolytic-cell description is the closest reversed-process trap.
Why not B: That describes an electrolytic cell powered by an external source.
Why not C: No nuclear transformation is involved in an electrochemical cell.
Why not D: Ion separation is not the defining energy conversion of a galvanic cell.
For Zn|Zn2+||Cu2+|Cu, E°Cu2+/Cu = +0.34 V and E°Zn2+/Zn = -0.76 V. What is E°cell?
  1. -1.10 V
  2. -0.42 V
  3. +1.10 V ✓
  4. +0.42 V
Answer: C. E°cell = 0.34 − (−0.76) = +1.10 V. The −1.10 V trap reverses electrode order, while +0.42 V ignores the negative sign of zinc's reduction potential.
Why not A: This has the correct magnitude but reverses cathode-minus-anode.
Why not B: This adds the two signed reduction potentials instead of subtracting the anode value.
Why not D: This subtracts the magnitudes 0.76−0.34 rather than applying their signs.
For Zn + Cu2+ → Zn2+ + Cu at 298 K, E° = 1.10 V. What is E when [Zn2+] = 1.0 M and [Cu2+] = 0.010 M? Use 0.0591/n with n = 2.
  1. 1.041 V after subtracting 0.0591 V ✓
  2. 1.159 V after adding 0.0591 V
  3. 1.100 V because solids fix the emf
  4. 0.982 V after subtracting 0.118 V
Answer: A. Q = 1.0/0.010 = 100 and log Q = 2; E = 1.10 − (0.0591/2)(2) = 1.041 V. The 0.982 V trap forgets the two-electron denominator.
Why not B: Q = 100 is greater than one, so the Nernst correction lowers rather than raises E.
Why not C: Solid activities are fixed, but the two ion concentrations still affect emf.
Why not D: This omits division by n and subtracts the full 0.0591 log100 term.

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Other NEET Chemistry chapters

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Questions

How many NEET and JEE questions are there on Electrochemistry?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 12 chapter.

Is this NEET and JEE Chemistry chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.