Electrochemistry CBSE Class 12 PYQ Chapter Wise (2016–2026)

Explore: All CBSE Class 12 chapters · CBSE Class 12 Chemistry PYQs · CBSE Class 12 hub · Syllabus & pattern · Class 12 2026

Answer first

Electrochemistry PYQs (previous year questions) for CBSE Class 12: Electrochemistry (Chemistry) had 22 questions across the 50 official CBSE Class 12 papers we tagged (2016–2026), and appeared in 10 of them. Asked in 10 of 10 years. The concepts asked in the most papers: Nernst Equation, Gibbs Energy and Cell EMF, Kohlrausch Law.

Year-wise question count

Asked in 10 of 10 years.

Most-asked concepts

Sorted by the number of papers a concept appeared in.

How to practise Electrochemistry PYQs

1. Start with the concepts at the top of the table. They have come back the most.
2. Solve one year’s Electrochemistry questions from the official PDF against the clock, then check the answer listed below.
3. Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
4. Once a concept is clean in two papers, move to the next. Then sit a full paper from the year pages.

Questions by year

Each line gives the question number and paper, type, concept, our one-line summary, with a link to the official PDF.

CBSE Class 122026

• Q.5 (Chemistry (56/1/1)) · MCQ · Electrolysis: Products of electrolysing aqueous CuCl2 with Pt electrodes PDF
• Q.23 (Chemistry (56/1/1)) · Short answer · Electrochemical Cells: Kc and standard Ecell, H2 liberation by metals, lead battery charging PDF
• Q.33 (Chemistry (56/1/1)) · Long answer · Nernst Equation: Emf and delta G of a Mg/Ag cell at 298 K PDF

CBSE Class 122025

• Q.2 (Chemistry (56/1/1)) · MCQ · Standard Electrode Potential: Cell potential from Sn4+/Sn2+ and Cr3+/Cr couples PDF
• Q.23 (Chemistry (56/1/1)) · Short answer · Kohlrausch Law: State Kohlrausch and Faraday laws; choose metal to protect iron PDF
• Q.31 (Chemistry (56/1/1)) · Long answer · Nernst Equation: Emf of Sn/H2 cell; Cl2 at anode in brine; conductivity on dilution PDF

CBSE Class 122024

• Q.17 (Chemistry (56/1/1)) · Very short answer · Nernst Equation: Electrode potential of iron at 0.01 M Fe2+ PDF
• Q.22 (Chemistry (56/1/1)) · Short answer · Conductivity: Conductivity and molar conductivity of AgNO3 using a KCl-calibrated cell PDF
• Q.29 (Chemistry (56/1/1)) · Case-based · Batteries: Passage on batteries: primary vs secondary, mercury cell, lead storage PDF

CBSE Class 122023

• Q.3 (Chemistry (56/1/1)) · MCQ · Cell Representation: Correct cell notation for Zn reducing Ag+ PDF
• Q.4 (Chemistry (56/1/1)) · MCQ · Gibbs Energy and Cell EMF: Signs of delta G and Ecell for a spontaneous reaction PDF
• Q.20 (Chemistry (56/1/1)) · Very short answer · Molar Conductivity: Identify strong electrolyte from dilution data with a graph PDF
• Q.33 (Chemistry (56/1/1)) · Long answer · Kohlrausch Law: Kohlrausch law for acetic acid; max work and log Kc for Ni/Ag cell PDF

CBSE Class 122022

• Q.3 (Chemistry (56/1/1)) · Very short answer · Nernst Equation: Nernst equation for Daniell cell; effect of changing ion concentrations PDF
• Q.11 (Chemistry (56/1/1)) · Short answer · Gibbs Energy and Cell EMF: E standard from Gibbs energy; limiting molar conductivity of MgCl2 PDF

CBSE Class 122020

• Q.7 (Chemistry (56/1/1)) · Very short answer · Corrosion: Whether zinc or tin coating better protects iron PDF
• Q.35 (Chemistry (56/1/1)) · Long answer · Gibbs Energy and Cell EMF: Delta G for Daniell cell reaction; advantages of fuel cells PDF

CBSE Class 122019

• Q.25 (Chemistry (56/1/1)) · Long answer · Nernst Equation: Ecell of Mg/Cu cell and current direction under external potential PDF

CBSE Class 122018

• Q.25 (Chemistry (56/1)) · Long answer · Nernst Equation: Cell reaction and emf of Sn/H2 cell; reasons on electrolysis and conductivity PDF

CBSE Class 122017

• Q.9 (Chemistry (56/1)) · Short answer · Batteries: Name hearing-aid cell and its electrode reactions PDF
• Q.12 (Chemistry (56/1)) · Short answer · Gibbs Energy and Cell EMF: Standard Gibbs energy from Ecell; electrons flowing for given current and time PDF

CBSE Class 122016

• Q.24 (Chemistry (56/1/N)) · Long answer · Nernst Equation: E standard of Cr/Fe cell from Ecell; choose metal to protect iron from rust PDF

Other Chemistry chapters

• The Solid State PYQs
• Solutions PYQs
• Chemical Kinetics PYQs
• Surface Chemistry PYQs
• General Principles of Isolation of Elements PYQs
• The p-Block Elements PYQs
• The d- and f-Block Elements PYQs
• Coordination Compounds PYQs
• Haloalkanes and Haloarenes PYQs
• Alcohols, Phenols and Ethers PYQs
• Aldehydes, Ketones and Carboxylic Acids PYQs
• Amines PYQs
• Biomolecules PYQs
• Polymers PYQs
• Chemistry in Everyday Life PYQs

FAQ

How many Electrochemistry questions come in CBSE Class 12?

In the official papers we tagged: 3 in 2026, 3 in 2025, 3 in 2024, 4 in 2023, 2 in 2022, 2 in 2020, 1 in 2019, 1 in 2018, 2 in 2017 and 1 in 2016. That is 22 questions in all, about 8% of Chemistry.

Which Electrochemistry topics repeat in CBSE Class 12?

Asked in the most papers: Nernst Equation, Gibbs Energy and Cell EMF, Kohlrausch Law. The concept table lists every one with its count.

Are these official CBSE Class 12 questions?

Yes. Every question is from an official CBSE Class 12 paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.