Physics Wallah

Electrochemistry Important Questions for CBSE Boards 2026 Class 12

In Electrochemistry, students should focus on high-weightage areas such as the Nernst equation, standard electrode potentials, E°cell calculations, galvanic and electrolytic cells, conductivity vs. molar conductivity, and Kohlrausch’s Law. In the Central Board of Secondary Education exam, numerical and assertion–reasoning questions are very common. Strong formula revision and regular practice of EMF and conductivity problems are key to scoring full marks.
Electrochemistry Important Questions for CBSE Boards 2026 Class 12

Electrochemistry Important Questions for CBSE Boards 2026 Class 12 is a crucial topic that carries significant weight in the Central Board of Secondary Education examination, scheduled for February 28, 2026 (10:30 AM – 1:30 PM). This chapter focuses on the interconversion of chemical and electrical energy, covering key concepts such as the Nernst equation, standard electrode potentials, galvanic and electrolytic cells, conductivity, molar conductivity, and Kohlrausch’s Law. Since numerical problems and assertion–reason questions are frequently asked from this unit, a clear understanding of formulas, cell representation, and reaction feasibility is essential for scoring high marks in the 2026 board exams.

CBSE Class 12 Chemistry  Most Important Electrochemistry Questions

Below are the most important Electrochemistry questions specially selected to help students prepare effectively for the CBSE Class 12 board exam scheduled on 28 February 2026. These questions cover key topics such as Galvanic Cells, Nernst Equation, EMF Calculations, Conductivity, Molar Conductivity, Kohlrausch’s Law, and Electrochemical Series.

Practicing these important questions will help students strengthen their conceptual clarity, improve numerical solving skills, and understand important formulas and reactions. Regular practice will also boost confidence and help in scoring high marks in the final examination.

1. Electrochemistry (Very Important)

  • Write the Nernst Equation and explain each term.

  • Calculate EMF of a cell using given data.

  • Define standard electrode potential.

  • What is the function of a salt bridge?

  • Differentiate between galvanic cell and electrolytic cell.

2. Electrochemical Series

  • Which metal is the strongest reducing agent?

  • Predict whether a given reaction is feasible using E° values.

  • Arrange given metals in order of increasing reducing power.

3. Conductivity & Kohlrausch’s Law

  • State and explain Kohlrausch’s Law.

  • Why does molar conductivity increase on dilution?

  • Define limiting molar conductivity.

  • Compare conductivity and molar conductivity.

4. Chemical Kinetics

  • Define rate of reaction and rate constant.

  • Derive the expression for first-order reaction.

  • What is half-life of a first-order reaction?

  • Write units of rate constant for different orders.

5. Solutions

  • Define Raoult’s Law.

  • What are colligative properties?

  • Calculate molar mass using elevation in boiling point.

  • What is abnormal molar mass?

Electrochemistry Important Questions for CBSE Boards 2026 Class 12 FAQs

How do you determine if a metal is suitable for sacrificial protection?

A metal is suitable for sacrificial protection if it is more reactive than the metal it protects. This means it should have a lower (more negative) standard reduction potential (E°) than the protected metal.

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

The salt bridge serves two main purposes: to complete the internal electrical circuit by allowing ion migration between half-cells, and to maintain electrical neutrality within the solutions, preventing charge buildup.

What is the condition for a cell reaction to be considered feasible or spontaneous?

A cell reaction is considered feasible (spontaneous) if its calculated standard cell potential (E°cell) is positive (E°cell > 0).

When does an electrochemical cell start behaving like an electrolytic cell?

An electrochemical cell acts as an electrolytic cell when an external opposing potential (E_ext) is applied that is greater than the cell's standard potential (E°_cell). This reverses the reaction direction and electron flow, making the cell non-spontaneous.
Free Learning Resources
Know about Physics Wallah
Physics Wallah is an Indian edtech platform that provides accessible & comprehensive learning experiences to students from Class 6th to postgraduate level. We also provide extensive NCERT solutions, sample paper, NEET, JEE Mains, BITSAT previous year papers & more such resources to students. Physics Wallah also caters to over 3.5 million registered students and over 78 lakh+ Youtube subscribers with 4.8 rating on its app.
We Stand Out because
We provide students with intensive courses with India’s qualified & experienced faculties & mentors. PW strives to make the learning experience comprehensive and accessible for students of all sections of society. We believe in empowering every single student who couldn't dream of a good career in engineering and medical field earlier.
Our Key Focus Areas
Physics Wallah's main focus is to make the learning experience as economical as possible for all students. With our affordable courses like Lakshya, Udaan and Arjuna and many others, we have been able to provide a platform for lakhs of aspirants. From providing Chemistry, Maths, Physics formula to giving e-books of eminent authors like RD Sharma, RS Aggarwal and Lakhmir Singh, PW focuses on every single student's need for preparation.
What Makes Us Different
Physics Wallah strives to develop a comprehensive pedagogical structure for students, where they get a state-of-the-art learning experience with study material and resources. Apart from catering students preparing for JEE Mains and NEET, PW also provides study material for each state board like Uttar Pradesh, Bihar, and others

Copyright © 2026 Physicswallah Limited All rights reserved.