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Electrochemistry

CBSE · Class 12 · Chemistry

Complete topic list for Electrochemistry in CBSE Class 12 Chemistry. Key concepts, sub-topics, and what to focus on for board exams.

91 questions88 flashcards5 concepts

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A labeled diagram of the Standard Hydrogen Electrode (SHE), illustrating its components: a platinum electrode, 1 M H+ solution, and hydrogen gas at 1 bar pressure, and how it acts as a reference elect
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4 Topics · CBSE Class 12 Chemistry

Topics in Electrochemistry

1

1. Electrochemical Cells and Electrode Potentials

  • A Daniell cell converts the chemical energy of the redox reaction Zn(s) + Cu2+(aq) -> Zn2+(aq) + Cu(s) into electrical energy.
  • A Daniell cell is a galvanic or voltaic cell.
  • In a galvanic cell, oxidation takes place at the anode and reduction takes place at the cathode.
2

2. Nernst Equation, Equilibrium Constant, and Gibbs Energy

  • The Nernst equation gives electrode potential or cell potential under non-standard conditions.
  • For a Daniell cell, E_cell increases with increase in [Cu2+] and decreases with increase in [Zn2+].
  • At equilibrium, cell potential becomes zero.
3

3. Conductance, Resistivity, Conductivity, and Molar Conductivity

  • Resistance depends on the dimensions of a conductor or solution column.
  • Resistivity is a material property and is the resistance of a substance of unit length and unit area of cross section.
  • Conductance is the reciprocal of resistance.
4

4. Kohlrausch Law and Weak Electrolytes

  • Kohlrausch law states that the limiting molar conductivity of an electrolyte is the sum of the individual ionic contributions.
  • This law helps find limiting molar conductivity of weak electrolytes.
  • For weak electrolytes, Λm cannot be obtained by extrapolation to zero concentration.

Key Concepts

Central concept: Electrochemistry

Electrochemical cellsNernst equation and thermodynamicsConductance of electrolytic solutionsVariation of conductivity with concentrationKohlrausch lawElectrolysisBatteriesCorrosion

Frequently Asked Questions

What are the important topics in Electrochemistry for CBSE Class 12 Chemistry?
Key topics in Electrochemistry include Galvanic vs Electrolytic Cell: Correct Electrode Polarity and Ion/Electron Flow, Electrochemistry - Complete Chapter Mind Map, Electrochemistry — Chapter Overview. These are the concepts CBSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Electrochemistry — CBSE Class 12 Chemistry?
Understand the core concepts first, then work through the 91 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All 10 chapters — CBSE Class 12 Chemistry Syllabus

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