Electrochemistry Numericals Most Asked in Board Exams: 2026 Guide
- Swarangi Nawge
- Jan 16
- 2 min read
Exam Overview
Exam Aspect | Details |
Chapter Weightage | 9–11 Marks |
Difficulty Level | Moderate to High |
Numerical Weightage | 60% of Chapter Marks |
Focus Areas | Nernst Equation, Kohlrausch’s Law, Faraday’s Laws |
Important Formulas for Electrochemistry Numericals
Following are the “Golden Formulas” you must memorize for 2026 board exams.
1. Electrochemical Cells
Standard Cell Potential:
E°cell = E°cathode − E°anode
Nernst Equation (at 298 K):
Ecell = E°cell − (0.0591 / n) log ([Anode] / [Cathode])
Gibbs Free Energy Change:
ΔG° = −nF E°cell
2. Electrolytic Conductance
Molar Conductivity:
Λm = (κ × 1000) / M
Degree of Dissociation (α):
α = Λm / Λ°m
Kohlrausch’s Law:
Λ°m (AxBy) = x λ°(A⁺) + y λ°(B⁻)
3. Faraday’s Laws of Electrolysis
Mass of Substance Deposited (w):
w = (E × I × t) / 96500
Where:
E = Equivalent weight
I = Current (in amperes)
t = Time (in seconds)
Electrochemistry Numericals Most Asked in Board Exams: Top 3 Types
Based on an analysis of previous year papers (2015–2025), these three numerical types appear in almost 90% of board exam sets.
Type 1: Calculating Cell EMF (3–5 Marks)
Problem:Calculate the EMF of the cell:Zn | Zn²⁺ (0.1 M) || Cu²⁺ (0.01 M) | Cu
Tip: Always check whether the given values are reduction potentials.If E°(Zn / Zn²⁺) is given (oxidation), reverse the sign to convert it intoE°(Zn²⁺ / Zn).
Type 2: Kohlrausch’s Law & Degree of Dissociation (2–3 Marks)
2026 Trend:Questions increasingly focus on calculating the dissociation constant (Ka) of weak electrolytes such as acetic acid.
Type 3: Resistance and Conductivity (2 Marks)
Question Style:Finding the cell constant (G*) when resistance (R) and conductivity (κ) are given.
Formula:
G* = κ × R
Medical Significance of Electrochemistry (2026 Context)
In modern medical diagnostics, electrochemical principles are used in:
Glucometers:Redox reactions help measure blood glucose levels accurately.
Pacemakers:Lithium–iodine batteries provide long-lasting electrochemical energy to regulate heartbeats.
Ion Channels:Understanding the Nernst potential is essential for studying nerve impulse transmission in the human body.
FAQ: Electrochemistry Numericals Most Asked in Board Exams
Q1. Which is the most repeated numerical type in Electrochemistry Numericals Most Asked in Board Exams?
Answer:Nernst Equation–based cell EMF calculations are the most repeated numericals, appearing in almost every board paper over the last decade.
Q2. How do I calculate the value of ‘n’ in the Nernst Equation?
Answer:‘n’ represents the number of electrons transferred in the balanced redox reaction.
Example (Cu–Ag Cell):Cu → Cu²⁺ + 2e⁻2Ag⁺ + 2e⁻ → 2Ag
Here, n = 2
Q3. Are units important in Electrochemistry numericals?
Answer:Yes. Many students lose marks by:
Not converting time into seconds in Faraday’s laws
Using S/m instead of S/cm in conductivity calculations
Conclusion
Mastering Electrochemistry Numericals Most Asked in Board Exams requires a clear understanding of the Nernst Equation, Kohlrausch’s Law, and Faraday’s Laws. By focusing on the 2026 exam pattern, which blends numerical chemistry with medical applications, students can confidently secure full marks in this high-weightage chapter.
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