Class 12 Electrochemistry Practice Exam: Nernst Calculator, Logic Lab & Board Simulator
Electrochemistry links spontaneous chemical reactions to electrical output. This Unit 2 guide moves beyond static notes, offering a hands-on learning dashboard. Students can gauge their readiness with a timed board-exam simulator, solve numericals instantly using dedicated calculators, and predict electrolysis products through logic trees. Whether reviewing the Nernst equation or comparing commercial batteries, these tools support practical understanding and exam performance.
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Class 12 • Electrochemistry
Ready to test your
Electrochemistry concepts?
Time Limit
25 Minutes
Questions
25 MCQs
Target
Board Level
Student Candidate
ID: 2026-CHEM-XII
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Detailed Solutions
Battery Technology Hub
Dry Cell
Primary- Anode: Zinc Cup
- Cathode: Graphite Rod
- Electrolyte: NH₄Cl + ZnCl₂ paste
- Volt: ~1.5 V
Mercury Cell
Primary- Anode: Zn-Hg Amalgam
- Cathode: HgO + Carbon
- Volt: 1.35 V (Constant)
- Use: Watches, Hearing aids
Lead Storage
Secondary- Anode: Spongy Lead (Pb)
- Cathode: PbO₂ Grid
- Electrolyte: 38% H₂SO₄
- Recharge: PbSO₄ dissolves back
H₂-O₂ Fuel Cell
Efficiency- Anode: H₂ fed (Oxidation)
- Cathode: O₂ fed (Reduction)
- Byproduct: Pure Water
- Efficiency: η = ΔG/ΔH (~70%)
Conductivity Measurement
To find conductivity (κ), we first measure Resistance (R) using a Wheatstone Bridge with AC current (to prevent electrolysis).
(Rx)
Electrolysis Logic Lab
Predict the anode product using step-by-step reasoning.
Λm vs √C Trends
Nernst Calc
Kohlrausch Calc (Λ°m)
Can We Store It?
Check if a solution can be kept in a metal container.
Faraday’s 2nd Law: Series Connection
Charge (Q) is same for all.
Mass ∝ Equivalent Weight
m₁/m₂ = E₁/E₂
Corrosion Prevention Strategies
Sacrificial Protection
Coating with a more reactive metal (e.g., Zinc on Iron). Zinc oxidizes (E° = -0.76V) instead of Iron (-0.44V). This is Galvanization.
Cathodic Protection
Connecting iron pipes to Mg or Zn blocks. The pipe becomes the cathode (protected) and the block becomes the anode (sacrificed).
