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Punjab Board Class 12 Chemistry — Formula Sheet

Punjab Board Class 12 Chemistry formula sheet, chapter by chapter — 14 formulas across 3 chapters. Follows the PSEB syllabus.

How to Use the Formula Sheet

  1. Write, don't just read — writing each formula out helps it stick.
  2. Understand the derivation — you can rebuild a formula you half-remember.
  3. Group related formulas — link the ones that build on each other.
  4. Test yourself — cover the sheet and write the formulas from memory.

Chapter-Wise Formulas — 3 Chapters

1

Solutions

5 entries
p1 = p°1 × x1 and p2 = p°2 × x2.
Total pressure by Dalton's law: p_total = p1 + p2 = p°1×x1 + p°2×x2.
Henry's law states that the partial pressure of a gas above a solution is directly proportional to its mole fraction in the solution: p = KH × x.
Raoult's law states that the partial vapour pressure of each volatile component is directly proportional to its mole fraction: p₁ = p₁⁰ × x₁.
Ideal solutions obey Raoult's law completely and have ΔmixH = 0 and ΔmixV = 0.
The full Solutions formula sheet
2

Electrochemistry

6 entries
General Nernst equation for a cell: E_cell = E°_cell – (RT/nF) ln Q
Resistance (R) of a conductor: R = ρl/A (in ohms, Ω); where ρ = resistivity, l = length, A = cross-section area.
Conductance (G) = 1/R = κA/l. SI unit: Siemens (S) or Ω⁻¹.
STRONG ELECTROLYTES (e.g., NaCl, KCl, HCl): Λm increases SLOWLY with dilution. Debye-Hückel-Onsager equation: Λm = Λ°m – A√c (Debye-Hückel-Onsager or Kohlrausch equation).
Plot of Λm vs √c is a straight line for strong electrolytes. Intercept = Λ°m, Slope = –A.
The full Electrochemistry formula sheet
3

Chemical Kinetics

3 entries
Rate of disappearance of reactant R: rate = -Δ[R]/Δt (negative sign because concentration decreases)
Unimolecular: 1 species involved — e.g., NH₄NO₂ → N₂ + 2H₂O
Zero order integrated equation: [R] = [R]₀ - kt
The full Chemical Kinetics formula sheet

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Frequently Asked Questions

Where can I find Punjab Board Class 12 Chemistry Formula Sheet?

This page has formula sheet for 3 chapters of Punjab Board Class 12 Chemistry for the board exams 2027. Each chapter links to its own page with the full set.

Go through the syllabus first, then work chapter by chapter: learn the ideas, practise questions, and revise with notes and flashcards. Leave time at the end to revise every chapter once more under timed conditions.

Learn the formulas you use most first, and understand what each symbol means so you can apply them. Knowing where a formula comes from helps you rebuild it if you forget it in the exam.

Browse Formula Sheet by Chapter

3 chapters

1

Solutions

2

Electrochemistry

3

Chemical Kinetics

More Chemistry Resources

Punjab Board Class 12

Practice Quiz

Test yourself with quick quizzes

Important Questions

Exam-style questions with answers

Revision Notes

Key concepts and quick revision points

Chapter Summary

Understand each chapter at a glance

Concept Maps

Diagrams showing how topics connect

Flashcards

Quick-fire cards for active recall practice

Syllabus

Chapter list and the topics in each

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