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Chemical Equilibrium formula sheet

Every formula in the Chemical Equilibrium chapter for JEE Main, with one line on when it applies. Topic 1 is open to everyone; sign in free to read all 18 and download the PDF.

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How we count: 7× asked means 7 past JEE Main questions in the PrepWiser bank needed that formula, and "last" is the latest year one appeared. ★ marks formulas asked 8 or more times.

Dynamic and physical equilibrium

Dynamic equilibrium
5× asked, last 2025
rf=rb,Kc=kfkb  (one step)r_f=r_b,\qquad K_c=\frac{k_f}{k_b}\ \ (\text{one step})
Closed system, fixed TT. Amounts constant, not equal; reached from either side.
Physical equilibria
4× asked, last 2025
HX2O(s)⇌HX2O(l),HX2O(l)⇌HX2O(g)IX2(s)⇌IX2(g)\begin{aligned}&\ce{H2O(s) <=> H2O(l)},\qquad \ce{H2O(l) <=> H2O(g)}\\&\ce{I2(s) <=> I2(g)}\end{aligned}
Vapour pressure depends only on TT while liquid remains. Pressure lowers the m.p. of ice.

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Practise Chemical Equilibrium

16 more formulas in 4 topics

Law of mass action and K, Reaction quotient and calculations, Gibbs energy and temperature and Le Chatelier's principle. Read the first part free. Sign in free with Google to read the rest and download the PDF.

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Law of mass action and K

  • Law of mass action7×
  • Kp and Kc9×
  • Units of K2×
  • Heterogeneous equilibria5×
  • Manipulating K10×

Reaction quotient and calculations

  • Reaction quotient6×
  • Partial pressures12×
  • Degree of dissociation13×
  • HI dissociation
  • Small α\alpha, fractional coefficient5×

Gibbs energy and temperature

  • ΔG° and K13×
  • van 't Hoff equation2×

Le Chatelier's principle

  • Concentration change7×
  • Pressure or volume4×
  • Inert gas6×
  • Temperature3×

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Practise Chemical Equilibrium

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