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🔥 Master Thermodynamics
NCERT Class 11 · Chapter 6

Real PYQs from top competitive exams — filter by exam, attempt each question, track your progress and submit to see your full score report.

Attempt PYQs Study Strategy
EnthalpyHess's LawEntropyGibbs ΔGBond Enthalpy
ΔG = ΔH – TΔS
12
Real PYQs
5
Exam Bodies
15+
Years Covered
~13%
Exam Weightage
PYQs Overview
🔥
First Law & Enthalpy
ΔU=q+w, ΔH=ΔU+ΔngRT, enthalpy of reactions.
★★★★★
82% Frequency
📊
Hess's Law
Enthalpy is a state function; use cycles for indirect ΔH calculations.
★★★★★
90% Frequency
🌀
Entropy & Second Law
Spontaneity, ΔS>0 for universe, disorder interpretation.
★★★★★
87% Frequency
⚡
Gibbs Free Energy
ΔG=ΔH–TΔS; ΔG<0 spontaneous, equilibrium when ΔG=0.
★★★★★
94% Frequency
🔗
Bond Enthalpy
ΔH_rxn = Σ(bonds broken) – Σ(bonds formed).
★★★★☆
74% Frequency
🌡️
Cp – Cv = R
Temperature dependence of ΔH via Kirchhoff's law.
★★★☆☆
45% Frequency
Topic Frequency
Gibbs Free Energy (ΔG) 94%
Hess's Law Applications 90%
Entropy & Spontaneity 87%
First Law / ΔH Calculations 82%
Bond Enthalpy 74%
Cp–Cv=R 60%
Kirchhoff's Law 45%
💡 Did You Know?
  • ΔG=ΔH–TΔS asked in every competitive exam
  • Hess's law numerical — 12× in JEE since 2005
  • Spontaneity from ΔG — zero skips in 15 yrs
  • Bond enthalpy MCQs — 8× in NEET since 2010
  • Chapter 6 = highest marks density
Key Takeaways
🔑
ΔG=ΔH–TΔS determines spontaneity
ΔG<0 spontaneous; ΔG>0 non-spontaneous; ΔG=0 equilibrium.
⚡
Hess's Law: ΔH is path-independent
Add/reverse/scale equations and their ΔH values accordingly.
📐
ΔH=ΔU+ΔngRT for gaseous reactions
Δng = gaseous products − gaseous reactants (moles).
🌊
Entropy increases with T, V, complexity
More microstates → higher entropy. S=k ln W.
🧮
Bond enthalpy: broken − formed
Energy to break bonds minus energy released forming bonds.
🎯
Cp–Cv=R for ideal monoatomic gas
Cp=5/2 R, Cv=3/2 R for monoatomic.
Study Strategy
1
Laws & DefinitionsDay 1–2
System, surroundings, state functions, path functions. First & Second Laws.
2
Enthalpy CalculationsDay 3
Hess's law cycles, formation, combustion, bond enthalpies.
3
Entropy & GibbsDay 4–5
ΔS signs, spontaneity table (ΔH/ΔS combos), ΔG numericals.
4
Attempt All PYQsDay 6–7
Hess's Law and ΔG questions are most common — do them all.
5
Mock & RevisionDay 8
30-Q timed; target all four ΔH/ΔS spontaneity combinations.
🗓️ 8-Day Chapter Plan
Day 1–2 Laws & Definitions
Day 3 Enthalpy Calculations
Day 4–5 Entropy & Gibbs
Day 6–7 Attempt All PYQs
Day 8 Mock & Revision
🧠 Pro Tip: The four ΔH/ΔS combinations for ΔG appear every year. Know when each case is spontaneous at all temperatures.
🚀

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Real PYQs, topic-wise overview, key takeaways and an 8-day strategy — all in one place.

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ACADEMIA AETERNUM तमसो मा ज्योतिर्गमय · Est. 2025
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Thermodynamics | Chemistry Class -11
Thermodynamics | Chemistry Class -11 — Complete Notes & Solutions · academia-aeternum.com
🎓 Class -11 📐 Chemistry 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
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