JEE Thermodynamics Quiz
Practice on the laws of thermodynamics, enthalpy and Hess's law, entropy, and Gibbs free energy and spontaneity - with the sign conventions applied explicitly.
Skill map
Levels in this jee thermodynamics quiz
Every question is generated fresh by AI and calibrated to your level - clear a level and the next one gets harder. Miss one and the AI tutor explains Chemical Thermodynamics until it sticks, then aims a follow-up at the gap. Want to grind one level? Start the quiz and type that sub-topic as your own.
Exam focus
How Chemical Thermodynamics is asked
Reliably represented, and unusual in that a majority of its errors are sign errors rather than conceptual gaps. Note that JEE tests chemical thermodynamics alongside thermodynamics in Physics with different sign conventions in some textbooks - fix one convention and stay with it.
Cheat sheet
Chemical Thermodynamics formulas worth memorising
| Quantity | Formula |
|---|---|
| First law | ΔU = q + w |
| Work of expansion | w = −P(ext)ΔV |
| Enthalpy | H = U + PV |
| Relation of ΔH and ΔU | ΔH = ΔU + Δn(g)RT |
| Gibbs free energy | ΔG = ΔH − TΔS |
| Free energy and equilibrium | ΔG° = −RT ln K |
| Entropy change (reversible) | ΔS = q(rev)/T |
Marks lost here
Common mistakes in Chemical Thermodynamics
- Getting the sign of work wrong. With ΔU = q + w, work done by the system is negative and work done on it is positive. Textbooks differ, so pick the convention in the equation you are using and apply it throughout.
- Equating spontaneous with fast. A negative ΔG means a process is thermodynamically feasible, not that it happens at an observable rate - the conversion of diamond to graphite is spontaneous and takes geological time.
- Using ΔH where ΔU is required. They differ by Δn(g)RT, so they are equal only when a reaction involves no change in the number of gas moles.
- Assuming entropy always increases. The second law requires the entropy of the universe to increase; a system's entropy can fall if the surroundings gain more, which is how freezing and crystallisation occur spontaneously.
- Using ΔG° in place of ΔG. The standard value fixes K, but the actual ΔG depends on the current reaction quotient and is zero at equilibrium.
Game rules
How a round works
- 01Spawn
Press play - the AI generates Chemical Thermodynamics questions in seconds.
- 02Level up
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- 03Learn or lose
Every answer - right or wrong - gets an AI tutor explanation. Wrong answers respawn as follow-ups.
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Player's guide
JEE Thermodynamics Quiz - FAQs
When is a reaction spontaneous?
When ΔG is negative. If ΔH is negative and ΔS positive it is spontaneous at all temperatures; if both are negative it is spontaneous only at low temperature; if both are positive, only at high temperature. If ΔH is positive and ΔS negative, never.
What does ΔG = 0 mean?
The system is at equilibrium - forward and reverse processes proceed at equal rates and there is no net drive in either direction. This is also the condition used to find the transition temperature for a phase change.
Is the jee thermodynamics quiz free?
Yes - completely free, with no sign-up required. Type a topic, press start, and the AI generates an adaptive Chemical Thermodynamics quiz with an explanation for every answer.
Can teachers host this jee thermodynamics quiz live for a class?
Yes - create a free teacher account, host a live room on "Chemical Thermodynamics", and students join with a 6-character code at quff.in/join. No student accounts needed.
From the blog
Chemical Thermodynamics guides & reading
JEE Chemical Thermodynamics: 30 Practice Questions Solved
Thirty solved Thermodynamics questions. Most errors here are sign errors, not conceptual gaps - so every solution writes the convention out.
Exam PrepJEE Mole Concept: 30 Practice Questions with Solutions
Thirty solved Mole Concept questions. Weakness here does not cost you one chapter - it costs you marks scattered across all of Physical Chemistry.
Exam PrepJEE Chemical Equilibrium: 30 Practice Questions Solved
Thirty solved Equilibrium questions across both halves of the chapter - gaseous and ionic - with the ionic half weighted as the exam weights it.
More exam prep quizzes
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Six adaptive Chemical Thermodynamics questions. About two minutes. Climb the podium.