Chemical Thermodynamics – Entropy, Gibbs Free Energy, Spontaneity
Chemistry · Grade 11 · Week 17 · 25 questions
Chemical Thermodynamics is a core Grade 11 chemistry chapter covering Entropy, Gibbs Free Energy, and Spontaneity. Clear understanding here pays off in competitive exams (JEE/NEET) where speed matters.
What you'll practise
- Calculate Entropy
- Calculate Gibbs Free Energy
- Predict Spontaneity
- Apply chemical thermodynamics concepts to NCERT exercise and exemplar problems
All 25 questions in this Chemical Thermodynamics – Entropy, Gibbs Free Energy, Spontaneity quiz
Grade 11 Chemistry — Chemical Thermodynamics – Entropy, Gibbs Free Energy, Spontaneity: 25 practice questions with instant scoring and explanations.
- Entropy S is a measure of:
- Units of entropy:
- Second law of thermodynamics:
- For reversible process: ΔS_sys =
- ΔS for gas → liquid is:
- ΔS for solid → gas is:
- Entropy increases in which direction:
- Third law of thermodynamics:
- Gibbs free energy G =
- For spontaneous process:
- At equilibrium:
- ΔG = ΔH − TΔS. For ΔH < 0, ΔS > 0:
- ΔH > 0, ΔS < 0: Reaction is:
- ΔH < 0, ΔS < 0: Spontaneous at:
- ΔH > 0, ΔS > 0: Spontaneous at:
- ΔG° =
- When K > 1, ΔG° is:
- When K < 1, ΔG° is:
- Enthalpy-driven reactions have:
- Entropy-driven reactions have:
- ΔS universe = ΔS system +
- ΔS_surr =
- For 2H₂ + O₂ → 2H₂O(g), ΔS_sys is:
- The entropy of universe is:
- Standard Gibbs energy of formation of elements:
Question 1 of 250 correct so far