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Foundation3 past questions

Gibbs Free Energy and Equilibrium

Explore the relationship between standard Gibbs free energy change (ΔG°) and the equilibrium constant (K), and how spontaneity is determined.

Why this shows up in the exam

You need to relate thermodynamic quantities to equilibrium for conceptual and calculation-based questions.

How NEET tests this

Direct recall · 2 QsNumericalMatch the columns

Practise it

These are real questions from past NEET papers that test this exact idea.

Question 1 of 3NEET 2023

The equilibrium concentrations of the species in the reaction A + B ⇌ C + D are 2, 3, 10 and 6 mol L⁻¹, respectively at 300 K. ΔG° for the reaction is (R = 2 cal/mol K)

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More challenging

1 harder question built from the past papers above — a step up in difficulty, with distractors designed so you can't get there by elimination. Written and checked by our reviewers, not from a real paper.

Question 1 of 1

At 298 K, a reaction P(g) ⇌ Q(g) + R(g) has equilibrium partial pressures of P, Q, and R as 0.1 atm, 0.5 atm, and 0.2 atm respectively. Calculate the standard Gibbs free energy change (ΔG°) for this reaction. (Given R = 8.314 J mol⁻¹ K⁻¹)

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