Chapter 101 of 2363 min read

Entropy and Gibbs energy, spontaneity

Why this is asked: Spontaneity is decided by ΔG = ΔH − TΔS, never by ΔH or ΔS alone — an endothermic process (ΔH positive) can still be spontaneous if ΔS is large enough and T is high, which is exactly the case NEET uses to catch anyone pattern-matching "exothermic means spontaneous."

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Test yourself

•In which of the following processes does entropy increase? A. A liquid evaporates to vapour. B. The temperature of a crystalline solid is lowered from 130 K to 0 K. C. $2NaHC O_{3} (s) \to N a_{2} C O_{3} (s) + C O_{2} (g) + H_{2} O (g)$ D. $C l_{2} (g) \to 2Cl (g)$ Choose the correct answer from the options given below:

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