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Per NCERT Problem 5.10, in which of the following processes does entropy DECREASE?
ACrystalline solid heated from 0 K to 115 K
BH₂(g) → 2 H(g)
CA liquid crystallises into a solid (ordered, low-entropy state)
DDecomposition 2 NaHCO₃(s) → Na₂CO₃(s) + CO₂(g) + H₂O(g)
Answer & Solution
Correct answer: C. A liquid crystallises into a solid (ordered, low-entropy state)
Per NCERT Problem 5.10(i), liquid → solid: more ordered ⇒ ΔS decreases. The others increase entropy (heating, gas creation, dissociation).
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