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How does entropy change in the following processes? Explain. (a) freezing of a liquid (b) sublimation of a solid (c) dissolving sugar in water (d) condensation of vapour. |
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Answer» Solution :(a) Freezingof a liquid resultin decrease in randomness anddiorder , hencedecrease, `DELTAS gt 0`. (b) Sublimation of a solid CONVERTS it into VAPOUR where uhemolecules or atoms are free to move randomly. Hence DISORDER increases ACCOMPANYING increase in entropy, `DeltaS gt 0` (c) Dissolving sugar in water separates the molecules of sugar in the solution increasing disorder and entropy, `DeltaS gt 0` (d) Condensation of vapour decreases the disorder and randomness, hence entropy, `DeltaS gt 0` . |
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