Entropy is a very important thermodynamic property. Change in entropy is positive in the following process

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Condensation of water

Formation of acetylene from its constituent elements

Contraction of gas at constant temperature

Decomposition of potassium chlorate

answer is D.

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Detailed Solution

1.H2Og→H2Ol; ΔS=−ve2. 2Cs+H2g → C2H2g ; ΔS = 03. Contraction of gas at const. T, volume ↓ ΔS = −ve4. 2KClO3s → 2KCls+3O2g; ΔS = +ve

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