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PYQs/Chemistry/Entropy

Chemistry2019easy

Entropy

In which case change in entropy is negative?

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Entropy

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In which of the following processes entropy increases? A. A liquid evaporates to vapour. B. Temperature of a crystalline solid lowered from 130 K to 0 K C. 2 $NaHCO_3$ (s) → $Na_{2}CO_3$ (s) + $CO_2$ (g) + $H_{2}O$ (g) D. $Cl_2$ (g) → 2Cl(g) Choose the correct answer from the options given below:

For a sample of perfect gas when its pressure is changed isothermally from $p_i$ to $p_f$ , the entropy change is given by

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