Identify the correct statements from the following. I. At $0 \mathrm{~K}$, the entropy of pure crystalline…

Identify the correct statements from the following. I. At $0 \mathrm{~K}$, the entropy of pure crystalline materials approach zero. II. Entropy for the process, $\mathrm{H}_2 \mathrm{O}(\mathrm{l}) \longrightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g})$ decreases. III. Gibb's energy is a state function.
  1. I, II, III
  2. I, III
  3. II, III
  4. I, II

Solution

At $0 \mathrm{~K}$, the entropy of pure crystalline materials is zero. $\therefore$ The statement (I) is correct as entropy approach zero, at absolute zero. Statement (II) entropy for the process, $\mathrm{H}_2 \mathrm{O}(l) \longrightarrow \mathrm{H}_2 \mathrm{O}(\mathrm{g})$ decreases is incorrect as entropy increases. The degree of randomness when water vaporises to gaseous state increases. (III) Gibbs' energy is a state function is correct as the Gibbs' free energy depends on initial and final state only. Hence, statement (I) and (III) are correct.

Asked in: AP EAMCET 2022 (05 Jul Shift 1)

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