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Thermodynamics — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics1 Mark
MCQ
Which one of the following reaction has $\Delta\text{S}^\circ$ greater than zero?
  • A
    $\text{CaO}+\text{CO}_2(\text{g})\rightleftharpoons \text{CaCO}_3(\text{s})$
  • B
    $\text{NaCl(aq)}\rightleftharpoons \text{NaCl(s)}$
  • ✓
    $\text{NaNO}_3(\text{s})\rightleftharpoons \text{Na}^+(\text{aq})+\text{NO}_3^-(\text{sq})$
  • D
    $\text{N}_2(\text{g})+3\text{H}_2(\text{g})\rightleftharpoons 2\text{NH}_3(\text{g})$
✓

Answer

Correct option: C.
$\text{NaNO}_3(\text{s})\rightleftharpoons \text{Na}^+(\text{aq})+\text{NO}_3^-(\text{sq})$
$\text{NaNO}_3(\text{s})\rightleftharpoons \text{Na}^+(\text{aq})+\text{NO}_3^-(\text{sq})$
Reaction has $\Delta\text{S}^\circ > 0.$ This is because, in this reaction the compound breaks up into its respective ions resulting in increase in randomness and thus entropy.

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