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AIIMS 2003
Exam
AIIMS
Year
2003
Subject
Chemistry
Chapter
Thermodynamics (C)

AIIMS 2003 · Chemistry · Thermodynamics (C)

Which one of the following has Δ S^ greater than zero?

Which one of the following has ΔS∘\Delta S^{\circ} greater than zero?

Options

  1. ACaO\mathrm{CaO}(s)+CO2(s)+\mathrm{CO}_2(g)⇌CaCO3(g) \rightleftharpoons \mathrm{CaCO}_3(s)(s)
  2. BNaCl(aq)⇌NaCl(s)\mathrm{NaCl}_{(a q)} \rightleftharpoons \mathrm{NaCl}_{(s)}
  3. CNaNO3(s)⇌Na(aq)++NO3−(aq)\mathrm{NaNO}_{3(s)} \rightleftharpoons \mathrm{Na}_{(a q)}^{+}+\mathrm{NO}_3^{-}{ }_{(a q)}
  4. DN2(g)+3H2( g)⇌2NH3(g)\mathrm{N}_{2(g)}+3 \mathrm{H}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{NH}_{3(g)}

Correct answer

C. NaNO3(s)⇌Na(aq)++NO3−(aq)\mathrm{NaNO}_{3(s)} \rightleftharpoons \mathrm{Na}_{(a q)}^{+}+\mathrm{NO}_3^{-}{ }_{(a q)}

Step-by-step solution

Here, the number of product species is greater than the number of reactant species. So it leads to positive value of entropy.
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