Which of the following equations indicates an increase in entropy?

  • A
    $CaO_{(s)} + CO_{2_{(g)}} \longrightarrow CaCO_{3_{(s)}}$
  • B
    $NaCl_{(aq)} \longrightarrow NaCl_{(s)}$
  • C
    $NaNO_{3_{(s)}} \longrightarrow Na^{+}_{(aq)} + NO_{3^{-(aq)}}$
  • D
    $N_{2_{(g)}} + 3H_{2_{(g)}} \longrightarrow 2NH_{3_{(g)}}$

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One mole of water at $100\,^{\circ}C$ is converted into steam at $100\,^{\circ}C$ at a constant pressure of $1\,atm$. The change in entropy is [heat of vaporisation of water at $100\,^{\circ}C = 540\,cal/g$].

The entropy change for the expansion of $2 \, \text{mol}$ of an ideal gas from $2 \, \text{L}$ to $20 \, \text{L}$ at a temperature of $27 \, ^oC$ is ...... $(R = 2 \, \text{cal/mol K})$

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