Assertion : As a salt such as $\mathrm{NaCl}$ dissolves, the $\mathrm{Na}^{+}$and $\mathrm{Cl}^{-}$ions leaving the crystal lattice acquire far greater freedom. Reason : In thermodyanamic terms, the formation of solution occurs with a favourable change in free energy, i.e., $\Delta H$ has a high positive value and $T \Delta S$ a low negative value.

Question

Assertion : As a salt such as $\mathrm{NaCl}$ dissolves, the $\mathrm{Na}^{+}$and $\mathrm{Cl}^{-}$ions leaving the crystal lattice acquire far greater freedom. Reason : In thermodyanamic terms, the formation of solution occurs with a favourable change in free energy, i.e., $\Delta H$ has a high positive value and $T \Delta S$ a low negative value., If both assertion and reason are true and reason is the correct explanation of assertion., If both assertion and reason are true but reason is not the correct explanation of assertion., If assertion is true but reason is false., If both assertion and reason are false.

MARKS App · Accepted Answer

In thermodynamic terms, formation of solution occurs with a favourable change in free energy $\Delta G=\Delta H-T \Delta S$ where $\Delta H$ has a small positive value and $T \Delta S$ a large positive value; thus $\Delta G$ is negative.

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