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NEET2007ChemistryThermodynamics (C)Actual

Assertion : As a salt such as ( NaCl ) dissolves, the ( Na ⁺ )and ( 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., ( H ) has a high positive value and (T S ) a low negative value.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

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

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