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BITSAT2020ChemistryThermodynamics (C)Actual

For which one of the processes represented by the following equations the enthalpy (heat) change is likely to be negative

Options

  1. ACl ⁻( g )+ aq Cl ⁻( aq )
  2. BCl ( g ) Cl ⁺( g )+ e ⁻
  3. C1 / 2 Cl ₂( ~g ) Cl ( g )
  4. DCl ₂( l ) Cl ₂( ~g )

Correct answer

A. Cl ⁻( g )+ aq Cl ⁻( aq )

Step-by-step solution

Gaseous ions, when dissolved in water, get hydrated and heat is evolved (heat of hydration). Cl ⁻( g )+ aq Cl ⁻( aq ) is such reaction

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