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BITSAT 2020
Exam
BITSAT
Year
2020
Subject
Chemistry
Chapter
Thermodynamics (C)

BITSAT 2020 · Chemistry · Thermodynamics (C)

For which one of the processes represented by the following...

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)\mathrm{Cl}^{-}(\mathrm{g})+\mathrm{aq} \rightarrow \mathrm{Cl}^{-}(\mathrm{aq})
  2. BCl(g)→Cl+(g)+\mathrme−\mathrm{Cl}(\mathrm{g}) \rightarrow \mathrm{Cl}^{+}(\mathrm{g})+\mathrme^{-}
  3. C1/2Cl2(g)→Cl(g)1 / 2 \mathrm{Cl}_{2}(\mathrm{ g}) \rightarrow \mathrm{Cl}(\mathrm{g})
  4. DCl2(l)→Cl2(g)\mathrm{Cl}_{2}(\mathrm{l}) \rightarrow \mathrm{Cl}_{2}(\mathrm{ g})

Correct answer

A. Cl−(g)+aq→Cl−(aq)\mathrm{Cl}^{-}(\mathrm{g})+\mathrm{aq} \rightarrow \mathrm{Cl}^{-}(\mathrm{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)\mathrm{Cl}^{-}(\mathrm{g})+\mathrm{aq} \rightarrow \mathrm{Cl}^{-}(\mathrm{aq}) is such reaction
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