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AIIMS 2013
Exam
AIIMS
Year
2013
Subject
Chemistry
Chapter
Thermodynamics (C)

AIIMS 2013 · Chemistry · Thermodynamics (C)

Assertion : Bond dissociation energy is F_2>Cl_2 Reason : Cl_2 has...

Assertion : Bond dissociation energy is F2>Cl2\mathrm{F}_2>\mathrm{Cl}_2 Reason : Cl2\mathrm{Cl}_2 has more electronic repulsion than F2\mathrm{F}_2.

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

D. If both assertion and reason are false.

Step-by-step solution

Bond dissociation energy is F2<Cl2\mathrm{F}_2 < \mathrm{Cl}_2 because of relatively large electron-electron repulsion among the lone pairs in F2\mathrm{F}_2 molecule where they are much closer to each other than in Cl2\mathrm{Cl}_2.
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