1. Tardigrade
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  3. Chemistry
  4. Assertion: Bond dissociation energy is F2 > Cl2. Reason: Cl2 has more electronic repulsion than F2.

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Q. Assertion: Bond dissociation energy is $F_2 > Cl_2$.
Reason: $Cl_2$ has more electronic repulsion than $F_2$.

AIIMSAIIMS 2013The p-Block Elements - Part2

Solution:

Bond dissociation energy is $F _{2}< Cl _{2}$ because of relatively large electron-electron repulsion among the lone pairs in $F _{2}$ molecule where they are much closer to each other than in $Cl _{2}$