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Standard XII

Chemistry

Rate Constant

The decreasin...

Question

The decreasing order of bond dissociation energy among halogens is:

F - F > C l

C l > B

r -

B

> I - I

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C l

C l > B

r -

B

> F - F > I - I

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C l

C l > B

r -

B

> I - I > F - F

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I - I > F - F > C l

C l > B

r -

B

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Solution

The correct option is B $C l$ - $C l > B$ r - $B$ r $> F - F > I - I$
Bond dissociation energy decrease
down the group
But bonds dissociation energy of
$F_{2}$ is less than excepted due to
large repulsion of $e^{-}$ in $F_{2}$

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Q. Arrange the following bonds according to their average bond energies in descending order:

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Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy ) is
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The decreasing order of bond dissociation energy among halogens is:

The correct option is B Cl -Cl>Br - Br >F−F>I−IBond dissociation energy decreasedown the groupBut bonds dissociation energy of F2 is less than excepted due to large repulsion of e− in F2

The correct option is B $C l$ - $C l > B$ r - $B$ r $> F - F > I - I$
Bond dissociation energy decrease
down the group
But bonds dissociation energy of
$F_{2}$ is less than excepted due to
large repulsion of $e^{-}$ in $F_{2}$