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Enthalpy

X2 represents...

Question

$X_{2}$ represents halogen molecule. Bond energy of different halogen molecules will lie in following sequences:

F_{2} > {C l}_{2} > {B r}_{2} > I_{2}

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{C l}_{2} > {B r}_{2} > F_{2} > I_{2}

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I_{2} > {C l}_{2} > {B r}_{2} > F_{2}

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{B r}_{2} > F_{2} > I_{2} > {C l}_{2}

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Solution

The correct option is D ${C l}_{2} > {B r}_{2} > F_{2} > I_{2}$
The bond energy of halogen molecule increases with a decrease in bond length,
$F_{2}$ being smaller in size, it has more electron-electron repulsion and its size is greater than $C l_{2} a n d B r_{2}$
so, the decreasing order of halogen molecule as
$C l_{2} > B r_{2} > F_{2} > I_{2}$

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