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If the bond dissociation energies of XY,...

If the bond dissociation energies of `XY`,`X_2` and `Y_2`(all diatomic molecules)are in the ratio of `1:1:0.5` and `Delta_fH` for the formation of `XY` is `-200kJ` `mol^(-1)`.The bond dissociation energy of `X_2` will be

A

100kJ `mol ^(-1)`

B

800kJ `mol ^(-1)`

C

`300kJ` `mol ^(-1)`

D

`400kJ` `mol ^(-1)`

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The correct Answer is:
B
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