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The bond dissociation energies of X(2) ,...

The bond dissociation energies of `X_(2) , Y_(2) ` and XY are in the ratio of `1 : 0.5 : 1` . `Delta H` for the formation of XY is `-200 kJ * mol^(-1)` . The bond dissociation energy of `X_(2)` is -

A

`800 kJ * mol^(-1)`

B

100 `kJ * mol^(-1)`

C

200 `kJ * mol^(-1)`

D

400 `kJ * mol^(-1)`

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