1.

The `H-H` bond energy is `430KJmol^(-1)` and `Cl-Cl` bond energy is `240KJmol^(-1)` . `DeltaH` for `HCl` is `-90KJ` . The `H-Cl` bond energy is aboutA. `425KJmol^(-1)`B. `213KJmol^(-1)`C. `306KJmol^(-1)`D. `180KJmol^(-1)`

Answer» Correct Answer - B
`(1)/(2)H_(2)+(1)/(2)Cl_(2)rarrHCl,DeltaH=-90KJ`
`:. DeltaH=(1)/(2)e_(H-H)+(1)/(2)e_(Cl-Cl)`
or `-90=(1)/(2)xx430+(1)/(2)xx240-e_(H-Cl)`
`:. e_(H-Cl)=425KJmol^(-1)`


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