1.

Which one of the following arrangementdoes not truly represent the propertyindicated againstit ?

Answer»

`Br_(2) lt Cl_(2)lt F_(2)` Oxidising power
`Br_(2) lt Cl_(2) lt F_(2)` Electronegativity
`Br_(2) lt F_(2) lt Cl_(2)` Electron affinity
`Br_(2) lt Cl_(2)lt F_(2)` Bondenergy

Solution :Shond dissociation enthalphy of halogen follows the sequnecy as
`Cl_(2) gt Br gt F_(2) gt I_(2)`
Enthalpy of dissociation decreasss as the bond distance increases from `F_(2)` to `I_(2)` due to a correspondingincreases in size of the atom as one MOVE down the group from F to i. HOWEVER, the F.F bond dissociation enthalpy is smaller than that of `Cl-Cl` (even than that of Br-Br) because repulsion between the lons pairs of electrons are very LARGE.


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