Given below are two statements:
Statement I : The correct order in terms of bond dissociation enthalpy is 
.
Statement II: The correct trend in the covalent character of the metal halides is 
,
and 
.
In the light of the above statements, choose the correct answer from the options given below:
Text Solution
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Statement I: The bond dissociation enthalpy of halogens follows the order 
. The bond energy of 
is lower than 
and 
due to the high inter-electronic repulsion between the lone pairs on the small fluorine atoms. Thus, Statement I is true.
Statement II: According to Fajan's rules, for a given metal, the compound with the metal in a higher oxidation state has more covalent character due to higher polarizing power. Therefore, 
and 
are correct. However, for Uranium halides, 
has a higher oxidation state (+6) than 
, so 
is more covalent than 
. The statement claims 
, which is incorrect. Thus, Statement II is false.
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