Give reasons When $C l_{2}$ reacts with excess of $F_{2}$ , $C l F_{3}$ is formed and not $F C l_{3}$ .

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Solution

Fluorine shows oxidation state of $+ 1$ only because it has no d orbital. In $C l F_{3}$ , the oxidation state of F is -1 and that of Cl is +3. It is possible. Also, in $C l F_{3}$ , the bigger Cl atom can easily accommodate 3 small sized F atoms but in $F C l_{3}$ , the small sized F atom cannot easily accommodate 3 large sized Cl atoms

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