A metal complex with a formula is involved in spd hybridisation. It upon reaction with excess of solution gives '' moles of AgCl. '' is equal to the number of lone pairs of electron present in centr

Question

A metal complex with a formula  is involved in spd hybridisation. It upon reaction with excess of  solution gives '' moles of AgCl. '' is equal to the number of lone pairs of electron present in central atom of . Then the number of geometrical isomers exhibited by the complex is .

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Strategy:
 Use VSEPR theory to find the lone pairs on the central atom of . Equate this to moles of  precipitated to deduce the coordination formula, then determine its geometric isomers.

Step 1: Finding 'x'
In , Bromine has 7 valence electrons.
It uses 5 electrons to form 5 single bonds with 5 Fluorine atoms.
Remaining electrons = 2 (which constitute 1 lone pair).
Thus, .

Step 2: Deduce the complex formula
The empirical formula is .
Since 1 mole of  precipitates with excess , exactly one  ion

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