1.

PCl_(5) in solid state exists as PCl_(4)^(+) and PCl_(6)^(-) and also in some solvents it undergoes dissociation as 2PCl_(5) hArr PCl_(4)^(+) +PCl_(6)^(-) The geometry and hybridisation of PCl_(6)^(-) is

Answer»

Octahedral , `sp^3`
Octahedral , `sp^3d^2`
TRIGONAL bipyramid `sp^3d`
SEE - saw , `sp^3 d `

SOLUTION :`[PCl_3]^(-)` - No. of HYBRIDE orbitals `=1/2 [5+6-1]=6`


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