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(a) In a polar solvenbt , PCl_(5) undergoes an ionization reaction as follows :2 PCl_(5)hArrPCl_(4)^(+) + PCl_(6) ^(-) Wht will be the geometrical shape of each species present In the equalilbrium maxture ? (b) Why doesPCl_(5) exist as[ PCl_(4)]^(+) [PCl_(6)]^(-) ?

Answer» <html><body><p></p>Solution :`X = (1)/(2) [{{:(" NO of valence electrons "),("of the central atom "):}}+{{:(" NO of monovalent atoms/group "),("surrounding the central atom "):}}]` <br/> `- {{:("Charge on the cation if the given "),(" <a href="https://interviewquestions.tuteehub.com/tag/species-650011" style="font-weight:bold;" target="_blank" title="Click to know more about SPECIES">SPECIES</a> is a polyatomic cation "):}}+{{:(" Charge on the anion if the given "),(" species is a polyatomic anion"):}}` <br/>For `PCl_(5), X = (1)/(2) [5 + 5] - 0 + 0 = 5(sp^(3) d ,`bipyramidal) <br/> For`PCl_(4_^(+) , X = (1)/(2) [ 5 + 4 - 1 + 0 ] = 4 (sp^(3), `tetrahedra) <br/> For ` PCl_(6) ^(-), X = (1)/(2) [ 5 + 6 - 0 + 1] = 6 (sp^(3) d^(2)` , octahedral)<br/> (<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a>) ` PCl_(5)` has <a href="https://interviewquestions.tuteehub.com/tag/different-951434" style="font-weight:bold;" target="_blank" title="Click to know more about DIFFERENT">DIFFERENT</a> axial and equatorial bohnd lengths and <a href="https://interviewquestions.tuteehub.com/tag/therefore-706901" style="font-weight:bold;" target="_blank" title="Click to know more about THEREFORE">THEREFORE</a> , has an unsymmetrical structure<br/> Which is not stable . By dissociation, it changes into tetrahedral ` ([PCl_(4)]^(+)` and octahedral`[PCl_(6)]^(-)` Which are stable .</body></html>


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