InterviewSolution
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InterviewSolution
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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 does ` PCl_(5)` exist as ` [ PCl_(4)]^(+) [PCl_(6)]^(-)` ? |
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Answer» `X = (1)/(2) [{{:(" NO of valence electrons "),(" of the central atom "):}}+{{:(" NO of monovalent atoms/group "),(" surrounding the central atom "):}}]` `- {{:("Charge on the cation if the given "),(" species is a polyatomic cation "):}}+{{:(" Charge on the anion if the given "),(" species is a polyatomic anion"):}}` For `PCl_(5), X = (1)/(2) [5 + 5] - 0 + 0 = 5 (sp^(3) d ,`bipyramidal) For `PCl_(4_^(+) , X = (1)/(2) [ 5 + 4 - 1 + 0 ] = 4 (sp^(3), `tetrahedra) For ` PCl_(6) ^(-), X = (1)/(2) [ 5 + 6 - 0 + 1] = 6 (sp^(3) d^(2)` , octahedral) (b) ` PCl_(5)` has different axial and equatorial bohnd lengths and therefore , has an unsymmetrical structure Which is not stable . By dissociation, it changes into tetrahedral ` ([PCl_(4)]^(+)` and octahedral `[PCl_(6)]^(-)` Which are stable . |
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