A) 9
B) 5
C) 6
D) 8
Correct Answer: B
Solution :
| [b] [a] Amongst hexahalides of sulphur, only \[S{{F}_{6}}\] is exceptionally stable for steric reason. In \[SC{{l}_{6}},\] smaller S cannot accommodate six larger \[C{{l}^{-}}\] ions. |
| [b] \[P{{H}_{5}}\] does not exist as there is large difference in the energies of s, p and d orbital's of P and hence it does not undergo\[s{{p}^{3}}d\] hybridization. |
| [c] \[NC{{l}_{5}}\] does not exist as there is no d-orbtial with N. |
| [d] \[BF_{6}^{3-}\] does not exist as there is no vacant d-orbital in B and hence it cannot exceed its covalency beyond four. |
| (e) Oxygen cannot exceed its covalency as it does not have d-orbital. |
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