1.

Which of the following is/are not known? (i) PCl_3 , AsCl_3 , SbCl_3 , NCl_5,PCl_5,BiCl_5

Answer»

Solution :(i) `NCl_5` is not known because of the absence of d-orbitals in nitrogen.
(ii) `BiCl_5`does not exist because `Bi^(5+)` being an oxidising AGENT OXIDISES `Cl^(-)` ion to `Cl_(2)`and `Cl^(-)` ion being a REDUCING agent reduces `Bi^(5+) to Bi^(3+)`


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