1.

Two compounds have the empirical formula Cr(NH_(3))_(3)(NO_(2)_(3) In aqueous solution,one of these conducts electricity while the other does not. Deduce their probable structures

Answer»

Solution :The compound which CONDUCTS electricity means it GIVES ions in aq. solution. Keeping in view the six co-ordination number of chromium and assuming that the `H_(2)O` molecules enter into the co-ordination sphere, its possible structure can be one of the following:`[Cr(NH_(3))_(3)(NO_(2)2H_(2)O] NO_(2)`
(ii) `(Cr(NH_(3))_(3)NO_(2)(H_(2)O)_(2)](NO_(2))_(2)`
(iii) `[Cr(NH_(3))_(3)(H_(2)O)_(3)](NO_(2))_(3)`
The compound which does not conduct electricity means it does not give ions in solution. Hence, it is neutral or uncharged complex. Its structure may be written as `[Cr(NH_(3))_(3)(NO_(2))_(3)]`


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