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| 1. |
How is the variability in oxidation states of transition metals different from that of the non transition metals? Illustrate with examples. |
| Answer» Solution :The characteristic property of transition elements to show variable oxidation state arises out of INCOMPLETELY filld d-orbital in such a way that their oxidation states differ by UNITY Ex: V(II), V(III), V(IV) and V(V). However, in NON transition elements, teh oxidation states differ generally by two. In the r-block elements the lower oxidation states are favoured by higher member because of INERT pair effect while in d-block, higher oxidation states is favoured by higher members of the group. Ex. MO(VI), W(VI) are more stable than Cr(VI). Thus, Cr(VI) act as good oxidizing agent in acidic medium while `MoO_(3) and WO_(3)` are not | |