Q25 of 50 Page 1

Is the variability in oxidation number of transition elements different from that of non – transition elements? Illustrate with examples.

In transition elements the oxidation state can vary from +1 to the highest oxidation state by the removal of all the electrons in the valence orbitals and hence the oxidation state vary by +1. The example of this is Cu+ to Cu+2.

In non-transition elements the oxidation state can vary in the range of +2 and example of this Pb+2 to Pb+4.


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Give reasons:

(a) d- block elements exhibit more oxidation states than f-block elements.


(b) Orange solution of potassium dichromate turns yellow on adding sodium hydroxide to it.


(c) Zirconium (Z= 40) and Hafnium (Z = 72) have almost similar atomic radii.

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