Q21 of 53 Page 234

How would you account for the following:

The d1 configuration is very unstable in ions.

The d1 electron can be easily lost after the loss of ns electrons. Therefore, the elements having d1 configuration undergo disproportionation reactions.


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21

How would you account for the following:

Of the d4 species, Cr2+ is strongly reducing while manganese (III) is strongly oxidizing.

 21

How would you account for the following:

Cobalt(II) is stable in aqueous solution but in the presence of complexing reagents, it is easily oxidized.

 22

What is meant by ‘disproportionation’? Give two examples of disproportionation reaction in aqueous solution.

 23

Which metal in the first series of transition metals exhibits +1 oxidation state most frequently and why?