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  4. The element that usually does not show variable oxidation states is :

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Q. The element that usually does not show variable oxidation states is :

JEE MainJEE Main 2019The d-and f-Block Elements

Solution:

Usally Sc(Scandium) does not show variable oxidation states.
Most common oxidation states of :
(i) Sc : +3
(ii) V : +2, +3, +4, +5
(iii) Ti : +2, +3, +4
(iv) Cu : +1, +2