JEE MAIN - Chemistry (2019 - 11th January Morning Slot - No. 6)
The element that usually does NOT show variable oxidation states is :
V
Cu
Sc
ti
Explanation
Sc3+ has noble gas configuration hence only +3 exists.
Most common oxidation states of :
(i) Sc : +3
(ii) V : +2, +3, +4, +5
(iii) Ti : +2, +3, +4
(iv) Cu : +1, +2
Most common oxidation states of :
(i) Sc : +3
(ii) V : +2, +3, +4, +5
(iii) Ti : +2, +3, +4
(iv) Cu : +1, +2
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