NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions
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Question : 19
Total: 49
Compare the stability of +2 oxidation state for the elements of the first transition series.
Solution:
The common oxidation state of 3d series elements is + 2 which arisesdue to participation of only 4s electrons. The tendency to show highestoxidation state increases from Sc to Mn, then decreases due to pairing of electrons in 3d subshell. Thus in the series Sc(II) does not exist, Ti(II) isless stable than Ti(IV). At the other end of the series, oxidation state of Znis +2 only.
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