A) \[Y{{b}^{2+}}\]
B) \[S{{m}^{4+}}\]
C) \[E{{u}^{4+}}\]
D) \[N{{p}^{4+}}\]
Correct Answer: A
Solution :
All transition element which have +2 oxidation state, can change to +3 oxidation state and act as reducing agent. Therefore, \[Y{{b}^{2+}}\]acts as reducing agent while those having +4 oxidation state tend to change to +3 oxidation state and act as oxidising agents.
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