1.

Bismuth is a strong oxidising agent in the pentavalent state. Or Pentavalent bismuth is a strong oxidising agent.

Answer»

Solution :Since the inert pair effect is very prominent in BI, THEREFORE, its +5 oxidation state is much LESS stable than its +3 oxidation state. In other words, BISMUTH in the pentavalent state can easily accept two electrons and thus gets reduced to more stable trivalent bismuth.
`Bi^(5+) + 2 e^(-) rarr Bi^(3+)`
Therefore, Bi in the pentavalent state acts as a strong oxidising agent.


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