Amongst the following, the strongest oxidizing anion is

Answer: Option D

Option A: $${\text{CrO}}_4^{2-}$$
This is chromate ion, which is a moderately strong oxidizing agent. It can oxidize certain metals and compounds but is not as strong as some other options.

Option B: $${\text{VO}}_4^{3-}$$
This is peroxyvanadate ion, which is a strong oxidizing agent. It contains vanadium in its highest oxidation state, +5, and it has a high affinity for gaining electrons, making it a potent oxidizing agent.

Option C: $${\text{FeO}}_4^{2-}$$
This is ferrate ion, which is also a strong oxidizing agent. It contains iron in its highest oxidation state, +6, and it can oxidize a wide range of substances.

Option D: $${\text{MnO}}_4^{2-}$$
This is permanganate ion, which is a powerful oxidizing agent. It contains manganese in its highest oxidation state, +7, and it is commonly used in various oxidation reactions, such as in the laboratory and in water treatment processes.

So, to correct the record, Option D, $${\text{MnO}}_4^{2-}$$