Answer & Solution
Answer: Option D
Solution:
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, $${\text{MnO}}_4^{2 - }$$
