Answer:
Cr
Explanation:
Cr goes from +3 to +6 and when it increases it means is being oxidized.
The element being oxidized in the redox reaction is Cr. Oxidation state helps to determine the amount of oxidation which an atom undergoes. An increase in oxidation state or number signifies oxidation has taken place.
A decrease in oxidation state depicts reduction has taken place. In this
scenario, the element Cr has a change in oxidation state from +3 to +6 which
signifies oxidation took place in the atoms of the element. This is why Cr will
be the right option.
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