Change of orange color of chromium(VI) to green color of chromium(III) indicates presence of a:

reducing agent

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oxidizing agent

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reagent

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drying agent

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Solution

The correct option is B reducing agent
Change of orange color of chromium(VI) to green color of chromium(III) indicates presence of a reducing agent. Since the oxidation number of Cr decreases from VI to III, it is reduced. This requires presence of a reducing agent.

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