Exposure of an aqueous solution of which ion to oxygen gas will cause a color change? | Descriptive Chemistry

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Question

Exposure of an aqueous solution of which ion to oxygen gas will cause a color change?

Cr²⁺

✓ Correct

Cr₂O₇ 2-

Fe(C₂O₄)₃ 3-

Fe(CN)₆ 3-

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