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Aqueous solution of (P) and (Q) are violet. (P) turns green on oxidatioin while (Q) turns green on reduciton. They may respectively be:
A. `VCl_(2),CrO_(3)`
B. `VCl_(3),KMnO_(4)`
C. `VSO_(4),KMnO_(4)`
D. `VOSO_(4),K_(2)MnO_(4)`

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