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(C) In chromatography,the $R_f$ (retardation factor) value is defined as the ratio of the distance traveled by the substance to the distance traveled

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$R_f$ of a polar compound is smaller than that of a non-polar compound.

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(C) In chromatography,the $R_f$ (retardation factor) value is defined as the ratio of the distance traveled by the substance to the distance traveled by the solvent front. Polar compounds interact more strongly with the stationary phase (e.g.,silica gel),causing them to move slower and resulting in a smaller $R_f$ value. Non-polar compounds interact less with the stationary phase and move faster,resulting in a larger $R_f$ value. Therefore,the $R_f$ of a polar compound is smaller than that of a non-polar compound.

The correct statements among the following,for a chromatography purification method is:

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