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B. PHARM. (SEM VIII) THEORY EXAMINATION 2018-19 STANDARDIZATION OF HERBAL DRUGS SECTION A
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B. PHARM. (SEM VIII) THEORY EXAMINATION 2018-19 STANDARDIZATION OF HERBAL DRUGS SECTION A 1. **Brief Questions:** **a. Define Rf value.** - **Rf (Retention Factor) Value:** It is a ratio used in chromatography to represent the relative distance traveled by a substance on a chromatography plate. It is calculated by dividing the distance traveled by the substance by the distance traveled by the solvent front. [ Rf = frac{text{Distance traveled by the solute}}{text{Distance t...
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