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In thin layer chromatography, a substance moved by a distance of $4 \mathrm{~cm}$, where as the solvent moved by a distance of $5 \mathrm{~cm}$. Then the value of retardation factor $\left(R_f\right)$ is
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$0.8$
$R_f=\frac{\text { distance travelled by solute }}{\text { distance travelled by solvent }}$
$R_f=\frac{4}{5}=0.8$
$R_f=\frac{4}{5}=0.8$
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