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  4. The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and substance B from the base line are 3.25 cm .2 .08 cm and 1.05 cm. respectively. The ratio of Rf values of A to B is

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Q. The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance $A$ and substance $B$ from the base line are $3.25\, cm .2 .08\, cm$ and $1.05 \,cm$. respectively. The ratio of $R_f$ values of $A$ to $B$ is ________

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Solution:

$\frac{ R _{ F _{ A }}}{ R _{ F _{ B }}}=\frac{\frac{2.08}{3.25}}{\frac{1.05}{3.25}}=\frac{2.08}{1.05} \simeq 2$