Chromatography is used for the purification of which of the following?

What is $R_f$?

Which purification method is used to separate a volatile liquid from non-volatile impurities?

In chromatography,what does $R_f$ stand for?

Which of the following is the structure of a separating funnel?

Using the given figure,the ratio of $R_f$ values of sample $A$ and sample $C$ is $x \times 10^{-2}$. The value of $x$ is . . . . . . . .
Table: Paper chromatography of Samples
| Component | Distance from base line (cm) |
| :--- | :--- |
| Sample $A$ | $5.0$ |
| Sample $B$ | $6.5$ |
| Sample $C$ | $10.0$ |
| Solvent front | $12.5$ |