Question

In preparing a chromatogram, the following precautions are taken.

The solvent front must not be allowed to reach the top of the chromatogrraph paper.

• A. True
• B. False

Answer 1

The correct option is A True

While carrying out chromatography, it is important to monitor that the solvent front does not reach the top of the chromatograph paper. This is because, if the solvent reaches the top of the paper, it wont be possible to measure the distance from the start to the front of the solvent and hence determine the $R_f$ value