Question

What is the correct expression for the Rf (retardation factor) value?

Options

• Distance moved by solvent ÷ distance moved by solute

• Distance moved by solute ÷ distance moved by solvent

• Distance moved by solute × distance moved by solvent

• Distance moved by solvent − distance moved by solute

Answer 1

Distance moved by solute ÷ distance moved by solvent

Explanation: 

Rf is defined as the ratio of the distance travelled by the solute to the distance travelled by the solvent front from the same starting line.