JEE MAIN - Chemistry (2021 - 17th March Morning Shift - No. 12)
Given below are two statements :
Statement I : Retardation factor (Rf) can be measured in meter/centimeter.
Statement II : Rf value of a compound remains constant in all solvents.
Choose the most appropriate answer from the options given below :
Statement I : Retardation factor (Rf) can be measured in meter/centimeter.
Statement II : Rf value of a compound remains constant in all solvents.
Choose the most appropriate answer from the options given below :
Statement I is true but statement II is false
Statement I is false but statement II is true
Both statement I and statement II are true
Both statement I and statement II are false
Explanation
Retardation factor (Rf) is the ratio of the distance
moved by the substance from the baseline to the
distance moved by the solvent from the baseline.
So, it is dimensionless. The distance moved by the
substance is due to the adsorption of the substance on
the stationary phase. It does not depend on the
nature of the solvent. But the distance moved by the
solvent will change with the nature of the solvent.
Therefore, Rf will vary with the change in the solvent.
So, both the statements are false.
So, both the statements are false.
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