Question

Using the provided information in paper chromatography

The calculated $R_f$ value of A is __________ $\times 10^{-1}$.

Hint:

The $R_f$ value is always less than or equal to 1. It is a characteristic property of a compound for a specific solvent-adsorbent pair.

Answer 1

Correct Answer: 4

Step 1: $R_f$ (Retardation factor) $= \frac{\text{Distance moved by the substance}}{\text{Distance moved by the solvent front}}$.
Step 2: $R_f = 2 / 5 = 0.4$.
Step 3: Expressed as $x \times 10^{-1}$, we get $4 \times 10^{-1}$.