JEE Advanced 2025 · Paper 2, Chemistry question 11

Adsorption of phenol from its aqueous solution on to fly ash obeys Freundlich isotherm. At a given temperature, from $10\ \mathrm{mg\,g^{-1}}$ and $16\ \mathrm{mg\,g^{-1}}$ aqueous phenol solutions, the concentrations of adsorbed phenol are measured to be $4\ \mathrm{mg\,g^{-1}}$ and $10\ \mathrm{mg\,g^{-1}}$, respectively. At this temperature, the concentration (in $\mathrm{mg\,g^{-1}}$) of adsorbed phenol from $20\ \mathrm{mg\,g^{-1}}$ aqueous solution of phenol will be _____.

Use: $\log_{10}2 = 0.3$