Step 1: Understanding colloids.
Colloids are heterogeneous systems where one substance is dispersed in another. Based on affinity between dispersed phase and dispersion medium, colloids are of two types – lyophilic and lyophobic. Step 2: Key differences.
\begin{tabular}{|c|c|c|}
\hline
Property & Lyophilic Colloids & Lyophobic Colloids
\hline
Affinity & High affinity for dispersion medium & Little/no affinity for dispersion medium
\hline
Stability & Very stable & Less stable, easily coagulated
\hline
Reversibility & Reversible sols & Irreversible sols
\hline
Examples & Starch, proteins, gum & Gold sol, sulphur sol, As$_2$S$_3$ sol
\hline
Preparation & Form spontaneously & Need special methods
\hline
\end{tabular}
Conclusion:
Lyophilic colloids are stable and reversible due to high affinity with solvent, while lyophobic colloids are unstable and need stabilizing agents.
