Select the correct statement(s) comparing lyophilic and lyophobic sols.

AA lyophilic sol can be regenerated by adding the solvent to the dried residue.
BLyophobic sols are stabilised mainly by the charge on the particles.
CLyophilic sols are coagulated by a lower concentration of electrolyte than lyophobic sols.
DGold sol is a lyophilic sol.

Answer: A, B

Lyophilic sols are reversible, so statement 1 is correct. Lyophobic sols depend mainly on charge, so statement 2 is correct. Lyophilic sols are more stable and need more electrolyte (statement 3 is wrong), and gold sol is lyophobic (statement 4 is wrong).

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