On adding few drops of dil` Hcl` or `FeCl_3` to freshly precipitated ferric hydroxide , a red
Channel: Doubtnut
Date: 2020-08-02

On adding few drops of dil` Hcl` or `FeCl_3` to freshly precipitated ferric hydroxide , a red coloured clloidal solution is obtained . This phenomenon is known as :