1.

When FeCl_3 solution is added to NaOH a negatively charged sol is obtained. It is due to the

Answer»

Presence of basic group
Preferential adsorption of `OH^–` ions
Self dissociation
Electron capture by sol particles

Solution :`FeCl_2+3NaOH to Fe(OH)_3+3NaCl`
`NAOH to Na^(+) +OH^(-)`
`OH^(–)` ions having SIMILARITY with `Fe(OH)_3` will be adsorbed on the SURFACE of `Fe(OH)_3` to FORM an electrical double layer
`Fe(OH)_3 |:(OH^(-)),(OH^(-)),(OH^(-)):||:(Na^(+)),(Na^(+)),(Na^(+)):|`


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